Why do the walls of capillaries consist of only one layer?
This allows for rapid exchange of oxygen and nutrients.
This allows for red blood cell formation to occur.
There is no blood pressure within the capillaries.
Blood does not travel through capillaries.
The Correct Answer is A
A. This allows for rapid exchange of oxygen and nutrients: Capillaries have thin walls (one cell thick) to facilitate the rapid diffusion of gases (oxygen and carbon dioxide), nutrients, and waste products between blood and tissues.
B. This allows for red blood cell formation to occur: Red blood cells are formed in the bone marrow, not in capillaries.
C. There is no blood pressure within the capillaries: There is still blood pressure within capillaries, although it is lower than in arteries, so this is incorrect.
D. Blood does not travel through capillaries: Blood does indeed travel through capillaries as part of the circulatory system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is C
Explanation
A. Prostate: The prostate gland contributes to the semen volume but only about 20-30%. It produces a fluid that nourishes sperm and helps transport them but is not the primary contributor to the total volume of semen.
B. Ductus Deferens: The ductus deferens (vas deferens) is a tube that transports sperm from the epididymis to the ejaculatory duct. It does not produce or contribute to the volume of semen.
C. Seminal Vesicle: The seminal vesicles contribute approximately 60% of the total semen volume. They secrete a fluid that is rich in fructose and other substances that provide energy for sperm and help in the formation of semen.
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