Lipid-soluble hormones readily diffuse through capillary walls, whereas water-soluble hormones, such as proteins, remain in the blood. a. pass through capillary cells. b. pass through pores in the capillary endothelium. c. be moved out of the capillary by active transport. d. remain in the blood. e. be broken down to amino acids before leaving the blood.

b. pass through pores in the capillary endothelium

Explanation:

The fenestrated capillaries and sinusoids have pores in their endothelium. These pores or the intracellular clefts vary in size between the fenestrated capillaries and sinusoids. Sinusoids have larger intracellular clefts. The pores serve as a passage for the movement of water-soluble substances, proteins and other substances that cannot cross the hydrophobic interior of the cell membranes.

Water-soluble hormones also cannot pass through the capillary walls. Therefore, these hormones pass through the pore or the fenestrations present in the endothelium of capillaries.

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