Lab Final Preparation: Mastering Starfish Biology

An unfertilized starfish egg is commonly referred to as an 'ovum', which is the female reproductive cell. It is before fertilization occurs.

The image depicts a fertilized starfish egg undergoing the first cleavage, a crucial process in embryo development.

Starfish go through various stages in their life cycle before reaching maturity. The 2 cell stage specifically refers to the early development stage of a starfish embryo where it has only two cells.

The correct scientific name for a starfish is Asterias rubens, not bipinna. Echinodermata is the phylum to which starfish belong, and Asteroidea is the class of echinoderms that includes starfish.

The correct developmental stage of a starfish is known as a blastula, which occurs during the early stages of embryonic development.

The correct term for a starfish Brachiolaria larva is Starfish Brachiolaria larva. While the other options refer to different stages of various marine animals, the specific name for this larval stage of a starfish is important to remember.

An early starfish gastrula refers to the stage in the development of a starfish embryo when cells have undergone gastrulation, a process where the cells reorganize and differentiate into three primary germ layers.

A fertilized starfish egg refers to an egg that has been fertilized by sperm and is ready to develop into a new starfish organism. The other options provided are either incorrect in terms of type of egg or different sea creatures.

Late gastrula and bipinnaria larva are specific stages in the development of certain marine invertebrates like sea stars and sea urchins.

The pigmented cortex refers to a region of the brain that contains pigmented cells that play a role in various functions such as vision and motor control.

In biology, number 2 refers to a Blastacoel, which is a primitive body cavity found in some animals belonging to the phylum Porifera (sponges). The other options listed are not related to the specific term for number 2 in biology.

The number 3 typically refers to the area of gray crescent in this context, so options like circumference of a circle, volume of a sphere, and perimeter of a rectangle are incorrect as they represent different geometric properties.

In cell biology, the number 4 is typically referred to as 'nuclei', which are membrane-bound organelles containing the cell's chromosomes.

The vitelline membrane surrounds the egg yolk and provides support and protection to the developing embryo. It is not involved in regulating sperm entry, nutrient transportation, or placenta formation.

Shrinkage spaces are the spaces that are intentionally left between cast iron pipes after pouring molten lead. These spaces allow for the shrinkage of the lead as it cools and solidifies, ensuring a tight and watertight joint between the pipes.

Blastomeres are the cells formed by the cleavage of a fertilized egg, which eventually give rise to tissues and organs in the developing embryo. The other options mentioned do not represent the early stage cell division process in embryonic development.

In human embryonic development, the ectoderm is one of the three primary germ layers that give rise to the various tissues and organs of the body. It eventually forms structures such as the skin, nervous system, and hair.

During embryonic development, the inner cell mass gives rise to the endoderm, which is one of the three primary germ layers. The ectoderm forms the skin and nervous system, the mesoderm contributes to the muscles and bones, while the hypoderm refers to the subcutaneous tissue beneath the skin.

Number 1 is typically used to represent the inner ectodermal layer within the context of tissue layers.

In the context of tissue layers, the outer ectodermal layer is commonly referred to as Number 2, while the inner mesodermal layer and middle endodermal layer are different layers. The surrounding peritoneum is not directly related to the ectodermal layer.

In the process of gastrulation during embryonic development, the germ layers are formed in a specific order - endoderm, mesoderm, and ectoderm. The epidermis is the outermost layer of skin and is not part of the germ cell layers.

In embryonic development, Number 4 represents the direction of epiboly, which is the process of cell movement during gastrulation where cells spread to cover the yolk surface. The other options do not accurately describe the role or significance of Number 4 in the developmental process.

The dorsal blastoporal lip is a specific region in embryology, which plays a crucial role in the gastrulation process.

In embryology, number 6 is often referred to as the blastopore, which is the opening of the central cavity of an embryo in the early stage of development. Gastrula, neurula, and morula are other key stages in embryonic development but do not specifically refer to number 6.

Number 7 in anatomy refers to the gastrocoel, which is a cavity in the developing embryo that eventually forms the digestive system.

The blastocoel is the fluid-filled cavity in a blastula, which is an early stage of embryonic development in animals. The centrosome is an organelle involved in cell division, the nucleolus is a structure within the nucleus involved in ribosome production, and peroxisomes are organelles involved in various metabolic functions.

Number 9 in anatomy specifically refers to yolk filled endodermal cells, which play a significant role in the development of certain organisms.

In embryology, the archenteron roof refers to a specific anatomical structure related to the developing digestive system in a multicellular organism.

In the development of the human body, number 2 refers to the outer ectodermal layer, which gives rise to structures like the skin, nails, and hair.

Number 3 in embryology refers to the inner ectodermal layer, which is one of the germ layers formed during early development.