8. Which of the following would you expect to happen to cellular respiration dur

Question

8. Which of the following would you expect to happen to cellular respiration during exercise? Increased cellular respiration occurs during exercise, causing a rise in plasma PCO2, which is detected by central chemoreceptors in the brain and perhaps peripheral chemoreceptors in the carotid sinus and aorta to cause an increase in respiration rate. a. b. Decreased cellular respiration occurs during exercise, causing a rise in plasma PCO2, which is detected by central chemoreceptors in the brain and perhaps peripheral chemoreceptors in the carotid sinus and aorta to cause a decrease in respiration rate Exercise causes a decrease in cellular respiration by shifting peripheral chemoreceptors in the heart to cause retention of oxygen. Increased cellular respiration occurs during exercise, causing a decrease in plasma PCO, which is detected by central chemoreceptors in the brain and perhaps peripheral chemoreceptors in the carotid sinus and aorta to cause a decrease in respiration rate. c. d. 149. Why would a collapsed right lung, due to a pneumothorax, also collapse the left lung!? a. The mediastinum is a mobile rather than a rigid partition between the two pleural sacs, thereby allowing the increased pressure in the side of the chest that is open to push the heart and other mediastinal structures toward the intact side, where they can exert pressure on the left lung. Subatmospheric pressure increases from its normal level and thereby moves from high pressure area (right lung) to low pressure area (left lung). When intrathoracic pressure increases, the mediastinum softens and thereby allows the increased pressure in the side of the chest that is open to push the heart and mediastinal structures toward the intact side, where they can exert pressure on the left lung. Intrathoracic pressure increases from its subatmospheric level to an atmospheric level, thereby allowing the pressure within the chest to increase in proportion to the volume of the thorax. b. c. d. 150. The flap of tissue suspended from the midpoint of the posterior border of the soft palate is the a. fauces. b. frenulum. c. uvula. d. gingiva. 151. The type of cell designed for absorption and secretion found throughout much of the GI tract is -epithelium. a. simple columnar b. stratified squamous c. simple squamous d. 23

Explanation / Answer

Ans148. (a) is the correct option.

During exercise, both cellular respiration and respiration rate increases. More ATP ( energy currency of the cell) and oxygen is required to perform hard work, so the body increases the production of ATP and breathing to meet body requirements.

Ans150. (c) uvula

It is made of connective tissue and muscle. Hangs at the edge of the throat.

Ans151. (a) Simple columnar.

They are found in the walls of the stomach and small intestine and large intestine. It has both secretory and absorptive function.

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