Catecholamines are secreted from the adrenal medulla in response to A) increased

Question

Catecholamines are secreted from the adrenal medulla in response to A) increased secretion of ACTH from the anterior pituitary B) decreased androgen secretion from the adrenal cortex C) hyperglycemia D) stimulation by chromaffin releasing hormone

Page: 10 64. Catecholami es are secreted from the adrenal medulla in response to a. increased secretion of ACTH from the anterior pituitary. D. stimulation of sympathetic preganglionic neurons leading to the adrenal medulla. c. decreased androgen secretion from the adrenal cortex. d. hyperglycemia. e. stimulation by chromaffin-releasing hormone 65. Blood flows continuously through all capillaries. a. True b. False 66. What is the primary method by which materials such as o2, co2 and nutrients are exchanged between the blood and surrounding tissues? a. active transport of materials across the capillary wall b. osmotic pressure drawing water and solutes out of the capillary, thereby bringing these dissolved nutrients into contact with the tissue cells c. passive diffusion of substances across the capillary wall down their concentration gradients d. the combined processes of ultrafiltration and reabsorption e. bulk flow 67. The walls of the veins contain smooth muscle innervated by sympathetic nerve fibers. Sympathetic stimulation blood into the heart. a. increases, more b. increases, less c. decreases, more d. decreases, less e. None of the above are correct. venous pressure and drives 58. The first means by which ATP is produced at the onset of contractile activity a. oxidative phosphorylation. b. transfer of energy and phosphate from creatine phosphate to ADP c. glycolysis. d. degradation of myoglobin. e. None of the above is correct. 9. The low-resistance pathway that permits electrical activity pass from cell-to- in myocardial tissue is the

Explanation / Answer

d) stimulation by chromaffin releasing hormones.

The sympathetic division of ANS exerts direct control over chromaffin cells. These cells stimulate adrenal medulla to secrete catacholamines at high rates.

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