GCSE Control of Body Temperature

Which molecules in the human body depend on body temperature being maintained at 37°C?

• Ions

• Lipids

• Carbohydrates

• Enzymes

Which area of the brain is responsible for monitoring and controlling body temperature?

• Cerebellum

• Cerebral cortex

• Medulla

• Hypothalamus

How does shivering help to increase body temperature? (Choose 2)

• Muscles contract

• Kinetic energy of muscles

• More respiration occurs which releases heat

• Vasodilation occurs

On a dry, hot day a marathon runner does not overheat. On a cooler, humid day her body will overheat. Why?

• More heat is transferred from the skin to the environment

• She will run faster on a cooler day

• Sweat cannot evaporate as easily on a humid day

• Sweat can evaporate more easily on a humid day

What happens to blood flow in skin capillaries when we are too cold?

• Increases

• Decreases

• Stays the same

• Speeds up

Which organ of the body contains receptors sensitive to environmental temperature?

• Skin

• Lungs

• Brain

• Hearts

An athlete's body temperature and skin surface temperature is monitored throughout a race.

As his core body temperature increases, his skin surface temperature decreases. Why?

• Vasoconstriction occurs

• The hairs on his skin stand up

• He is sweating

• He is shivering

The organ that monitors internal body temperature receives information about temperature from the skin. Which structures in the skin send impulses with this information?

• Capillaries

• Receptors

• Hairs

• Stimuli

The hypothalamus contains receptors which are sensitive to the temperature of _____________________.

• Blood

• Inhaled air

• Exhaled air

• The brain

What changes occur in the body when we get too cold? (Choose 2)

• Muscles relax

• Hairs on skin rise

• Blood vessels constrict

• Blood vessels dilate