Which of the following would you expect not to happen in a person that has taken a sympathetic agonist drug? ? decreased blood pressure ? sweating ? increased blood sugar level ? dilation of respiratory passages Question 43 What does the vagus nerve (CN X) innervate? ? cardiac muscle cells ? blood vessels ? skeletal muscle tissue ? sweat glands 2 pts
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Sympathetic agonist drugs stimulate the sympathetic nervous system, which is part of the autonomic nervous system responsible for the "fight or flight" response. These drugs typically cause an increase in heart rate, blood pressure, and blood sugar levels, as well Show more…
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Given what you know about the sympathetic nervous system, which of the following drugs could NOT be considered to act as, or in a manner comparable to, a sympathomimetic? Select one: a. amphetamine b. pilocarpine c. atropine d. nicotine e. tyramine 23. Overdose due to excessive exposure to organophosphate pesticides (acetylcholinesterase inhibitors) is treated with drugs that only manage the muscarinic receptor activation. The remaining excess nicotinic receptor activation can result in which of the following complications? Select one: a. bronchoconstriction b. difficulty breathing c. excessive urination (micturition) d. excessive sweating (diaphoresis)
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A patient faints if he gets up out of bed too quickly. Which one of the following events would most likely account for such fainting? A) Reduced baroreflex function. B) Exaggerated increase in renal sympathetic nerve activity. C) A baroreflex-mediated reduction in heart rate. D) Increased blood pressure. E) Activation of the Cushing response. 2. Mean arterial pressure readings over 3 months are between 95 and 105 mmHg for patient X and between 140 and 150 mmHg for patient Y. What is the effect of a rapid decrease in carotid sinus pressure? A) Increase in both sympathetic and parasympathetic nerve activity only in patient X. B) Increase in sympathetic and decrease parasympathetic nerve activity only in patient X. C) Increase in firing in the baroreceptor afferents about equally in both patients. D) Increase in plasma renin activity only in patient Y. E) Decrease in parasympathetic nerve activity about equally in both patients.
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Which of the following will occur as a result of baroreceptors? 1. Increased action potential discharge of aortic baroreceptors 2. Decreased activity of parasympathetic ganglion neurons controlling the heart 3. Increased vagus nerve activity 4. Increased force of cardiac muscle contraction 45. Which of the following is/are normal acute cardiovascular responses to exercise? 1. Fall in venous return to the heart 2. Marked increase in total peripheral resistance (TPR) 3. Increase in mean arterial blood pressure 4. Dilation of blood vessels to the skin 5. Maintenance of normal body temperature 46. Which is the most important long-term factor (weeks to months) that determines blood pressure? 1. Number of heart B-adrenoceptors 2. Number of nerve fibers innervating the aortic and carotid arch baroreceptors 3. High-pressure baroreceptors 4. Blood volume 5. Skeletal muscle activity and posture 6. Pulmonary blood flow Which of the following mechanisms will cause an immediate increase in cardiac output? 1. Activation of the sympathetic nervous system 2. Dilation of veins 3. Activation of high-pressure baroreceptors 4. Stimulation of the vagus nerve A man has been wounded in a knife fight and has lost a significant amount of blood (about 15% of his normal volume). The body tries to compensate by increasing cardiac output to supply oxygen to the tissues. Which of the following mechanisms is plausible for this? 1. Constriction of veins and venules in the systemic circulation 2. Inhibition of parasympathetic preganglionic cells in the vagus nerve 3. Increase in heart rate 4. Increase in force of ventricular contraction
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