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The diagram shows a sweat gland in a section of skin - Edexcel - GCSE Biology - Question 1 - 2013 - Paper 1
Question 1
The diagram shows a sweat gland in a section of skin. (a) Explain how the sweat gland helps to cool the body. (b) Draw one straight line from the definition to the... show full transcript
Worked Solution & Example Answer:The diagram shows a sweat gland in a section of skin - Edexcel - GCSE Biology - Question 1 - 2013 - Paper 1
Step 1
Explain how the sweat gland helps to cool the body.
Answer
The sweat gland plays a critical role in thermoregulation. When the body temperature rises, sweat is produced and released onto the surface of the skin. As the sweat evaporates, it absorbs heat from the body, which helps to cool it down. This process is vital for maintaining an optimal internal temperature, especially during hot weather or intensive physical activity.
Step 2
Step 3
Describe how body hair helps to control a person’s temperature on a cold day.
Answer
On a cold day, body hair serves to insulate the body. The hair erects by the contraction of small muscles, which traps a layer of air. This trapped air acts as an insulating layer, reducing heat loss from the body and helping to maintain warmth.