An increase in which of the following is a result of stimulation of the sympathetic nervous system?
Peristalsis
Bladder tone
Heart rate
Saliva
The Correct Answer is C
A. Peristalsis, the wave-like contraction of the digestive tract, is typically decreased during sympathetic stimulation. The sympathetic nervous system tends to slow digestive processes as the body prioritizes "fight-or-flight" responses.
B. Bladder tone is typically decreased by sympathetic stimulation. The sympathetic nervous system causes relaxation of the bladder, inhibiting urination during stressful situations.
C. Heart rate increases with sympathetic stimulation. The sympathetic nervous system prepares the body for action by increasing heart rate, enhancing blood flow to muscles, and increasing energy levels.
D. Saliva production decreases with sympathetic stimulation. The body reduces non-essential functions such as salivation during stress, focusing energy on immediate survival functions.
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Related Questions
Correct Answer is B
Explanation
A. Lacrimal glands produce tears and are not involved in the formation of blackheads.
B. Sebaceous glands secrete sebum, an oily substance that can clog hair follicles when produced in excess. This blockage, combined with oxidation, leads to the formation of blackheads on the skin.
C. Sweat glands produce sweat and are not involved in the formation of blackheads, which result from excess sebum and not sweat.
D. Ceruminous glands secrete earwax (cerumen) and are not involved in blackhead formation, as they are located in the ear canal and not on the skin's surface.
Correct Answer is A
Explanation
A. The frontal lobe is responsible for higher cognitive functions, including emotional regulation, problem-solving, decision-making, and controlling emotional responses. A frontal-lobe injury can impair emotional stability, making it difficult for the individual to manage emotions appropriately. This is the correct answer.
B. Speech comprehension is primarily associated with the temporal lobe, particularly in areas like Wernicke’s area, not the frontal lobe.
C. Vision is processed in the occipital lobe, so a frontal-lobe injury would not typically affect vision.
D. Swallowing involves motor control that is often linked to the brainstem, not the frontal lobe.
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