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Which of the following animals has a single circuit of blood flow and two heart chambers?


A) squirrel
B) salmon
C) snake
D) salamander

Correct Answer

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How long do human red blood cells circulate in the blood before they wear out and have to be replaced?


A) 3 to 4 months
B) 1 to 2 weeks
C) 1 month
D) 10 to 12 months

Correct Answer

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Blood clots are formed by platelets and the plasma protein


A) thrombin.
B) fibrinogen.
C) hemophilin.
D) sealin.

Correct Answer

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Which of the following is characteristic of the circulatory system of arthropods?


A) lack of a heart
B) lack of distinction between blood and interstitial fluid
C) lack of blood vessels.
D) lack of blood

Correct Answer

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The largest blood vessel in the human body is the


A) aorta.
B) vena cava.
C) arteria maxima.
D) pulmonary artery.

Correct Answer

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In which of the following human blood vessels is the blood pressure lowest?


A) veins in the head
B) arterioles in the legs
C) capillaries in the feet
D) arteries in the head

Correct Answer

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Blood flow through capillaries is controlled by


A) precapillary sphincters only.
B) precapillary sphincters and smooth muscle in the walls of arterioles.
C) one- way valves.
D) smooth muscle in the walls of arterioles only.

Correct Answer

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Cells make up about what percentage of total blood volume?


A) 80%
B) 25%
C) 10%
D) 45%

Correct Answer

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What is the most common cause of anemia?


A) low blood pressure
B) iron deficiency
C) inefficient hemoglobin production
D) vitamin deficiency

Correct Answer

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What type of blood vessel is solely responsible for exchange between the blood and the interstitial fluid?


A) capillary
B) venule
C) arteriole
D) artery

Correct Answer

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The diameter of a capillary is about the same as that of


A) a venule.
B) a nerve.
C) a red blood cell.
D) an arteriole.

Correct Answer

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Which of the following animals has a three- chambered heart?


A) bird
B) crocodile
C) human
D) snake

Correct Answer

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Which of these statements about erythrocytes is true?


A) Erythrocytes in adult humans have nuclei.
B) The main function of erythrocytes is to carry nutrients.
C) Erythrocytes are shaped like biconcave disks.
D) Each erythrocyte contains about 1 million molecules of hemoglobin.

Correct Answer

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Adaptation to terrestrial life required major evolutionary changes.The change from gill breathing to lung breathing was accompanied by important changes in the


A) association of blood and interstitial fluid.
B) manufacture of blood cells.
C) cardiovascular system.
D) reproductive system.

Correct Answer

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Which kind of vessel has the lowest blood velocity?


A) artery
B) venule
C) capillary
D) vein

Correct Answer

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