21. Distention of the stomach causes glandular secretions and peristalsis in the

Question

21. Distention of the stomach causes glandular secretions and peristalsis in the describes which of the following reflexes? a. Gastroenteric reflex b. Gastroileal reflex c. Enterogastric reflex 22. Which of the following is a component of bile? a. Heme from red blood cells b. Cholesterol c. Urobilinogen 23. Which intestinal hormone has the greatest effect on lipid digestion by stimulating the secretion of bile and pancreatic enzymes? a. Secretin b. Gastric Inhibitory Peptide c. Cholecystokinin 24. What is the function of surfactant? a. To decrease surface tension and keep alveoli from collapsing b. To decrease compliance. (stretchability) c. To increase the radius of the trachea and bronchi 25. Which of the following play(s) a role in keeping the lungs inflated? a. Transpulmonary pressure gradient where intrapulmonary pressure is greater thar intrapleural pressure b. Residual air volume c. Surfactant d. All of the above 26. Which of the following have an effect on the amount of oxygen that diffuses into the blood at the alveoli? a. The pO2 gradient across the respiratory membrane b. The amount hemoglobin in blood c. Pulmonary edema d. All of the above 27. Why does a pneumothorax causes the lungs to collapse? a. Lung compliance increases and alveoil collapse b. Surfactant leaks out of the lungs and the alveoli collapse c. The transpulmonary pressure gradient is abolished. Elastic recoil of the lungs pulls the pleural membranes apart and the lung(s) collapse

Explanation / Answer

21.A.gatroenteric reflex

stimulated by stomach by streching and presense of food.increased small intestinal activity.

22.b.cholesterol

bile contains water, bilirubin,bile salts

23.c.cholecystokinin

secreted by duodenum. stimulate release pof bile into intestine and secretion of enzymes.

24.a.reduces surface tension and keep alveoli from collapsing.

surfactant released by epithetial type 2 cells

25.d. all of above

intrapleural pressure always negative which act as suction and keep lung inflated.

26.d. all of above

27.c. transpulmonay pressure gradient abolished.elastic recoil of lungs pulls the pleural membranes apart and lungs collapse.

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