Answer: Simple diffusion.
- A Simple diffusion
- B Active dialysis
- C Pressure filtration
- D Micturition
Correct answer: A. Simple diffusion
Explanation: In Amoeba the highly soluble ammonia simply diffuses out across the body surface into the surrounding water.
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 →