The two regulatory systems of the body are the endocrine system and the .

Correct Answer: C

Rationale: The correct answer is C: nervous system. The endocrine system regulates body functions through hormones, while the nervous system controls body functions through electrical impulses. Both systems coordinate and control various bodily functions. The skeletal system (A) supports and protects the body, the immune system (B) defends against pathogens, and the respiratory system (D) facilitates gas exchange. However, these systems do not primarily regulate and control bodily functions like the endocrine and nervous systems.

Correct Answer: B

Rationale: The correct answer is B (3 litres). The average adult human stomach secretes about 2-3 liters of gastric juice per day. This amount is necessary for the effective digestion of food, as gastric juice contains hydrochloric acid, enzymes, and mucus. Option A (1.5 litres) is too low for daily gastric juice secretion. Option C (4 litres) is too high and could lead to hypersecretion or other digestive issues. Option D is incomplete and does not provide a valid answer. Therefore, option B is the most accurate in reflecting the average daily secretion of gastric juice.

Correct Answer: C

Rationale: The correct answer is C: Kidney gland. The endocrine system consists of glands that secrete hormones directly into the bloodstream to regulate various bodily functions. The kidney is not a gland; it is an organ responsible for filtering waste from the blood and producing urine. The adrenal gland, thyroid gland, and pituitary gland are all part of the endocrine system as they secrete hormones. In summary, the kidney does not secrete hormones and therefore is not considered a gland in the endocrine system.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.