# Life Sciences Paper 1, November 2024, question 3.4.1(a)

> The flow diagram below shows how the level of calcium in the blood is... Marked mark by mark. Q3.4.1(a), Life Sciences Paper 1 November 2024, 1 mark.

Canonical: https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-4-1-a/
Last updated: 2026-11-12

Subject: Life Sciences. Source: Based on Nov 2024 · Paper 1 · Q3.4.1(a). Marks: 1. Not yet checked by a teacher.

## Question 3.4.1(a) (1 mark)

The flow diagram below shows how the level of calcium in the blood is kept steady in the human body. Each rise or fall in the level triggers a hormone response that moves the level back towards its normal value. Name the type of control mechanism shown by the diagram.

Figure: Flow diagram of negative feedback. Two boxes: Parathyroid gland (left) and Bone and kidneys (right). Top dashed loop: blood calcium level too high leads to less parathyroid hormone. Bottom solid loop: blood calcium level too low leads to more parathyroid hormone. Each change is reversed.

## Practise it

[Answer this question](https://sharpkop.co.za/life-sciences/2024-nov-p1/q3-4-1-a/) and see it marked mark by mark, with the reason for every lost mark.

## Related

- [More endocrine system and homeostasis questions](https://sharpkop.co.za/life-sciences/endocrine-homeostasis/)
- [Life Sciences Paper 1, November 2024](https://sharpkop.co.za/life-sciences/2024-nov-p1/)
- [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.