Homeostasis

Question 1

Explain the importance of physiological control systems

Answer 1

If disruption is too severe or homeostasis is crucial to survival, death will result
BALANCE

Question 2

Explain the meaning of homeostasis

Answer 2

Physiological control systems maintain a relatively stable internal environment (i.e., within safe limits or a “normal range”) in a fluctuating environment

Question 3

Example of negative feedback

Answer 3

blood pressure

Thermoregulation

Question 4

Example of positive Feedback

Answer 4

Blood clotting

Oxytocin

Question 5

Example of feedforward control

Answer 5

Digestive system

Question 6

What percentage of fluid is ECF and ICF

Answer 6

70%ICF

30%ECF

Question 7

Nervous response to homeostasis

Answer 7

quick, short duration response

Question 8

endocrine response to homeostasis

Answer 8

long, longer duration response

Question 9

Open Loop:

Answer 9

controller - controller component - output
THIS OUTPUT NOT INFLUENCED BY RESULTING CONDITIONS
Can result in run away reactions if there is no termination

Question 10

Closed Loop:

Answer 10

Controller - controller component - output - sensor - feedback - controller
INFLUENCED BY RESULTING CONDITIONS

Question 11

negative feedback

Answer 11

returns to set point

Question 12

feedforward

Answer 12

response is generated in anticipation of change

Question 13

positive feedback

Answer 13

moves away from set point

Question 14

negative feedback control of arterial BP

Answer 14

baroreceptors (stretch receptors in carotid arteries and aortic arch) are SENSOR
nucleus in medulla oblongata references set point and notices change in bp CONTROL CENTRE
EFFECTORS
CONTROLLED = rise or fall in BP
SENSOR

Question 15

Gain

Answer 15

degree of effectiveness of a negative feedback control system
= Correction/error