Learn About Human Embryology Quiz Questions
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The paraxial mesoderm is "segmented" into 40 "_____"
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Explore the fundamentals of human embryonic development in this quiz, covering conception, ovulation, and embryological stages.
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- 2.
An organelle that develops over the anterior half of the head in the spermatozoa
Explanation
The acrosome is an organelle that forms over the anterior half of the head in spermatozoa. It plays a crucial role in fertilization by containing enzymes that help the sperm penetrate the outer layer of the egg. The acrosome is essential for successful fertilization as it allows the sperm to release its genetic material into the egg.Rate this question:
- 3.
A bipolar molecule that reduces surface tension of water
Explanation
A surfactant is a molecule that is bipolar, meaning it has both a hydrophilic (water-loving) and a hydrophobic (water-repelling) end. This property allows surfactants to reduce the surface tension of water by disrupting the cohesive forces between water molecules at the surface. By doing so, surfactants enable substances that are not normally soluble in water to mix with it, making them useful in various applications such as cleaning agents, emulsifiers, and foaming agents.Rate this question:
- 4.
There are how many parts of blastocyst?
Explanation
A blastocyst is a structure formed during the early development of an embryo. It consists of two main parts: an inner cell mass and an outer layer of cells called the trophoblast. The inner cell mass will eventually develop into the fetus, while the trophoblast will form the placenta. Therefore, the correct answer is 2.Rate this question:
- 5.
There are ___ left lung lobes
Explanation
The statement "There are 2 left lung lobes" indicates that there are two lobes in the left lung.Rate this question:
- 6.
Most important feature of week 3?
Explanation
Gastrulation is the process in embryonic development where the cells of the blastula rearrange themselves into three distinct layers, namely the ectoderm, mesoderm, and endoderm. This process is crucial as it marks the formation of the basic body plan of an organism. Gastrulation leads to the development of various important structures and organs in the body, such as the nervous system, muscles, and internal organs. Therefore, it can be considered as the most important feature of week 3 in embryonic development.Rate this question:
- 7.
There are ___ right lung lobes
Explanation
The correct answer is 3 because the right lung is divided into three lobes: the superior, middle, and inferior lobes. Each lobe has its own function and is responsible for different respiratory processes. The division of the lung into lobes allows for efficient oxygen exchange and helps in maintaining proper respiratory function.Rate this question:
- 8.
Is a fringe of tissue near the ovary leading to the Fallopian tube
Explanation
Fimbriae are a fringe of tissue near the ovary that lead to the Fallopian tube. These finger-like projections help to capture the released egg from the ovary and guide it into the Fallopian tube for fertilization. Fimbriae play a crucial role in the reproductive system by facilitating the movement of the egg and ensuring its successful journey towards the uterus.Rate this question:
- 9.
Hypoblast migrates laterally and ventrally as the lining of the
Explanation
The hypoblast, which is the innermost layer of the blastocyst, migrates laterally and ventrally to form the lining of the yolk sac. The yolk sac is an extraembryonic membrane that plays a crucial role in early embryonic development. It provides nutrients to the developing embryo and also contributes to the formation of the primitive gut. The migration of the hypoblast is an important step in the formation and development of the yolk sac.Rate this question:
- 10.
Bilaminar disc consists 2 layers including
Explanation
The bilaminar disc is the structure formed during embryonic development and consists of two layers: the epiblast and the hypoblast. The epiblast is the upper layer and gives rise to the three primary germ layers of the embryo, which eventually develop into various tissues and organs. The hypoblast is the lower layer and contributes to the formation of the yolk sac. Together, these two layers play a crucial role in the early stages of embryogenesis.Rate this question:
- 11.
_____ diffuse from the glands and capillaries to the developing blastocyst
Explanation
Nutrients diffuse from the glands and capillaries to the developing blastocyst. This is because the developing blastocyst requires essential nutrients for its growth and development. The glands and capillaries in the surrounding tissues release these nutrients, which then passively move across the concentration gradient into the blastocyst. This process ensures that the blastocyst receives the necessary nourishment to continue its development into an embryo.Rate this question:
- 12.
The functional unites of the bronchopulmonary segments are small air-filled sacs called
Explanation
The bronchopulmonary segments are functional units of the lungs, and they contain small air-filled sacs called alveoli. These alveoli are responsible for the exchange of oxygen and carbon dioxide during respiration. They have thin walls and a large surface area, which allows for efficient gas exchange between the lungs and the bloodstream. The alveoli play a crucial role in ensuring that oxygen is delivered to the body's tissues and that carbon dioxide is removed.Rate this question:
- 13.
