Kidney is an organ of excretion and osmoregulation in humans. Regulation of which two substances is done by the kidneys?

Correct option is D

The correct option is D

Explanation:

The kidneys regulate the levels of water and sodium in the human body.

Information Booster:

• ​Osmoregulation: The kidneys maintain the balance of water and electrolytes, crucial for homeostasis.
• Water Regulation: They adjust water reabsorption based on hydration status, conserving water when dehydrated and increasing urine output when overhydrated.
  
• Sodium Regulation: The kidneys filter sodium and reabsorb it as needed, influenced by hormones like aldosterone, which helps manage blood pressure and fluid balance.
  
• Hormonal Control: Hormones such as antidiuretic hormone (ADH) and aldosterone play significant roles in regulating both water and sodium levels.