Homeostasis Flashcards

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1
Q

Define homeostasis.

A

The maintenance of a constant internal environment within the body.

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2
Q

What is negative feedback?

A

Any change to the conditions in the system causes a response to reverse the change. e.g. sweating.

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3
Q

Define vasodilation.

A

The widening of blood vessels that causes more blood to flow in the skin capillaries, so more heat is lost from the body.

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4
Q

Define vasoconstriction.

A

The narrowing of blood vessels that causes less blood to flow in the skin capillaries, so less heat is lost from the body.

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5
Q

Define gravitropism.

A

Response in which parts of a plant grow towards, or away from, gravity.

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6
Q

Define phototropism.

A

Response in which parts of a plant grow towards, or away from, the direction from which light is coming.

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7
Q

Define auxin.

A

Plant hormone that affects the rate of elongation in shoots and roots, causing tropisms in response to stimuli.

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