Question

1. Matured ______________ are the most numerous cells and do not have a nucleus.
   1. erythrocytes
   2. leukocytes
   3. platelets

2. Three types of formed elements found in blood include erythrocytes, leukocytes, and ______________.
   1. WBC
   2. RBC
   3. Platelets

3. ____________ drain tissues and return blood to the heart.
   1. Arteries
   2. Veins
   3. Valves

4. Located in the lower limb, the ____________ is the longest vein in the body.
   1. external iliac
   2. internal iliac
   3. great saphenous

5. The function of the _____________ is to drain the digestive viscera and carry dissolved nutrients to the liver for processing.
   1. fetal circulation
   2. hepatic portal circulation
   3. pulmonary circulation system

6. The __________ veins drain the liver.
   1. renal
   2. hepatic
   3. pulmonary

7. Veins draining the head and upper extremities empty into the ___________ vena cava.
   1. superior
   2. inferior
   3. master

8. The ______________ is the space within the blood vessels that holds the blood.
   1. intima
   2. lumen
   3. external

9. The largest branch of the abdominal aorta, the _____________ artery, supplies most of the small intestine and first half of the large intestine.
   1. superior mesenteric
   2. superior phrenics
   3. mediastinal

10. The _____________ is the largest artery of the body.
    1. aorta
    2. carotid artery
    3. femoral artery

11. What is micturition?

Answer 1

Q1. Matured erythrocyte are the most numerous cells and do not have nucleus, because, mature erythrocyte or RBC are synthesized through erythropoiesis. Mature RBC is produce from the reticulocyte (precoursor cell) which is devoid of nucleus. RBC also don't have nucleus, ribosome, mitochondria, so it couldn't synthesize haemoglobin. The count of erythrocyte (RBC) in adult male is 5.5 million/mm3 and in adult female 4.8 million/mm3. This count is higher than any others cells in the blood. So erythrocyte is most numerous and don't have nucleus. Option A is correct.

Option B is incorrect because, White blood cells or leukocytes are nucleated cells. The leukocyte are classified as granulocyte and agranulocyte. Neutrophils, Eosinophils, Basophils are granulocyte which mean their cytoplasm contain granule and Lymphocyte, Monocytes are the agranulocyte which mean they don't have any granule in their cytoplasm. But both have nucleus in their body. The count of WBC is less than RBC, The total leukocyte count of an adult is 4000-11000 /mm3 of blood. So leukocyte is not most numerous cells of blood and it has nucleus.

Option C is incorrect because, Platelets are the most small cells in the blood. Nucleus is absent in platelets, so it can't reproduce. The average count of platelets is 2.5 lac/mm3. So platelets are less in number than erythrocyte, so it is not the numerous cell among others.