If the ventral nerve root of a spinal nerve were destroyed, a person would lose
sensory perception.
willed movement only.
reflex activity.
both reflex activity and sensation.
The Correct Answer is C
A. sensory perception: Sensation is carried by the dorsal (posterior) root. If only the ventral root is damaged, sensation remains intact.
B. willed movement only: While willed movement is lost because motor commands can't reach the muscle, this is not the only thing lost.
C. reflex activity: The ventral root is the "exit" for all motor commands. Without it, both voluntary movement and involuntary motor reflexes (like the knee-jerk) are impossible in that specific area.
D. both reflex activity and sensation: Sensation is unaffected by ventral root damage.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Thalamus: The thalamus acts as a relay station where we first become aware of a sensation in a "crude" or unrefined way before it is processed for detail elsewhere.
B. Cerebellum: The cerebellum processes proprioception and coordination but does not produce conscious sensory awareness.
C. Brainstem: The brainstem handles vital reflexes and signal conduction but is not the center for conscious sensory awareness.
D. Cerebral cortex: The cortex provides "fine" or precise sensory discrimination (exactly where and what a sensation is), which is the opposite of "crude" awareness.
Correct Answer is C
Explanation
A. filtration: This is a passive process where water and solutes are forced through a membrane by hydrostatic pressure.
B. osmosis: This is the passive diffusion of water.
C. endocytosis: This is a form of active transport (vesicular transport) that requires ATP to engulf substances into the cell.
D. dialysis: This is the passive diffusion of solutes across a selectively permeable membrane.
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