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IGCSE Biology Extended14.4.1—Homeostasis as the maintenanceTopic Practice

14.4.1—Homeostasis as the maintenance

• Describe homeostasis as the maintenance of a constant internal environment

Question 2(a)(i)

[Maximum number: 1]

Fig. 2.1 shows the internal body temperature of a human and the external environmental temperature during six hours in one day.

Fig. 2.1

Fig. 2.1

key: internal body temperature
- - - external environmental temperature

The internal body temperature range is from 36.4∘C36.4^{\circ} \mathrm{C} to 37.0∘C37.0^{\circ} \mathrm{C}.

State the range of the external environmental temperature shown in Fig. 2.1.

Question 4(c)

[Maximum number: 4]

The flow of blood through the skin can be investigated by using a flow-meter.
Fig. 4.1 shows a flow-meter above a section through the skin.

Fig. 4.1

Fig. 4.1

Explain the importance of regulating body temperature in humans.

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