Thermoregulation –
SB8.9w Strengthen
Name Joanna Ooi Class 10E Date 27th April 2023
1 The diagram shows structures in the skin. Label the diagram with the names of the structures.
hair
temperature receptors
hair erector muscle
epidermis
blood capillary
dermis
fatty tissues
1 Describe how each of the following changes when the body temperature falls too low.
a blood flow near skin surface ___________________________________________________________
lesser (reduces)
b body hair position ___________________________________________________________________
stands up
c body muscle activity _________________________________________________________________
contracts (shiver)
S1 Draw a sketch to show the changes in the body when body temperature falls too low.
2 Explain why the changes described in questions 2a and 2c help to raise body temperature when it is too low.
blood flow near skin surface ______________________________________________________________
reduces heat loss from the warm blood through the skin
_________________________________________________________________________________________
contracts to constrict blood vessels & produces heat from energy (warm
body muscle activity ____________________________________________________________________
tissues)
_________________________________________________________________________________________
3 Circle the name of the part of the body that monitors changes in temperature inside the body.
pituitary gland skin hypothalamus muscles
4 Name the skin structure that detects changes in temperature outside the body.
temperature receptors
_________________________________________________________________________________________
5 Circle the normal temperature in the core (around the heart and liver) of the human body.
34 °C 36 °C 37 °C 38 °C 43 °C 73 °C
6 a When body temperature gets too high, one change in the skin is related to blood flow. Describe one
other change that increases heat transfer to the environment.
sweating (evaporation)
__________________________________________________________________________________
b Explain why the temperature of the main organs in the body is kept steady.
to provide the optimum temperature for enzymes to function
__________________________________________________________________________________
__________________________________________________________________________________
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