SherpaSherpa Logo

Homeostasis Practice Questions

Question 1

3 marks

Homeostasis keeps the conditions inside the human body within narrow limits, even when there are changes inside and outside the body.

(a)

Which of these conditions is controlled by homeostasis?

Put a cross ( ☒ ) in the box next to your answer.

☐ A the volume of air in the lungs

☐ B the blood glucose concentration

☐ C the amount of hair on the skin

☐ D the height of the body

(b)

Explain why it is important that the internal conditions of the body are kept within narrow limits.

Question 2

5 marks

A nurse measured the mass and height of a patient at a diabetes clinic.

Measurement Value
Mass 86 kg
Height 1.72 m

The nurse used this equation.

BMI=mass (kg)(height (m))2\text{BMI} = \frac{\text{mass (kg)}}{(\text{height (m)})^2}

The table below shows how BMI values are classified.

BMI Classification
below 18.5 underweight
18.5 to 24.9 normal weight
25.0 to 29.9 overweight
30.0 and above obese
(a)

Calculate the BMI of this patient.

Give your answer to one decimal place.

(b)

Use the classification table to state the classification of this patient.

(c)

The patient changed his diet and took more exercise. His height stayed the same and his BMI fell to 24.8.

Calculate the mass, in kg, that this patient lost.