1.2

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Compared to an artery, the wall of a vein differs in which of the following ways: A)it contains smooth muscle B)it consists of three layers C)the middle layer is thin D)the outer layer is composed largely of collagen fibers E)it is lined by a thin layer of endothelium

C

A decrease in venous return to the heart causes: A)a decrease in stroke volume and a decrease in cardiac output B)a decrease in stroke volume and an increase in cardiac output C)an increase in stroke volume and an increase in cardiac output D)an increase in stroke volume and a decrease in cardiac output E)no change in stroke volume and no change in cardiac output

A

Which is the correct sequence going from the outermost to the innermost layer of a blood vessel wall: A)tunica media, tunica intima, tunica externa B)tunica media, tunica externa, tunica intima C)tunica externa, tunica media, tunica intima D)tunica externa, tunica intima, tunica media E)tunica intima, tunica media, tunica externa

C

The carotid artery is located in the: A)axilla B)groin C)neck D)abdomen E)leg

C

The renal veins empty blood into the: A)kidneys B)common iliac vein C)inferior vena cava D)hepatic portal vein E)vertebral vein

C

The umbilical vein carries: A)metabolic wastes and carbon dioxide from the fetus to the placenta B)metabolic wastes and carbon dioxide from the placenta to the fetus C)oxygen and foods from the fetus to the placenta D)oxygen and foods from the placenta to the fetus E)blood from the navel into the inferior vena cava

D

In which of the following blood vessels is the blood pressure the highest: A)veins B)capillaries C)vena cava D)arteries E)arterioles

D

Peripheral resistance is increased by: A)dilation of a blood vessel B)atherosclerosis C)a decrease in blood viscosity D)an increase in blood pressure E)an increase in heart rate

B

Vasoconstriction occurs as a result of: A)an increase in parasympathetic nervous system firing B)a decrease in parasympathetic nervous system firing C)an increase in sympathetic nervous system firing D)a decrease in sympathetic nervous system firing E)an increase in blood pressure

C

Which of the following is the function of renin and aldosterone: A)they are produced whenever blood pressure rises and ultimately cause an increase in blood volume and blood pressure B)they are produced whenever blood pressure rises and ultimately cause a decrease in blood volume and blood pressure C)they are produced when blood pressure rises and have no long-term effect on blood volume and blood pressure D)they are produced whenever blood pressure falls and ultimately cause an increase in blood volume and blood pressure E)they are produced whenever blood pressure falls and ultimately cause a decrease in blood volume and blood pressure

D

Substances tend to leave the bloodstream at the arterial end of the capillary because: A)the osmotic pressure of the blood is higher at the arterial end of the capillary B)the osmotic pressure of the blood is higher at the venous end of the capillary C)blood pressure is higher at the arterial end of the capillary D)blood pressure is higher at the venous end of the capillary E)interstitial pressure is higher at the arterial end of the capillary

C

Varicose veins are caused by: A)a loss of elasticity in blood vessels B)the accumulation of fatty substances in blood vessels C)excessive production of the enzyme renin D)incompetent valves E)orthostatic hypotension

D

The heart is enclosed by a double sac of serous membrane known as the peritoneum.

F

The pulmonary arteries carry deoxygenated blood to the lungs.

T

The aorta is the largest artery within the pulmonary circulation.

F

Arteries always carry blood away from the heart.

T

The part of the intrinsic conduction system of the heart that directly supplies the walls of the ventricles is the Purkinje fibers.

T

The pacemaker of the heart is called the sinoatrial (SA) node.

T

Systole means contraction of heart muscle.

T

Low venous return decreases stroke volume and cardiac output.

T

An increase in parasympathetic nervous system firing causes cardiac output to increase.

F

The smooth muscle in a blood vessel wall is found in the tunica media.

T

Abnormal or unusual heart sounds are called angina.

F

The foramen ovale and the ductus venosus shunt blood away from the nonfunctional and collapsed fetal lungs.

F

An increase in blood vessel diameter causes blood pressure to decrease.

T

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