Which of the following are structures that rely on capillaries for exchange or movement of small molecules?
A. Teeth, aorta, ureter.
B. Cartilage, epidermis, larynx.
C. Nephron, villi, alveoli.
D. Leukocytes, atrium, bronchi.
Can you check this please, it doesn't really talk about this in my book. My answer is B, thanks!
C. Nephron, villi, alveoli
Capillaries in these structures allow the easy transfer of molecules to these tissues.
Oh okay, thank you. It doesn't really talk about this in my book.
Same i have to come to this site all the time to get help on my quizzes and other assignments.
To determine which structures rely on capillaries for the exchange or movement of small molecules, let's go through each option individually.
A. Teeth, aorta, ureter.
Teeth are not involved in the exchange or movement of small molecules, and neither is the aorta or ureter. Therefore, Option A is not correct.
B. Cartilage, epidermis, larynx.
Cartilage is a connective tissue that does not have a direct blood supply, so it does not rely on capillaries for the exchange of small molecules. Epidermis is the outermost layer of the skin and does not involve direct capillary exchange either. The larynx, which is responsible for voice production, is not primarily involved in the exchange or movement of small molecules. Therefore, Option B is not correct.
C. Nephron, villi, alveoli.
The nephron is the functional unit of the kidney, which is responsible for the filtration and reabsorption of waste products and small molecules. Villi are small, finger-like projections in the small intestine that increase the surface area for nutrient absorption, and they rely on capillaries for the transport of nutrients. Alveoli are tiny air sacs in the lungs, and they are surrounded by capillaries, supporting the exchange of oxygen and carbon dioxide. Therefore, Option C is correct.
D. Leukocytes, atrium, bronchi.
Leukocytes (white blood cells) are involved in the immune response and do not rely on capillaries for small molecule exchange. The atrium is a chamber in the heart, and while it receives blood from the capillaries, it is not directly involved in small molecule exchange. Bronchi are the main passageways in the respiratory system and do not play a direct role in small molecule exchange. Therefore, Option D is not correct.
Based on the explanations above, Option C (Nephron, villi, alveoli) is the correct answer as these structures rely on capillaries for the exchange or movement of small molecules.