Pyrogens are chemicals produced by bacteria or cells of the immune system. Which part of the brain is affected by pyrogens?
Pons
Cerebral cortex
Hypothalamus
Amygdala
The Correct Answer is C
A. Pons: The pons is involved in regulating the rate and depth of breathing but is not the primary site affected by pyrogens for temperature regulation.
B. Cerebral cortex: The cerebral cortex is responsible for higher-order functions like reasoning and sensory perception but does not directly regulate body temperature in response to pyrogens.
C. Hypothalamus: The hypothalamus acts as the body’s thermostat and is directly affected by pyrogens, leading to the elevation of body temperature (fever) as part of the immune response.
D. Amygdala: The amygdala is primarily involved in emotion regulation and does not play a direct role in temperature regulation.
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Related Questions
Correct Answer is D
Explanation
A. Seminal duct: There is no structure specifically called the "seminal duct" in male anatomy.
B. Epididymis: The epididymis is the tube where sperm mature, and it connects to the ductus deferens, not the urethra.
C. Prostatic duct: Prostatic ducts release prostatic fluid into the urethra, but they do not connect the ductus deferens to the urethra.
D. Ejaculatory duct: The ejaculatory duct connects the ductus deferens to the urethra, allowing sperm to enter the urethra for ejaculation.
Correct Answer is A
Explanation
A. It decreases the heart rate.: Acetylcholine is a neurotransmitter that binds to receptors in the heart, leading to a decrease in heart rate by activating the parasympathetic nervous system.
B. It increases the heart rate.: Acetylcholine does not increase heart rate; that function is primarily associated with norepinephrine, which is part of the sympathetic nervous system.
C. It increases the rate of spontaneous depolarization: Acetylcholine actually decreases the rate of spontaneous depolarization in pacemaker cells of the heart, leading to a slower heart rate.
D. It shortens the time for repolarization.: Acetylcholine does not shorten repolarization; it increases the duration of repolarization due to the hyperpolarizing effects on the heart cells.
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