20.11: Review Questions

3.

The endothelium is found in the ________.

1. tunica intima
2. tunica media
3. tunica externa
4. lumen

4.

Nervi vasorum control ________.

1. vasoconstriction
2. vasodilation
3. capillary permeability
4. both vasoconstriction and vasodilation

5.

Closer to the heart, arteries would be expected to have a higher percentage of ________.

1. endothelium
2. smooth muscle fibers
3. elastic fibers
4. collagenous fibers

6.

Which of the following best describes veins?

1. thick walled, small lumens, low pressure, lack valves
2. thin walled, large lumens, low pressure, have valves
3. thin walled, small lumens, high pressure, have valves
4. thick walled, large lumens, high pressure, lack valves

7.

An especially leaky type of capillary found in the liver and certain other tissues is called a ________.

1. capillary bed
2. fenestrated capillary
3. sinusoid capillary
4. metarteriole

8.

In a blood pressure measurement of 110/70, the number 70 is the ________.

1. systolic pressure
2. diastolic pressure
3. pulse pressure
4. mean arterial pressure

9.

A healthy elastic artery ________.

1. is compliant
2. reduces blood flow
3. is a resistance artery
4. has a thin wall and irregular lumen

10.

Which of the following statements is true?

1. The longer the vessel, the lower the resistance and the greater the flow.
2. As blood volume decreases, blood pressure and blood flow also decrease.
3. Increased viscosity increases blood flow.
4. All of the above are true.

11.

Slight vasodilation in an arteriole prompts a ________.

1. slight increase in resistance
2. huge increase in resistance
3. slight decrease in resistance
4. huge decrease in resistance

12.

Venoconstriction increases which of the following?

1. blood pressure within the vein
2. blood flow within the vein
3. return of blood to the heart
4. all of the above

13.

Hydrostatic pressure is ________.

1. greater than colloid osmotic pressure at the venous end of the capillary bed
2. the pressure exerted by fluid in an enclosed space
3. about zero at the midpoint of a capillary bed
4. all of the above

14.

Net filtration pressure is calculated by ________.

1. adding the capillary hydrostatic pressure to the interstitial fluid hydrostatic pressure
2. subtracting the fluid drained by the lymphatic vessels from the total fluid in the interstitial fluid
3. adding the blood colloid osmotic pressure to the capillary hydrostatic pressure
4. subtracting the blood colloid osmotic pressure from the capillary hydrostatic pressure

15.

Which of the following statements is true?

1. In one day, more fluid exits the capillary through filtration than enters through reabsorption.
2. In one day, approximately 35 mm of blood are filtered and 7 mm are reabsorbed.
3. In one day, the capillaries of the lymphatic system absorb about 20.4 liters of fluid.
4. None of the above are true.

16.

Clusters of neurons in the medulla oblongata that regulate blood pressure are known collectively as ________.

1. baroreceptors
2. angioreceptors
3. the cardiomotor mechanism
4. the cardiovascular center

17.

In the renin-angiotensin-aldosterone mechanism, ________.

1. decreased blood pressure prompts the release of renin from the liver
2. aldosterone prompts increased urine output
3. aldosterone prompts the kidneys to reabsorb sodium
4. all of the above

18.

In the myogenic response, ________.

1. muscle contraction promotes venous return to the heart
2. ventricular contraction strength is decreased
3. vascular smooth muscle responds to stretch
4. endothelins dilate muscular arteries

19.

A form of circulatory shock common in young children with severe diarrhea or vomiting is ________.

1. hypovolemic shock
2. anaphylactic shock
3. obstructive shock
4. hemorrhagic shock

20.

The coronary arteries branch off of the ________.

1. aortic valve
2. ascending aorta
3. aortic arch
4. thoracic aorta

21.

Which of the following statements is true?

1. The left and right common carotid arteries both branch off of the brachiocephalic trunk.
2. The brachial artery is the distal branch of the axillary artery.
3. The radial and ulnar arteries join to form the palmar arch.
4. All of the above are true.

22.

Arteries serving the stomach, pancreas, and liver all branch from the ________.

1. superior mesenteric artery
2. inferior mesenteric artery
3. celiac trunk
4. splenic artery

23.

The right and left brachiocephalic veins ________.

1. drain blood from the right and left internal jugular veins
2. drain blood from the right and left subclavian veins
3. drain into the superior vena cava
4. all of the above are true

24.

The hepatic portal system delivers blood from the digestive organs to the ________.

1. liver
2. hypothalamus
3. spleen
4. left atrium

25.

Blood islands are ________.

1. clusters of blood-filtering cells in the placenta
2. masses of pluripotent stem cells scattered throughout the fetal bone marrow
3. vascular tubes that give rise to the embryonic tubular heart
4. masses of developing blood vessels and formed elements scattered throughout the embryonic disc

26.

Which of the following statements is true?

1. Two umbilical veins carry oxygen-depleted blood from the fetal circulation to the placenta.
2. One umbilical vein carries oxygen-rich blood from the placenta to the fetal heart.
3. Two umbilical arteries carry oxygen-depleted blood to the fetal lungs.
4. None of the above are true.

27.

The ductus venosus is a shunt that allows ________.

1. fetal blood to flow from the right atrium to the left atrium
2. fetal blood to flow from the right ventricle to the left ventricle
3. most freshly oxygenated blood to flow into the fetal heart
4. most oxygen-depleted fetal blood to flow directly into the fetal pulmonary trunk