Histology Midterm Blood Questions Maktbt Hamed

The correct answer is b. They are true cells that contain nucleus and organelles. This statement is false because erythrocytes, also known as red blood cells, do not contain a nucleus or organelles. They are specialized cells that are responsible for carrying oxygen to the body's tissues. Their lack of a nucleus and organelles allows for more space to carry oxygen and gives them their characteristic biconcave shape.

Neutrophils are a type of granular leukocytes that increase in acute pyogenic infections and contain azurophilic granules. However, their nuclei are not horse-shoe shaped. Instead, neutrophils have multi-lobed nuclei, with two to five lobes connected by thin threads of chromatin.

Mature red blood corpuscles, also known as red blood cells or erythrocytes, are not considered as true cells that contain nuclei and cell organelles. They are unique in that they lack a nucleus and most organelles, allowing them to carry oxygen more efficiently. This absence of a nucleus and organelles also gives them their characteristic biconcave shape, allowing them to squeeze through narrow capillaries and maximize their surface area for gas exchange. They can also adhere to one another, forming a rouleaux appearance.

Blood platelets are actually the smallest blood elements, not the largest. They are tiny, disc-shaped fragments of cells that are involved in blood clotting. They do not contain a central granulomere, but they do contain a peripheral hyalomere. Therefore, the correct answer is that blood platelets are not the largest blood elements.

The statement "Their increase in number is called Leucopenia" is false. Leucopenia refers to a decrease in the number of white blood cells, not an increase. An increase in the number of white blood cells is known as leukocytosis.

Neutrophil leucocytes are a type of white blood cells that play a crucial role in the immune response. They contain azurophilic and specific granules, which are involved in various defense mechanisms. Neutrophils are phagocytic cells, meaning they can engulf and destroy pathogens by secreting proteolytic enzymes. Moreover, their numbers increase during acute infections as they are recruited to the site of infection to combat the invading microorganisms. However, neutrophils do not possess a horse shoe-shaped nucleus.

Platelets are actually small, irregularly shaped cell fragments that are derived from the fragmentation of megakaryocytes in the bone marrow. They play a crucial role in blood coagulation, helping to form clots to prevent excessive bleeding. The normal range for the number of platelets in the blood is between 200,000 and 400,000 per microliter. However, their size is typically much smaller, ranging from 1 to 3 micrometers in diameter. Therefore, the statement that their size is 8-12 Um is false.

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Eosinophil leucocytes are a type of granular leucocytes that contain segmented horse-shoe nucleus. They are not larger in diameter than blood monocytes. Monocytes are larger in size compared to eosinophils. Eosinophils are primarily involved in the immune response against parasitic infections and allergic reactions, rather than the removal of histamine.

During erythropoiesis, which is the process of red blood cell formation, several changes occur in the cells. The nucleus disappears, the size of cells decreases, and the cytoplasm changes to acidophilic. However, specific granules do not appear in the cytoplasm during erythropoiesis.

Reticulocytes are immature red blood cells that are slightly larger than mature red blood cells. They are stained with brilliant cresyl blue and contain basophilic reticulum of polysomes. However, it is false to say that they constitute 7-10% of the circulating blood. The correct percentage of reticulocytes in the circulating blood is much lower.

Bone marrow is a soft, spongy tissue found inside bones that is responsible for producing various types of blood cells. Stem cells are found in the bone marrow and are responsible for generating new blood cells. Fat cells, macrophages, and plasma cells are also found in the bone marrow. However, plasma blasts are not typically found in the bone marrow. Plasma blasts are immature plasma cells that are usually found in lymphoid tissues, such as the lymph nodes or spleen, where they develop into mature plasma cells.

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Basophilic leucocytes are a type of white blood cells that secrete eosinophil chemotactic factor. This means that they release a substance that attracts eosinophils, another type of white blood cell, to the site of infection or inflammation. This helps in recruiting eosinophils to the area where they are needed for immune response. Basophilic leucocytes do not have large retractile acidophilic granules, a segmented lobulated nucleus, or account for 20% of the circulating WBCs.

Normoblasts are immature red blood cells that are still in the process of maturing. They have a round nucleus that is usually centrally located, not eccentric. They are also filled with hemoglobin, as they are developing into mature red blood cells. Normoblasts have basophilic cytoplasm, meaning that their cytoplasm stains blue with basic dyes. This is a characteristic feature of normoblasts and helps to distinguish them from other types of cells. Normoblasts are normally found in the bone marrow and are not typically present in circulating blood.