Chapter 1- Homeostasis

Question 1

Homeostasis

Answer 1

constancy of the internal environment. Provides us a framework to understand physiological processes.

Question 2

Negative Feedback

Answer 2

ability to detect change and enact mechanisms to resist that change. High or low

Question 3

Set Point

Answer 3

average level (heart rate for example

Question 4

Dynamic constancy

Answer 4

subtle fluctuations around a set point

Question 5

Steps in a Negative Feedback Loop

Answer 5

Stimulus (the change)
Sensor (detects stimulus)
Integrating Center (usually brain or spinal cord. Makes an action occur)
Effector (carry out final corrective action)
Negative feedback response (action that fixes the problem)

Question 6

Two forms of Homeostasis Regulation

Answer 6

Intrinsic and Extrinsic

Question 7

Intrinsic Homeostasis Regulation

Answer 7

Cells within the organ sense a change and signal to neighboring cells to respond appropriately
(auto regulation built in

Question 8

Extrinsic Homeostasis Regulation

Answer 8

The brain regulates an organ using the endocrine or nervous system
(Multiple organs involved. Tart organs innervated (has nerves). have hormone receptors)

Question 9

Hormone secretion of the pancreases. Intrinsic or extrinsic?

Answer 9

Intrinsic

Question 10

Insulin and glucagon

Answer 10

antagonistic hormones

Question 11

Positive Feedback

Answer 11

self-amplifying. Increasing away from something. away from set point. Labor, oxytocin released from pressure on cervix causing uterus to contract and increase pressure on cervix. Blood clotting. Protein digestion.

Question 12

Gradient

Answer 12

Difference between one point and another. Down a hill: with the gradient. Up a hill: against the gradient

Question 13

Electrical gradient

Answer 13

positive and negative charges