Homeostasis

Question 1

Homeostasis

Answer 1

The condition of equilibrium (balance) in the body’s internal environment maintained by the body’s own regulatory processes

Question 2

What physiological variables must be kept within narrow parameters (homeostatic balance) in the body?

Answer 2

1. Core body temp
2. Water & electrolyte concentration
3. pH of body fluids
4. Bloody glucose levels
5. Blood & tissue o2/co2 levels
6. Blood pressure
7. Flow of life force

Question 3

Homeostatic control systems are made up of:

Answer 3

1. Disruptors - changes
2. Detectors
3. Control centre - determines limits
4. Effectors - receives output

Question 4

What is a Feedback system

Answer 4

A group of receptors & effectors communicating with their control centre

Question 5

Negative feedback term

Answer 5

Where the output reverses the input

Effector responses decreases the effect of the stimulus, works like a central heating system

Question 6

Positive feedback term

Answer 6

Strengthens/reniforces change in one of the body’s controlled conditions
Stimulus progressively increases the response as long as the stimulus continues

Question 7

Examples of negative feedback systems

Answer 7

Body temp
Blood glucose levels
Blood pressure

Question 8

Egs of positive feedback systems

Answer 8

Child birth
Milk production
Enzyme reactions
Immunity
Blood clotting

Question 9

What is the lymphatic system

Answer 9

The interconnected system of spaces & vessels between body tissues & organs by which lymph circulates throughout the body