Endoderm is formed from the
Explanation
The correct answer is "Epiblast." During embryonic development, the epiblast is one of the two layers of cells in the early embryo. It gives rise to the three primary germ layers, including the endoderm. The endoderm is the innermost germ layer that forms the lining of various organs and structures in the body, such as the digestive tract, respiratory system, and glands. Therefore, the endoderm is formed from the epiblast during embryonic development.Rate this question:
- 14.
Weeks 9-38 - Viability, increasein size; development of external genitalia
Explanation
The given answer "Fetus" is correct because it accurately describes the stage of development that occurs between weeks 9-38. During this time, the embryo undergoes significant changes and is referred to as a fetus. The fetus becomes viable, meaning it has the potential to survive outside the womb, and it also increases in size. Additionally, the development of external genitalia is a notable milestone during this stage.Rate this question:
- 15.
Viability normally develops when the fetus weight ____ gm
Explanation
Viability normally develops when the fetus weight reaches 500 grams.Rate this question:
- 16.
Follicular cells from ovary is called
Explanation
The correct answer is "Corona Radiata." The term "Corona Radiata" refers to the layer of cells that surround the oocyte (egg) within the ovarian follicle. These follicular cells are responsible for providing nourishment and support to the developing oocyte. The corona radiata also plays a crucial role in the fertilization process as it helps guide the sperm towards the oocyte during ovulation.Rate this question:
- 17.
During fertilization Ovulation of egg means "picked up" by _____ of uterine tube
Explanation
During fertilization, the ovulation of the egg refers to the process where the egg is released from the ovary. After ovulation, the egg is "picked up" by the fimbriae, which are finger-like projections located at the end of the uterine tube. The fimbriae create a gentle sweeping motion to help guide the egg into the tube, where it can potentially be fertilized by sperm. Therefore, the correct answer is fimbriae.Rate this question:
- 18.
Cellular Trophoblast, the _____ is the outer later, prior to implantation beginning
Explanation
The cytotrophoblast is the outer layer of the cellular trophoblast before implantation begins. This layer plays a crucial role in the formation of the placenta and is responsible for providing nutrients to the developing embryo. It also helps in the invasion of the embryo into the uterine wall during implantation. The cytotrophoblast is a dynamic layer that undergoes changes and differentiation as pregnancy progresses.Rate this question:
- 19.
Viability, increasein size; development of external genitalia
Explanation
The term "fetus" refers to the stage of prenatal development after the embryo stage and before birth. During this stage, the fetus continues to grow and increase in size. It also undergoes various developmental changes, including the development of external genitalia. Therefore, the given answer correctly identifies the term "fetus" as the stage of development that involves viability, increase in size, and the development of external genitalia.Rate this question:
- 20.
Is the waxy or cheese-like white substance found coating the skin of newborn humans
Explanation
Vernix caseosa is the waxy or cheese-like white substance found coating the skin of newborn humans. It is composed of sebum, dead skin cells, and lanugo hair. This substance acts as a protective barrier for the baby's delicate skin, preventing it from becoming dehydrated in the amniotic fluid. It also has antimicrobial properties, helping to protect the baby from infections. Vernix caseosa is usually absorbed into the baby's skin within a few days after birth, but its presence at birth indicates that the baby was born at full term.Rate this question:
- 21.
Is fine, downy hair
Explanation
Lanugo refers to the fine, downy hair that covers the body of a developing fetus. This hair is usually shed before birth, but in some cases, it may persist after birth. Lanugo is more commonly seen in premature babies, who may have this hair on their shoulders, back, and forehead. It serves as insulation for the developing fetus and helps regulate their body temperature.Rate this question:
- 22.
What week do lung become functional?
Explanation
The correct answer is 26 or 26th. This suggests that the lungs become functional during the 26th week of development. This is a crucial milestone in fetal development as it marks the point at which the lungs are capable of supporting breathing and gas exchange. Prior to this week, the lungs are not fully developed and are not able to function independently.Rate this question:
- 23.
Type ____ Cells produce 'Surfactant'
- 24.
An eggshell-like covering is called
Explanation
Zona pellucida is a term used to describe an eggshell-like covering that surrounds the oocyte (immature egg) in mammals. It is a thick, transparent glycoprotein layer that plays a crucial role in fertilization. The zona pellucida acts as a barrier, preventing multiple sperm from entering the egg and ensuring that only one sperm can penetrate and fertilize it. It also provides structural support to the developing embryo before implantation in the uterus.Rate this question:
- 25.
Nucleus of a sperm or an egg cell is called
Explanation
The nucleus of a sperm or an egg cell is called pronuclei. This term refers to the nuclei of the gametes before they fuse during fertilization. Each gamete contains half of the genetic material required to form a complete organism, and the pronuclei combine to form a zygote with a complete set of chromosomes. The pronuclei eventually merge, resulting in the formation of a diploid nucleus in the zygote, which will then develop into an embryo.Rate this question:
- 26.
