Homeostasis

Question 1

Define homeostasis.

Answer 1

The maintenance of a constant internal environment within the body.

Question 2

What is negative feedback?

Answer 2

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

Question 3

Define vasodilation.

Answer 3

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

Question 4

Define vasoconstriction.

Answer 4

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

Question 5

Define gravitropism.

Answer 5

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

Question 6

Define phototropism.

Answer 6

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

Question 7

Define auxin.

Answer 7

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