Answer: Increased blood volume stretching the atrial wall.
- A Low sodium concentration in the blood under most conditions studied
- B Increased blood volume stretching the atrial wall
- C A drop in overall blood volume as widely reported
- D A drop in systemic blood pressure in standard reference material
Correct answer: B. Increased blood volume stretching the atrial wall
Explanation: Increased blood volume stretches the atria, triggering ANF release, which dilates blood vessels and reduces blood pressure, acting as a check on the renin-angiotensin system.
Filtrate flows through four functionally distinct stages of the nephron: Bowman's capsule filters blood, the PCT reabsorbs most useful substances unconditionally, the Loop of Henle builds a concentration gradient via counter-current exchange, the DCT secretes selected substances, and the collecting duct performs the final ADH-controlled water reabsorption.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
Read the full Excretory Products and their Elimination notes →