Module 1- Introduction to Phys

Question 1

what is physiology?

Answer 1

• study of function of living organisms

- how we do homeostasis

Question 2

what is the internal environment referring to?

Answer 2

• the interstitial fluid that cells are bathed in

- also includes blood plasma

Question 3

what is negative feedback?

Answer 3

1) set point (ex. body temp should be 37 deg)
2) sensors detect if it is not at set point (ex. lower temp)
3) control center activates EFFECTORS to influence a CONTROLLED VARIABLE to reach set point (ex shivering to generate heat)
4) sensors detect once set point is reached and control center stops effector from changing the variable (stop shivering)
SUMMARY: the controlled v. turns off its own production by the effector thru the sensors to control center

Question 4

what is positive feedback?

Answer 4

• controlled v. STIMULATES own production
• variable detected by sensor, tells control center to produce more by effector.
• allows LOTS of variable to be produced at once

Question 5

what two systems are required to control the -ve and +ve feedback systems?

Answer 5

• the nervous system

- the endocrine system