Question 10 options: 10. When activated, the __________________________ sends si
ID: 95381 • Letter: Q
Question
Question 10 options:
10.
When activated, the __________________________ sends signals to motor neurons in the spinal cord to elicit voluntary movement in skeletal muscles.
A. Central Nervous System
B. Peripheral Nervous System
C. Autonomic Nervous System
D. Sympathetic Nervous System
E. Parasympathetic Nervous
Question 9 options:
9.
When activated, the _________________________ causes the heart rate to accelerate and blood vessels (arterioles) to constrict.
A.Central Nervous System
B. Peripheral Nervous System
C. Sympathetic Nervous System
D. Parasympathetic Nervous
Explanation / Answer
10. When activated, the PERIPHERAL NERVOUS SYSTEM sends signals to motor neurons in the spinal cord to elicit voluntary movement in skeletal muscles.
The somatic nervous system (SoNS or voluntary nervous system) is the part of the peripheral nervous system associated with skeletal muscle voluntary control of body movements. The somatic nervous system consists of afferent nerves or sensory nerves, and efferent nerves or motor nerves. Afferent nerves are responsible for relaying sensation from the body to the central nervous system; efferent nerves are responsible for sending out commands from the CNS to the body, stimulating muscle contraction; they include all the non-sensory neurons connected with skeletal muscles and skin.
9. When activated, the SYMPATHETIC NERVOUS SYSTEM causes the heart rate to accelerate and blood vessels (arterioles) to constrict.
The cardiac output is increased, of course, via sympathetic nerves that increase the heart rate and increase the stroke volume. Also, the stroke volume potentially can increase via the Frank-Starling mechanism. This is because contracting skeletal muscles tend to squeeze blood in their veins back to the central veins via muscle pumping. The elevated pressure in the central veins then in some circumstances can increase the end diastolic volume and thus the stroke volume.
At the same time as skeletal muscle arterioles dilate, arterioles to certain other areas help compensate by constricting. The primary organs for this sympathetic vasoconstriction are the gut, skin and inactive skeletal muscles.
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