Pearson Edexcel IGCSE · Human Biology

Homeostatic mechanisms: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Homeostatic mechanisms.

10 questions23 marksFree, no account

Question 1

1 mark

Which hormone is primarily responsible for decreasing the concentration of glucose in the blood when it rises above the normal set point?

Question 2

1 mark

A person consumes a very large amount of water in a short period of time. How will the level of Antidiuretic Hormone (ADH) and the permeability of the collecting ducts in the kidney change?

Question 3

1 mark

Which of the following correctly describes the sequence of events involved in the excretion of nitrogenous waste in humans?

Question 4

1 mark

In the context of negative feedback, which organ acts as the detector for changes in blood glucose concentration?

Question 5

1 mark

When the water potential of the blood is too low, the pituitary gland releases more Antidiuretic Hormone (ADH). How does this affect the kidney tubules?

Question 6

2 marks

Identify the metabolic waste products that are removed from the body via the renal system during the formation of urine.

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Question 7

3 marks

Explain how shivering contributes to the maintenance of a constant core body temperature when the external environment is cold.

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Question 8

5 marks

In an experiment using Visking tubing to model a kidney, the tubing is filled with a mixture of glucose and starch. Explain why glucose is detected in the surrounding water but starch is not.

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Question 9

4 marks

(a) State the exact definition of excretion as it applies to human physiology and list two metabolic waste products, other than urea, that are removed from the body.
(b) Name the organ where urea is formed and identify the specific chemical process involved in its production from excess amino acids.

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Question 10

4 marks

(a) Define the term homeostasis and explain why the maintenance of a constant internal environment is essential for the activity of enzymes within the human body.
(b) Describe the changes that occur in the skin to help reduce body temperature when a person becomes too hot. In your answer, refer to the role of sweat glands and the process of vasodilation.

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