Embryo at an early stage of embryonic development is called
Explanation
An embryo at an early stage of embryonic development is called a morula. This stage occurs after the fertilization of an egg and the formation of a zygote. During this stage, the zygote undergoes multiple rounds of cell division, resulting in a solid ball of cells called a morula. The morula eventually develops into a blastocyst, which is the next stage of embryonic development.Rate this question:
- 27.
Cellular ______, the cytotrophoblast is the outer later, prior to implantation beginning
Explanation
In cellular development, the trophoblast is the outer layer of cells that forms during the early stages of implantation. It plays a crucial role in the formation of the placenta and is responsible for nutrient absorption and waste elimination between the mother and the developing embryo. The cytotrophoblast specifically refers to the inner layer of the trophoblast before it differentiates into the syncytiotrophoblast, which is responsible for invading the uterine wall.Rate this question:
- 28.
All other tissues are
- 29.
The fluid-filled cavity that surrounds the developing embryo
Explanation
The amniotic cavity is the fluid-filled space that surrounds and protects the developing embryo during pregnancy. It is formed by the amnion, a membrane that develops from cells of the embryo. The amniotic fluid within the cavity provides cushioning and support for the growing fetus, allowing it to move and develop properly. The amniotic cavity also acts as a barrier, protecting the embryo from external shocks and infections.Rate this question:
- 30.
The most important event of week 4?
- 31.
Fertilization is completed how many hours after ejaculation?
Explanation
Fertilization is completed 24 hours after ejaculation. This means that after ejaculation, it takes approximately 24 hours for the sperm to reach and fertilize the egg. During this time, the sperm travels through the female reproductive system and eventually reaches the fallopian tubes where fertilization occurs.Rate this question:
- 32.
The _______ is "segmented" into 40 "somites"
Explanation
The paraxial mesoderm is a layer of embryonic tissue that is segmented into 40 somites. Somites are blocks of tissue that form along the sides of the developing embryo and give rise to important structures such as the vertebrae, ribs, and muscles. The segmentation of the paraxial mesoderm into somites is a crucial step in the development of the body plan and the formation of the musculoskeletal system.Rate this question:
- 33.
Crosses the placental blood barrier, and development abnormalities.
Explanation
A teratogen is a substance or agent that can cause abnormalities in the development of a fetus when it crosses the placental blood barrier. The given answer states that the substance crosses the placental blood barrier and causes development abnormalities, which aligns with the definition of a teratogen.Rate this question:
- 34.
The directed degradation (digestion) of proteins
Explanation
Proteolytic refers to the process of breaking down proteins through digestion. This term is commonly used to describe the directed degradation of proteins, where specific enzymes called proteases break down proteins into smaller peptides or amino acids. This process is essential for various biological functions, including protein turnover, regulation of cellular processes, and nutrient absorption.Rate this question:
- 35.
______ migrates laterally and ventrally as the lining of the Yolk Sac
Explanation
The hypoblast is the correct answer because it is the layer of cells that migrates laterally and ventrally to form the lining of the Yolk Sac. The Yolk Sac is an extraembryonic membrane that provides nutrients to the developing embryo. The hypoblast plays a crucial role in early embryonic development, as it contributes to the formation of important structures such as the endoderm and the primitive gut.Rate this question:
- 36.
_____ secret nutrients such as sugars and amino acids
Explanation
Endometrial glands secrete nutrients such as sugars and amino acids. These glands are found in the endometrium, which is the inner lining of the uterus. During the menstrual cycle, the endometrium thickens in preparation for potential pregnancy. If fertilization occurs, the endometrial glands continue to secrete nutrients to support the developing embryo. If fertilization does not occur, the endometrial lining is shed during menstruation. The secretion of nutrients by endometrial glands is important for the nourishment and development of the embryo in the early stages of pregnancy.Rate this question:
- 37.
Amniotic cavity is continuous with?
Explanation
The amniotic cavity is continuous with the ectoderm. The ectoderm is one of the three primary germ layers of the developing embryo, and it gives rise to various structures including the epidermis, nervous system, and sensory organs. The amniotic cavity is a fluid-filled sac that surrounds and protects the developing embryo, providing a stable environment for its growth and development. The continuity between the amniotic cavity and the ectoderm allows for the exchange of nutrients and waste products, as well as the proper development of the ectodermal structures.Rate this question:
- 38.
Extra-embryonic
Explanation
The term "extra-embryonic" refers to structures or tissues that are outside of the developing embryo itself. The trophoblast is a specific type of cell layer that forms during early embryonic development and is part of the extra-embryonic structures. It plays a crucial role in implantation of the embryo into the uterus and later develops into the placenta. Therefore, the trophoblast is the correct answer as it is directly related to the concept of extra-embryonic development.Rate this question:
- 39.
