Homeostasis Flashcards

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1
Q

Define homeostasis:

A

The maintenance of a constant internal environment.

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2
Q

Give 3 processes that happen when someone is too cold:

A

-Hair stands on end
-Less sweat released
-Vasoconstriction

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3
Q

Define vasoconstriction:

A

Arterioles supplying the capillaries near the surface of the skin get narrower - they constrict. Less blood will flow through, therefore less heat is lost by radiation.

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4
Q

Give 3 processes that happen when someone is too hot:

A

-Hair lies flat
-More sweat is released
-Vasodilation

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5
Q

Define vasodilation:

A

Arterioles supplying the capillaries near the surface of the skin get wider - they dilate. More blood will flow through the capillaries near the surface of the skin, therefore more heat will be lost by radiation.

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6
Q

How does hair standing on end help warm someone up when they’re cold?

A

The hairs trap a layer of air which provides insulation for the conduction of heat.

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7
Q

How does hair lying flat help cool someone up when they’re hot?

A

Hair lies flat and therefore an insulating layer of air is not formed.

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