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has a diameter of about 15 - 20 µm.

differentiates into a promyelocyte.

arises from a hemocytoblast.

arises from the myelocyte.

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is 40-50% in a healthy man.

is a numerical value indicating the amount of hemoglobin in the erythrocyte in picograms (pg).

can be altered by pathological conditions such as inflammation, and sometimes by physiological conditions such as pregnancy.

expresses the volume ratio of formed blood elements in the blood.

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Eosinophilic granulocytes

have a nucleus consisting of two segments that are connected by a chromatin bridge, which may resemble the shape of eyeglasses (spectacle shaped nucleus).

have deep blue granules.

are multiplied, e.g. in allergic patients and patients with parasitic diseases.

form 3-5% of peripheral blood leukocytes.

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Hematopoiesis takes place in an adult human

in the yolk sac.

in myeloid tissue in the bone marrow and in lymphoid tissue in the lymph nodes or spleen.

in the medulla of the thymus.

in the renal cortex and liver.

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Basophilic granulocytes

constitute 0.5-1% of leukocytes in the peripheral circulation.

contain basophilic, blue-staining granules that are larger than those of other granulocytes.

are precursors of tissue macrophages.

have a spherical unsegmented nucleus.

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Which statement/s is/are correct about prenatal hematopoiesis?

It occurs in the first trimester mainly in the bone marrow as medullary hematopoiesis.

One of its phases takes place in the liver and spleen primordium.

The first phase takes place in the yolk sac of the embryo.

The lymphopoiesis lineage takes place in the thymus, among others.

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are selected and mature in the thymus.

some of them become memory cells after activation.

can be distinguished from B-lymphocytes by the type of surface CD markers (cluster of differentiation) in the membrane.

participate in cellular immunity.

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Ossification of the long bones

involves the penetration of vascular buds with osteogenic cells into the cartilage.

usually takes place on the basis of a cartilaginous model.

gives rise to permanent Haversian systems (osteons) upon completion.

contains a zone where chondrocytes first hypertrophy and then degrade.

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Bone is a specialized connective tissue containing cells

osteoblasts, which are responsible for bone formation.

osteocytes, whose numerous processes penetrate microscopic channels.

osteoclasts, which are responsible for the resorption of bone tissue.

odontoblasts, which produce bone matrix.

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is involved in bone degradation.

is derived from the mesenchyme.

is involved in secondary ossification.

has an eosinophilic cytoplasm.

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