Eggs or oocytes are formed in the Yolk sac during week 4, and a week later they migrate into the
Explanation
During week 4 of development, eggs or oocytes are formed in the yolk sac. These eggs then migrate into the gonads, which are the reproductive organs responsible for producing gametes (eggs or sperm). The correct answer is "Gonads, gonad."Rate this question:
- 40.
Result of fertilization?
Explanation
After fertilization, the sperm and egg fuse to form a zygote. The zygote is formed by the combination of two haploid gametes, resulting in a diploid zygote with a complete set of chromosomes. Therefore, the zygote is 2n (diploid) and consists of a single cell.Rate this question:
- 41.
Bilaminar disc evolved from
Explanation
The bilaminar disc is a structure that forms during early embryonic development. It consists of two layers, the epiblast and the hypoblast. The epiblast gives rise to the embryo itself, while the hypoblast contributes to the formation of extraembryonic tissues. The embryoblast, also known as the inner cell mass, is a group of cells within the blastocyst that will eventually give rise to the embryo. Therefore, it can be concluded that the bilaminar disc evolves from the embryoblast.Rate this question:
- 42.
_____ is formed from the epiblast
Explanation
The endoderm is formed from the epiblast during embryonic development. The epiblast is one of the two layers of cells in the early embryo, and it gives rise to all three germ layers: ectoderm, mesoderm, and endoderm. The endoderm specifically forms the innermost layer of cells in the embryo, which eventually develops into various organs and tissues such as the lining of the digestive tract, respiratory system, liver, and pancreas. Therefore, the correct answer is endoderm.Rate this question:
- 43.
What forms during week 2?
Explanation
During week 2 of embryonic development, the bilaminar disc forms. The bilaminar disc is a structure that consists of two layers: the epiblast and the hypoblast. The epiblast layer gives rise to the three primary germ layers, which are essential for the formation of all tissues and organs in the body. The hypoblast layer plays a role in the development of the yolk sac. Together, these two layers form the bilaminar disc, which is a crucial stage in the early development of the embryo.Rate this question:
- 44.
The second differentiated tissue?
Explanation
The second differentiated tissue is the ectoderm, which originates from the epiblast. During embryonic development, the epiblast gives rise to three primary germ layers: ectoderm, mesoderm, and endoderm. The ectoderm is the outermost layer and contributes to the formation of various structures such as the skin, nervous system, and sensory organs. It differentiates into specialized cell types like neurons, skin cells, and hair follicles. Therefore, the correct answer is ectoderm, from epiblast.Rate this question:
- 45.
Gastrulation is a formation of
Explanation
Gastrulation is a crucial process in embryonic development where the three primary germ layers, namely ectoderm, mesoderm, and endoderm, are formed. The correct answer, mesoderm, is one of these germ layers. It gives rise to various structures such as muscle, bone, connective tissue, and the circulatory system. During gastrulation, cells in the embryo undergo extensive rearrangement and migration to establish these germ layers, and the mesoderm is specifically responsible for the development of these important structures in the body.Rate this question:
- 46.
The sperm must penetrate through?
Explanation
The sperm must penetrate through the corona radiata and zona pellucida in order to reach and fertilize the egg. The corona radiata is a layer of cells surrounding the egg, while the zona pellucida is a thick glycoprotein layer that surrounds the egg and acts as a barrier. The sperm must first penetrate the corona radiata and then bind to and penetrate the zona pellucida in order to reach the egg and fertilize it.Rate this question:
- 47.
The system that began developing first is the
Explanation
The nervous system is the system in the body that began developing first. It is responsible for transmitting signals between different parts of the body, allowing for communication and coordination. The development of the nervous system is crucial for the functioning of other systems and organs in the body. It plays a vital role in controlling bodily functions, responding to stimuli, and regulating behavior. As one of the earliest systems to develop, the nervous system sets the foundation for the growth and functioning of the rest of the body.Rate this question:
- 48.
Fertilization is the fusion of
Explanation
Fertilization is the process in which the male and female pronuclei, which contain the genetic material from each parent, fuse together. This fusion combines the genetic information from both parents and forms a zygote, which will develop into a new individual.Rate this question:
- 49.
Weeks 1-2 - Fertilization, Cleavage, Migration and Implantation, formation of bilaminar disc
Explanation
The term "pre-embryo" refers to the early stage of development after fertilization but before the formation of the bilaminar disc. During this stage, the fertilized egg undergoes cleavage, where it divides into multiple cells, and then migrates and implants into the uterine wall. The formation of the bilaminar disc, which consists of two layers of cells, marks the next stage of embryonic development. Therefore, the term "pre-embryo" accurately describes the developmental stage mentioned in the given information.Rate this question:
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