ENDOCRINE SYSTEM - Hormone Regulation Mechanisms

Question 1

How is hormone secretion regulated?

Answer 1

Hormonal: Other hormones (e.g., hypothalamus → pituitary).

Humoral: Blood levels of ions/substances (e.g., Ca²⁺ & parathyroid hormone).

Nervous: Neural control (e.g., adrenal medulla & stress response).

Question 2

Example of negative feedback?

Answer 2

Low Ca²⁺ in blood → Parathyroid releases PTH → Increases Ca²⁺ → PTH secretion stops.

Question 3

Example of nervous regulation?

Answer 3

Stress → Sympathetic nerves activate adrenal medulla → Releases adrenaline → Stress response → System restores balance.