Blood Questions - Human Physiology PDF

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Example exam questions for the Blood Unit, posted by Dr. Das...

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Practice questions on BLOOD (Physiology 2014-2015):

Saswati Das

Here are some samples of MCQs to evaluate your understanding of lectures on blood. 1. Which of the following statements about red blood cells (RBCs) is correct? a. RBCs contain hemoglobin b. Mature RBCs lack nuclei c. Mature RBCs lack ribosomes d. The lifespan of RBCs is about 30 days e. All are correct except d. 2. Which dietary component is needed for the synthesis of DNA and influences the production of RBCs? a. Calcium b. Iron c. Vitamin A d. Folic acid e. Vitamin D 3. Which of the following statements about the destruction of RBCS is not correct? a. Iron is transported to the bone marrow by a protein called transferrin. b. Bilirubin impart color to the bile. c. Macrophages in the liver and spleen destroy old and damaged RBCs. d. Biliverdin is recycled to the bone marrow. e. The globin part of hemoglobin is broken down to amino acids. 4. A person who has greater-than normal number of eosinophils is most likely suffering from: a. anemia b. polycythemia c. an allergy or intestinal parasites d. infectious bacteria e. a virus infection 5. The biconcave shape of RBCs is beneficial because it: a. increases the ratio of cell surface area to volume of the cell and allows for increased diffusion of oxygen b. makes the RBCS more flexible so they can pass and bend through the smaller blood vessels more easily. c. allows more space for the mature RBCs to accommodate the nucleus. d. prevents diapedesis of RBCs through the walls of the blood capillaries. e. Both a. and b. are correct

6. What percentage of the body weight (in kg) is composed of blood? What percentage of this blood is composed of plasma? a. 20%; 55 % b. 20%; 45% c. 7%; 45% d. 7%; 55% e. < 1%; < 1% 7. Which of the following conditions can stimulate erythropoietin secretion? a. Low levels of oxygen in blood. b. Normal levels of hemoglobin in RBCs c. A high RBC count d. An increased blood flow through the kidneys e. None of the above. 8. Which of the following blood components is not correctly matched with its function?

Blood component

Function

a

erythrocytes

oxygen transport

b

platelets

hemostasis

c

B lymphocytes

synthesis of antibodies

d

fibrinogen

dissolution of blood clots

e

macrophages

phagocytosis

9. The term _______________ refers to production of blood cells in the _______ of adults. a. hemolysis; spleen b. hemostasis; liver c. homeostasis; bone marrow d. hematopoiesis; bone marrow e. hematopoiesis; yolk sac

10. All of the following facts about macrophages are correct except: a. They are efficient phagocytes that are found in tissue spaces b. They can recognize bacteria by using their pattern recognition receptors c. They present foreign antigens on major histocompatibility II (MHC II) complex molecules d. They originate in the blood as monocytes e. They can only express foreign antigens on MHC I complex molecules

11. Here are three statements about blood coagulation. Are these statements correct or not correct? i) Thrombin catalyzes the conversion of fibrin to fibrinogen ii) Coagulation can occur in the absence of calcium both in vivo and in vitro iii) Tissue factor normally initiates coagulation in vivo.

(i)

(ii)

(iii)

a

Not correct

Not correct

Not correct

b

Correct

Correct

Not correct

c

Not correct

Not correct

Correct

d

Correct

Correct

Correct

e

Not correct

Correct

Not correct

12. During platelet plug formation _________ and ________ are released, causing more platelets to stick to the platelet plug. a. b. c. d. e.

prostacyclin; nitric oxide heparin; plasmin ADP; thromboxane GTP ; nitric oxide antithrombin; tissue plasminogen activator

13. What is serum? It is: a. b. c. d. e.

whole blood sample from which all cells are removed plasma from which fibrinogen and clotting factors are removed the portion of the blood that is composed of red blood cells plasma from which only albumin and globulins are removed. plasma from which only ionized calcium is removed

14. Which of the following is correct for a person with Type A blood? The person: a. can safely donate blood to a person with type O blood group b. can safely donate blood to a person with type AB blood group c. must have anti-A antibodies in his plasma d. must be a Rh positive person e. has neither anti A or anti B antibodies in his/her plasma

Answers 1=e; 2=d; 3=d; 4=c; 5=e; 6=d; 7=a; 8=d; 9=d; 10=e; 11=c; 12=c; 13=b; 14=b...