1. The receptors found at synapses between preganglionic and postganglionic neurons of the sympathetic system are: a) muscarinic. b) nicotinic. c) beta adrenergic. d) alpha adrener... 1. The receptors found at synapses between preganglionic and postganglionic neurons of the sympathetic system are: a) muscarinic. b) nicotinic. c) beta adrenergic. d) alpha adrenergic. 2. The alarm response is accompanied by all of the following, EXCEPT: a) high level of circulating adrenaline. b) hypotension. c) pupillo-dilation (mydriasis). d) rise of blood glucose level. 3. The sweat glands are innervated by: a) adrenergic postganglionic sympathetic fibres. b) cholinergic postganglionic parasympathetic fibres. c) cholinergic postganglionic sympathetic fibres. d) adrenergic preganglionic sympathetic fibres. 4. Stimulation of vagal parasympathetic fibres causes: a) contraction of plain muscles of the rectum and relaxation of the internal anal sphincter. b) an increase in gastric secretion. c) vasodilation of blood vessels of pelvic viscera. d) increased salivary secretion. 5. The following could be the result of parasympathetic stimulation: a) excessive sweating. b) a dry mouth. c) dilatation of the pupil. d) Increase in gastric secretion. 6. The adrenal medulla receives sympathetic input from: a) preganglionic sympathetic neurons. b) postganglionic sympathetic neurons. c) postganglionic parasympathetic neurons. d) preganglionic parasympathetic neurons.
Understand the Problem
The question consists of multiple-choice questions related to the autonomic nervous system, specifically focusing on the sympathetic and parasympathetic systems and their physiological effects.
Answer
1. b) nicotinic. 2. b) hypotension. 3. c) cholinergic postganglionic sympathetic fibres. 4. b) increase in gastric secretion. 5. d) Increase in gastric secretion. 6. a) preganglionic sympathetic neurons.
- b) nicotinic. 2. b) hypotension. 3. c) cholinergic postganglionic sympathetic fibres. 4. b) an increase in gastric secretion. 5. d) increase in gastric secretion. 6. a) preganglionic sympathetic neurons.
Answer for screen readers
- b) nicotinic. 2. b) hypotension. 3. c) cholinergic postganglionic sympathetic fibres. 4. b) an increase in gastric secretion. 5. d) increase in gastric secretion. 6. a) preganglionic sympathetic neurons.
More Information
Nicotinic receptors are crucial for the transmission of impulses between neurons in the sympathetic system. Hypotension is not a part of the alarm response. Sweat glands are unique for being innervated by cholinergic fibres in the sympathetic system.
Tips
Nicotinic receptors are often confused with muscarinic, but they are key in synapses of both sympathetic and parasympathetic preganglionic neurons.
Sources
- Autonomic nervous system - Knowledge @ AMBOSS - amboss.com
- PHYSIOLOGY OF THE ANS - content.byui.edu
- 8.2: Divisions of the Autonomic Nervous System - Medicine LibreTexts - med.libretexts.org
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