u. Associated with adrenergic fibers 19. A beta-adrenergic agonist a. increases heart rate. b. causes the release of acetylcholine. c. blocks the effects of norepinephrine at its receptor site. d. lowers blood pressure.
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Step 1: Beta-adrenergic agonists are drugs that stimulate the sympathetic nervous system. Show more…
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Which of the following neurons is most likely to be adrenergic? A) postganglionic somatic motor B) postganglionic parasympathetic C) preganglionic sympathetic D) postganglionic sympathetic E) preganglionic parasympathetic An injection of epinephrine would increase heart rate, increase blood pressure, decrease gastric motility. Beta-blockers (beta-adrenergic blocking agents) are frequently used to prevent decreases in heart rate. Which of the following would affect the functioning of the parasympathetic system? A) Removal of the anterior pituitary B) Adrenal medulla C) Pancreas D) Thyroid gland E) Parathyroid gland Which of the following occurs when the motility of the digestive tract is decreased? A) Increased blood pressure B) Increased motility of the digestive tract C) Increased metabolism D) Increased heart rate
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6. Nicotinic receptors bind: A. acetylcholine and allow chloride ions to exit the cell. B. acetylcholine and allow sodium ions to enter the cell. C. muscarine and increase the contractility of intestinal muscle. D. norepinephrine and can either stimulate or inhibit the cell. E. norepinephrine and allow potassium entry, thereby exciting the cell. 7. Muscarinic receptors are proteins that bind the neurotransmitter: A. acetylcholine. B. epinephrine. C. norepinephrine. 8. Stimulation of β2 receptors in the lung causes: A. bronchoconstriction. B. bronchodilation. 9. In the heart, activation of these receptors increases heart rate. A. α1 B. α2 C. β1 D. β2 Trace the path leading to the effector for #9 starting in the CNS (brain or spinal cord). Include the name for the receptors on the receptive segment of the postganglionic neuron and on the effector.
Which of the following is an incorrect pairing? a. norepinephrine dilates the pupil b. epinephrine increases blood pressure c. acetylcholine decreases digestion d. norepinephrine increases heart rate
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