Q. No.How can adrenaline have different effects on blood vessels - vasodilation in skeletal muscle but vasoconstriction in the skin?
1. sympathetic fibers secrete epinephrine in the muscle and acetylcholine in the skin
2. bradykinin stimulates constriction of arterioles in the dermis
3. the muscles have cholinergic sympathetic fibers and the skin has adrenergic fibers
4. the muscle arterioles and the skin arterioles have different types of receptors for adrenaline
1. sympathetic fibers secrete epinephrine in the muscle and acetylcholine in the skin
2. bradykinin stimulates constriction of arterioles in the dermis
3. the muscles have cholinergic sympathetic fibers and the skin has adrenergic fibers
4. the muscle arterioles and the skin arterioles have different types of receptors for adrenaline
In most normal people [not trained athletes] the increase in cardiac output is due mainly to:
1. increase in stroke volume
2. decrease in ejection fraction
3. decrease in end-diastolic volume
4. increase in heart rate
Severe dyspnea due to pulmonary edema will be caused most likely by:
1. cardiogenic shock
2. anaphylactic shock
3. right-sided congestive heart failure
4. left-sided congestive heart failure
The average life span of human red blood cells is:
| 1. | 10 days | 2. | 120 days |
| 3. | 21 days | 4. | three months |
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In the early fetal life the main site for red blood cell formation is:
1. bone marrow
2. kidney
3. liver
4. spleen
Tissue death (necrosis) due to inadequate blood supply to the affected area, such as the heart, is:
| 1. coronary thrombosis | 2. angina pectoris |
| 3. ischemia | 4. infarction |
A chest pain or pressure, usually due to not enough blood flow to the heart muscle, is known as:
| 1. | hypoxia | 2. | infarction |
| 3. | angina | 4. | diaphoresis |
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What is the percentage of atrial blood that flows into the ventricles without atrial systole?
| 1. | 90 | 2. | 70 |
| 3. | 50 | 4. | 30 |
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Atria can completely empty during ventricular filling due to:
1. A-V node
2. A-V bundle
3. S-A node
4. Purkinje fibers
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