Multiple Choice
Which of the following is a receptor molecule involved in cell signaling?
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10. Cell Signaling
Introduction to Cell Signaling
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Which of the following statements about capillary beds is correct?
A
Capillary beds are responsible for generating action potentials in neurons.
B
Capillary beds are composed primarily of smooth muscle cells that contract to pump blood.
C
Capillary beds are networks of tiny blood vessels where exchange of gases, nutrients, and wastes occurs between blood and tissues.
D
Capillary beds are found only in the heart and not in other tissues.
Verified step by step guidance1
Step 1: Begin by understanding what capillary beds are. Capillary beds are networks of tiny blood vessels (capillaries) that connect arterioles (small arteries) to venules (small veins). Their primary function is to facilitate the exchange of gases, nutrients, and waste products between the blood and surrounding tissues.
Step 2: Analyze the first statement: 'Capillary beds are responsible for generating action potentials in neurons.' This is incorrect because action potentials are electrical signals generated by neurons, not by capillary beds. Capillary beds are involved in the circulatory system, not the nervous system.
Step 3: Evaluate the second statement: 'Capillary beds are composed primarily of smooth muscle cells that contract to pump blood.' This is also incorrect. While smooth muscle cells are found in the walls of arterioles and venules, capillaries themselves are composed of a single layer of endothelial cells and do not contain smooth muscle. They do not pump blood; blood flow through capillaries is driven by the heart and regulated by precapillary sphincters.
Step 4: Assess the third statement: 'Capillary beds are networks of tiny blood vessels where exchange of gases, nutrients, and wastes occurs between blood and tissues.' This is correct. Capillary beds are the primary sites for the exchange of oxygen, carbon dioxide, nutrients, and waste products between the blood and the surrounding tissues.
Step 5: Review the fourth statement: 'Capillary beds are found only in the heart and not in other tissues.' This is incorrect because capillary beds are present throughout the body in nearly all tissues, not just in the heart. They are essential for delivering oxygen and nutrients to tissues and removing waste products.
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