By what procress does the nephron reclaim na+ ions?

The answer is active transport. This is because the concentration of sodium ions in the blood will be higher than in the filtrate in the collecting tubes hence energy is required to transport the ions against the concentration gradient. This is important in maintaining electrolyte homeostatic balance in the blood. Aldosterone is the hormone that regulates the rate at which reabsorption of na+ ions occurs.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.