# Life Sciences: Endocrine system and homeostasis

> 17 questions based on past NSC papers, on endocrine system and homeostasis, 34 marks in our Paper 1 questions. Answer one and see it marked mark by mark.

Canonical: https://sharpkop.co.za/life-sciences/endocrine-homeostasis/
Last updated: 2026-11-12

## Questions

- [Nov 2024 · Paper 1 · Q1.1.1 (2 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q1-1-1/): Which hormone controls the amount of water in the blood by changing how much water the kidneys reabsorb? Choose the correct letter.
- [Nov 2024 · Paper 1 · Q1.1.3 (2 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q1-1-3/): A learner runs hard on the sports field and the carbon dioxide level in her blood rises above normal.
- [Nov 2024 · Paper 1 · Q1.1.4 (2 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q1-1-4/): A learner runs for a bus after getting a sudden fright and the adrenal glands release adrenalin.
- [Nov 2024 · Paper 1 · Q1.1.7 (2 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q1-1-7/): Which ONE of the following parts of the human brain acts as the body’s control centre for keeping its temperature steady?
- [Nov 2024 · Paper 1 · Q1.5.1 (2 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q1-5-1/): The diagram below shows some structures of the human body that take part in homeostasis.
- [Nov 2024 · Paper 1 · Q1.5.2 (4 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q1-5-2/): The diagram below shows a section through human skin, with structures labelled P, Q, R and S.
- [Nov 2024 · Paper 1 · Q1.5.3(a) (1 mark)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q1-5-3-a/): Name the hormone that is released from the pituitary gland (the gland labelled P in the diagram below) to help the body control the...
- [Nov 2024 · Paper 1 · Q1.5.3(b) (1 mark)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q1-5-3-b/): The diagram below shows a person with some organs and glands involved in keeping the body’s water balance steady.
- [Nov 2024 · Paper 1 · Q3.3.2 (4 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-3-2/): After a meal, the hormone insulin is released and the blood glucose level falls back to normal.
- [Nov 2024 · Paper 1 · Q3.3.3 (1 mark)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-3-3/): Look at the results in the table. Which group, P or Q, consists of the people with healthy blood glucose control? Write only the letter.
- [Nov 2024 · Paper 1 · Q3.3.4 (3 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-3-4/): A study looked at how insulin affects blood glucose. Two groups of eight adults each drank 75 g of glucose. Group P was healthy.
- [Nov 2024 · Paper 1 · Q3.4.1(a) (1 mark)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-4-1-a/): The flow diagram below shows how the level of calcium in the blood is kept steady in the human body.
- [Nov 2024 · Paper 1 · Q3.4.1(b) (1 mark)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-4-1-b/): The diagram below shows how the level of a hormone in the blood is kept steady by the pituitary gland and a gland in the neck.
- [Nov 2024 · Paper 1 · Q3.4.1(c) (1 mark)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-4-1-c/): The diagram below shows how the level of thyroxin in the blood is kept steady.
- [Nov 2024 · Paper 1 · Q3.4.2 (1 mark)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-4-2/): The thyroid gland releases a hormone called thyroxin into the blood. Give ONE function of thyroxin in the human body.
- [Nov 2024 · Paper 1 · Q3.4.3 (4 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-4-3/): The diagram below shows how the level of thyroxin in the blood of a healthy person is kept steady.
- [Nov 2024 · Paper 1 · Q3.4.4 (2 marks)](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-4-4/): A person has a thyroid gland that continuously secretes too little thyroxin. Explain why this may cause the person’s body mass to increase.

## Related

- [Grade 12 Life Sciences past papers](https://sharpkop.co.za/life-sciences/)

Questions are based on National Senior Certificate papers set by the Department of Basic Education. Sharpkop is not affiliated with or endorsed by the Department.