MCDB 111 Su 2017 Section quiz 4a Key 8/31/17 Mark the best answer to each question on your scantron form. Make sure your name, perm, and MCDB 111 Summer quiz 4 appears on the answer form. Each correct answer is worth half a point. 1. Which of the following is true of pulse pressure? a. It is a measure of the maximum arterial pressure b. It is a measure of the mean venous pressure c. It is the average of the systolic and diastolic pressures d. It is the difference between the systolic and diastolic pressures e. It is a product of the cardiac output and total peripheral resistance 2. What do the afferent baroreceptor neurons actually detect in order to determine whether arterial pressure is within an acceptable range? a. Changes in arterial diameter b. Changes in arterial circumference c. Stretching of the arterial wall d. Changes in arterial length e. Tension produced by vascular smooth muscle fibers 3. Bulk flow is important for: a. The distribution of extracellular fluid b. transport of glucose into interstitial fluid c. transport of O2 from alveoli to red blood cells d. moving large molecules like proteins out of the capillaries e. regulating blood pH 4. Individuals who engage in regular aerobic exercise tend to develop lower resting blood pressure and a greater cardiac output than they had when they did not exercise regularly. Which of the following alterations in physiological parameters would be consistent with these findings? a. An increase in total peripheral resistance (TPR) b. A decrease in total peripheral resistance (TPR) c. An increase in functional residual capacity of the lungs d. A decrease in the functional residual capacity of the lungs e. b and d 5. The return of venous blood to the heart is facilitated by a. skeletal muscle contraction b. skeletal muscle relaxation c. a decrease in blood volume d. expiration of air from the lungs e. b, c, and d 6. Gas exchange between air and blood occurs within which of the following structures? a. Bronchi b. Bronchioles c. Alveolar sacks d. Alveolar ducts e. Trachea7. Pneumothorax can result from a. a puncture in the lung wall allowing air from the lungs to enter the pleural cavity b. a puncture in the chest wall allowing air from outside of the body to enter the pleural cavity c. a puncture in the diaphragm allowing air from the lungs to enter the abdominal cavity d. a type of pneumonia resulting from accidental inhalation of food particles into the bronchioles e. a and b 8. Capillary a. blood flow rate is reduced relative to arterioles to facilitate exchange of ions and other small molecules b. blood flow rate is increased relative to arteries to facilitate exchange of ions and other small molecules c. smooth muscle facilitates blood flow d. permeability is regulated by nitric oxide (NO) e. b and d 9. Which of the following processes is enhanced by the activation of b1 receptors in cardiac muscle cells? a. Opening of L type calcium channels b. Opening of ryanodine receptor linked calcium channels c. The calcium-induced displacement of troponin from myosin d. The ATP-dependent myosin-actin crossbridge cycle e. All of the above 10. If atmospheric pressure is 760 mm Hg and the partial pressure of CO2 is 0.3 mm Hg, what is the approximate % of CO2 in the atmosphere? a. 12% b. 6 % c. 2 % d. 0.5 % e.
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