PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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slows the heartbeat down
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increases blood flow to the digestive tract to help digest food
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dilates the pupils to improve distance vision
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speeds the heartbeat up
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contracts the pupils to improve close vision
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Detailed explanation-1: -It could be called your “automatic” nervous system, as it’s responsible for many functions that you don’t have to think about to control. This can include control of your heart rate, blood pressure, digestion, urination and sweating, among other functions.
Detailed explanation-2: -The iris sphincter is innervated by the parasympathetic nervous system, the part of the autonomic nervous system that is involved in homeostasis (i.e. keeping the body in stable condition); the link between pupil constriction and the parasympathetic nervous explains why pupils are relatively small at rest.
Detailed explanation-3: -In the stomach and intestines, parasympathetic stimulation of M receptors leads to increased motility and relaxation of sphincters. Stimulation of M receptors also increases gastric secretions to aid in digestion. In the gallbladder, parasympathetic stimulation of M3 receptors stimulates contraction to release bile.
Detailed explanation-4: -Stimulation of the cranial parasympathetic system results in the constriction of the pupil and increased lens curvature, while stimulation of the spinal sympathetic system results in the dilation of the pupil.