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Flashcards in Topic 1 Deck (18)
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1
Q

Physiology

A

study of how the body functions

2
Q

Homeostasis

A

ability to maintain relatively stable conditions in the internal environment

3
Q

Conditions that need to be controlled to maintain homeostasis

A
  • pH
  • temp
  • blood gases (CO2, O2)
  • blood pressure
  • ICF and ECF fluid volumes
4
Q

Disease

A

failure to maintain homeostasis

5
Q

Control centres for homeostasis

A

endocrine and nervous system

6
Q

Control centres for homeostasis do what

A
  • maintain homeostasis

- permit departures from homeostasis in controlled manner (pregnancy)

7
Q

2 types of NS/endocrine responses

A
  • anticipatory responses

- feedback mechanisms

8
Q

Example of anticipatory responses

A

rise in respiratory rate at start of exercise = proprioceptors single movement before a change in internal conditions

9
Q

Anticipatory responses may be ..

A

learned or behavioural

10
Q

Feedback mechanism

A

mechanisms that respond to change in a system

11
Q

Feedback mechanisms consist of ..

A

set points, receptors, control areas, and effectors

12
Q

Set point

A

range of values of a variable (body temp) that do not bring about a response

13
Q

Steps of feedback mechanisms

A

variable is monitored by receptors –> info fed back to control area –> controls the effector

14
Q

Types of feedback mechanism

A
  • negative feedback

- positive feedback

15
Q

Negative feedback

A

most common homeostatic control method. result of “output”, variable moves back toward the set point

16
Q

Example of negative feedback

A

body temp (variable) set point 36-38, if increase temp core blood to skin surface and sweat evaporates = increase heat lose and decrease temp

17
Q

Positive feedback

A

less common, NOT homeostatic, output intensifies the input, continues until endpoint

18
Q

Example of positive feedback

A

childbirth