During the process of defecation, which of the following changes takes place?

Correct Answer: A

Rationale: The internal anal sphincter relaxes reflexively during defecation to allow stool passage, while the external sphincter is voluntarily controlled.

Correct Answer: B

Rationale: Lipase hydrolyzes triglycerides into fatty acids and glycerol, which are then absorbed.

Correct Answer: C

Rationale: Receptors detect changes in the internal environment as the first step in homeostasis.

Correct Answer: A

Rationale: Bowman's capsules, part of the nephron, are located in the renal cortex.

Correct Answer: C

Rationale: Aldosterone promotes sodium reabsorption in the distal tubule and collecting duct, indirectly aiding water retention.