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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. thalamus: This is a structure in the brain that acts as a relay station for sensory information.
B. thyroid: This is an endocrine gland in the neck that regulates metabolism.
C. thymus: The thymus is considered a primary lymphoid organ because it is the site where T-lymphocytes (T cells) mature and become immunocompetent.
D. spleen: The spleen is a secondary lymphoid organ; it filters blood but is not where lymphocytes are "born" or matured.
Correct Answer is D
Explanation
A. Environment: Factors like pollution, climate, or radiation exposure are known risk factors for various diseases.
B. Stress: Chronic stress weakens the immune system and contributes to cardiovascular and mental health issues.
C. Lifestyle: Choices regarding diet, exercise, and tobacco use directly impact the risk of developing chronic illnesses.
D. All of the above: Since environment, stress, and lifestyle are all recognized as significant risk factors for disease, "All of the above" is correct.
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