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Each red blood cell is shaped as a biconcave disk

 Each red blood cell is shaped as a biconcave disk. This allows it to

A) change its shape to squeeze through narrow openings.

B) shrink or swell slightly in response to osmotic conditions.

C) synthesize new proteins and membrane components readily.

D) change its shape to squeeze through narrow openings and shrink or swell slightly in response to osmotic conditions.

E) change its shape to squeeze through narrow openings, shrink or swell slightly in response to osmotic conditions, and synthesize new proteins and membrane components readily.

32) Excess iron in the body is

A) stored in bones.

B) eliminated in the feces.

C) stored in fatty tissues.

D) found in white blood cells.

E) All of the answers are correct.

33) The carrier protein that transports absorbed iron through the blood is

A) hemoglobin.

B) transferrin.

C) erythropoietin.

D) thrombopoietin.

E) intrinsic factor.

34) Which of the following is/are vasoconstrictors?

A) platelet-activating factor

B) serotonin

C) adenosine diphosphate

D) thromboxane A2

E) serotonin and thromboxane A2

35) Which of the following are the two anticoagulants produced by the body?

A) heparin and plasmin

B) antithrombin III and heparin

C) antithrombin III and plasmin

D) tissue plasminogen activator and plasmin

E) protacyclin and heparin

36) Platelets function in

A) transporting chemicals important for clotting.

B) forming temporary patches in injured areas.

C) contraction after clot formation.

D) initiating the clotting process.

E) All of the answers are correct.

37) Platelets are

A) large cells that lack a nucleus.

B) small cells that lack a nucleus.

C) large cells with a prominent, indented nucleus.

D) small cells with a many-shaped nucleus.

E) fragments of large cells.

38) The extrinsic pathway of coagulation is activated by the

A) sticking of platelets to damaged tissue.

B) activation of a proenzyme exposed to collagen.

C) release of tissue factor by a damaged endothelium.

D) release of heparin from the liver.

E) conversion of prothrombin to thrombin.

39) The intrinsic pathway of coagulation is activated by the

A) sticking of platelets to damaged tissue.

B) activation of proenzyme exposed to collagen.

C) release of tissue factor by a damaged endothelium.

D) release of heparin from the liver.

E) conversion of prothrombin to thrombin.

40) The common pathway of coagulation begins with the

A) sticking of platelets to damaged tissue.

B) activation of a proenzyme exposed to collagen.

C) release of tissue factor by a damaged endothelium.

D) activating of a clotting factor that converts prothrombin to thrombin.

E) activation of a clotting factor that converts fibrinogen to fibrin.

Dec 11 2019 View more View Less

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