Chapter 21 Muscle Blood Flow and Cardiac Output During Exercise; the Coronary Circulation and Ischemic Heart Disease

Chapter 21  Muscle Blood Flow and Cardiac Output During Exercise; the Coronary Circulation and Ischemic Heart Disease

Complete Chapter Questions And Answers
 

Sample Questions

1. Which of the following normally causes vasodilation of skeletal muscle arterioles during exercise?
A. Decreased plasma osmolality
B. Decreased plasma nitric oxide concentration
C. Increased plasma potassium concentration
D. Decreased plasma adenosine concentration
E. Increased plasma histamine concentration

ANS: CC

2. The majority of venous blood flow leaves the heart muscle through the:
A. Anterior cardiac veins
B. Azygos vein
C. Bronchial veins
D. Coronary sinus
E. Thebesian veins

ANS: DD

3. A healthy 40-year-old man has been exercising maximally for 15 minutes. Which of the following conditions is likely to be present?
A. Arteriolar resistance in the gastrointestinal bed is increased by 200%
B. Cerebral blood flow is decreased to 50% of normal
C. Heart rate is unchanged
D. Cardiac output is increased 5%
E. Right atrial pressure is increased to 10 mmHg

ANS: A

4. Which of the following is normally associated with an increased tendency for the heart to fibrillate following a myocardial infarction?
A. Current of injury from ischemic cardiac muscle
B. Decreased extracellular potassium concentration
C. Decreased sympathetic stimulation
D. Increased extracellular sodium concentration
E. Decrease in cardiac volume

ANS: A

5. Which of the following vascular beds experiences the most vasoconstriction in a person near the end of a five mile run?
A. Cerebral
B. Coronary
C. Exercising muscle
D. Intestinal
E. Skin

ANS: DD