Q. No.Branch of aorta that supplies the oxygenated blood to the muscles of the heart is:
1. coronary arteries.
2. common carotid arteries.
3. coronary sinus.
4. great cardiac veins.
1. coronary arteries.
2. common carotid arteries.
3. coronary sinus.
4. great cardiac veins.
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Identify the incorrect statement regarding the hepatic portal system:
1. It includes two capillary beds separated by a portal vein.
2. The first capillary bed picks up nutrients from the liver.
3. The second capillary bed delivers nutrients to the liver.
4. Blood leaving the hepatic portal vein flows into the second capillary bed.
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What factor is responsible for the movement of the blood in the vascular system?
1. valves in the walls of the blood vessels.
2. peristalsis caused by the smooth muscle in the blood vessel walls.
3. pressure gradients created by the heart.
4. osmotic pressure.
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Venous return to the heart would be increased when there is:
1. dilation of the veins.
2. loss of the venous valves.
3. increased skeletal muscle activity.
4. decreased respiratory rate
Which of these pressures pulls water into capillaries?
1. blood hydrostatic pressure
2. blood colloid osmotic pressure
3. interstitial fluid pressure
4. interstitial colloid osmotic pressure
How would the medullary cardiovascular center respond if the blood pressure is increased?
1. increasing the heart rate.
2. sending sympathetic signals to the myocardial cells.
3. increasing cardiac output.
4. causing vasodilation
The regulation of blood pressure is regulated by:
1. hypothalamus
2. medulla oblongata
3. cerebellum
4. pons
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What is true regarding the papillary muscles found in the ventricles?
1. They are attached to chordae tendineae.
2. They contract to close the foramen ovale.
3. They are attached to the semilunar valves.
4. They surround the openings of the coronary arteries.
Action potentials pass from one cardiac muscle cell to another
1. through gap junctions.
2. by a special cardiac nervous system.
3. because of the large voltage of the action potentials.
4. because of the plateau phase of the action potentials.
5. by neurotransmitters.
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Electrical relay station, slowing the electrical current sent by the sinoatrial (SA) node before the signal is permitted to pass down through to the ventricles, is/are:
| 1. bundle branches | 2. Purkinje fibers |
| 3. AV node | 4. AV bundle |
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