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Animal Physiology, Reproduction and developement > Homeostasis > Flashcards

Flashcards in Homeostasis Deck (16)
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1

What is homeostasis?

Any self regulating process by which biological systems maintain stability whilst adjusting to variable environmental conditions

2

What is a steady state?

The internal environment is stable, not static, in a dynamic equilibrium. Change occurs but relatively uniform conditions prevail

3

Why is it important to maintain a steady state?

External environments vary and some external conditions would be lethal to individual cells. Internal processes also require certain conditions to successfully function

4

What is a receptor?

Measures the internal environment

5

What is the control centre?

Sends a message to the effector via nervous or endocrine system when parameter exits normal range

6

What is a stimulus?

Fluctuations in variables away from the normal

7

What is negative feedback?

A response that reduces it damps a stimulus

8

What is positive feedback?

Relatively rare,always parts of larger negative feedback system, trigger mechanisms that amplify rather than diminish the stimulus

9

What is torpor?

A state of mental or physical inactivity, heart rate and temp falls

10

What are the side effects of doping?

Body is trying to get back to a steady state

11

What are the reasons for using performance enhancing drugs?

Build muscle mass and strength
Increase O2 delivery to exercising tissue
Mask pain/injury
Decrease weight
Hide use of other drugs

12

What is erythropoietin? (EPO)

Hormone that stimulates erythrocyte protein released by the kidney

13

What is the stimuli for erythropoietin?

Low atmospheric oxygen, high levels of exercise, haemorrhaging

14

What are the benefits of EPO doping?

Increases supply by 7-10%, used to increase erythrocyte levels which means greater oxygen delivery to muscles

15

What are the side effects of EPO doping?

Blood thickens, heart has to work harder so there is an increased risk o heart attack or stroke

16

What is meldonium?

Drug used to treat coronary heart disease, increases blood flow and oxygen flow