Breaking out in a sweat T7 Flashcards

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1
Q

Explain how body temperature is maintained during a period of intense exercise, with reference to each stage within the homeostatic control mechanism.
(5)

A
  • Temp increases above normal level.
  • This is detected by thermo-receptors in skin/the hypothalamus.
  • Impulses pass to hypothalamus.
  • Heat loss centre activated.
  • Impulses sent to sweat glands.
  • Evaporation of sweat causes a cooling effect.
  • Impulses sent to shunt vessels in the skin.
  • Shunt vessels constrict / vasodilation.
  • More blood flow through skin surface capillaries.
  • More heat loss via radiation.
  • Body temp. falls back to normal, via negative feedback.
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2
Q

What is meant by the term homeostasis.

1

A

Maintenance of a constant internal environment.

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3
Q

Define negative feedback.

1

A

When an increase/decrease in the norm triggers mechanisms to return the body back to normal.

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4
Q

Why is it important that core temperature remains stable?

A
  • Allows a stable rate of enzyme controlled reactions.
  • Temp. too low, there is an insufficient concentration of kinetic energy, enzyme and substrates less likely to move and form substrate-complex.
  • Temp too high, enzymes denature.
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