Negative Feedback and Homeostasis

Question 1

What is homeostasis?

Answer 1

Maintenance of a constant internal environment.

Question 2

Give 4 things that homeostasis is needed to regulate.

Answer 2

Control of blood glucose
Control of blood water potential
Control of temperature
Control of blood pH

Question 3

Name 2 systems in the body that regulate homeostasis.

Answer 3

Nervous and endocrine

Question 4

Compare the speed of response of the endocrine and nervous system.

Answer 4

Endocrine is slower but effects are longer lasting

Question 5

Give 3 effects that hormones can have on a cell.

Answer 5

Change membrane permeability
Release a second messenger
Promote or inhibit transcription

Question 6

What is negative feedback?

Answer 6

A series of changes that result in a condition or amount of something to be restored back to its optimum level.

Question 7

What is positive feedback?

Answer 7

Returns body away from the optimum. Occurs after a change from optimum that causes even greater change than usual.

Question 8

Give some examples of negative feedback that occur when body temperature is too low.

Answer 8

Vasoconstriction, shivering, goosebumps, no sweating, increased metabolism

Question 9

Give some examples of negative feedback that occur when body temperature is too high.

Answer 9

Vasodilation, sweating