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. Parietal pleura: The parietal pleura is the outer layer of the pleura that lines the thoracic cavity and is connected to the thoracic wall.
B. Diaphragm: The diaphragm is the main muscle involved in respiration, but it is not part of the lung's outer layer.
C. Pleural cavity: The pleural cavity is the space between the parietal and visceral pleura, filled with pleural fluid to reduce friction.
D. Visceral pleura: The visceral pleura is the inner layer that covers the lungs but does not connect to the thoracic wall.
Correct Answer is B
Explanation
A. To increase the effectiveness of drugs and hormones in the blood: Tubular secretion helps in removing drugs and hormones, not increasing their effectiveness.
B. To remove excess quantities of substances from the blood: Tubular secretion is responsible for removing excess ions, waste products, and drugs from the blood and excreting them into the urine.
C. To filter out pathogens from the blood: Filtration primarily occurs at the glomerulus, not tubular secretion, and it does not focus on pathogens.
D. To remove 99% of the water from the blood: This is not the purpose of tubular secretion; water reabsorption primarily happens in the nephron’s other parts.
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