Homeostasis

Question 1

Homeostasis

Answer 1

Dynamic constancy of the body’s internal environment

Question 2

1. Ensures cellular fluid environment:

Answer 2

1. Has optimum concentration of nutrients, ions, gases, water

Question 3

2. Ensures cellular fluid environment

Answer 3

2. Stays at constant temperature for normal cell functioning

Question 4

3. Ensures cellular fluid environment:

Answer 4

3. Is maintained at optimum pressure

Question 5

Homeostasis regulates:

Answer 5

1. Body temperature
2. pH and concentration
3. Blood pressure
4. O2 and CO2 concentration
5. Glucose concentration
6. Metabolic waste concentration

Question 6

1. Homeostatic mechanisms controlled by:

Answer 6

1. Nervous system (nerves): sends messages to organs to counteract change

Question 7

2. Homeostatic mechanisms controlled by

Answer 7

2. Endocrine system (hormones): secretes hormones which work slower

Question 8

Stimulus

Answer 8

Change in environment

Question 9

Receptor

Answer 9

cells that detect change

Question 10

Modulator

Answer 10

control centre that processes and relays information to effects

Question 11

Effector

Answer 11

Tissues/glands instructed to adjust output to cause an effect

Question 12

Response

Answer 12

Outcome of the adjustments

Question 13

Feedback

Answer 13

Response changes original stimulus

Question 14

Negative Feedback system

Answer 14

Produces response opposite to original change

Question 15

Positive Feedback system

Answer 15

Produces response that reinforces and intensifies original stimulus

Question 16

Positive feedback examples

Answer 16

Childbirth, blood clotting or high fever

Question 17

1. Response

Answer 17

Physiological: automatic

Question 18

2. Response

Answer 18

Behavioural: Voluntary

Question 19

Dynamic

Answer 19

Is active in the maintainence