F214 Module 1 - Communication And Homeostasis

Question 1

Homeostasis

Answer 1

Maintenance of the internal environment in a constant state despite external changes

Question 2

Negative feedback

Answer 2

A process that brings about a reversal of any change in conditions, to ensure an optimum steady state can be maintained.

Question 3

Positive feedback

Answer 3

Process that increases any change detected by the receptors.

Question 4

Ectotherm

Answer 4

Organism that relies on external sources of heat to regulate it’s body temperature.

Question 5

Endotherm

Answer 5

Organism that can use internal sources of heat, such as that generated by metabolism in the liver, to maintain its body temperature.

Question 6

Generator potential

Answer 6

A small depolarisation caused by sodium ions entering the cell

Question 7

Action potential

Answer 7

Achieved when the membrane is depolarised to a value of +40mV. All or nothing response. To reach it? The membrane depolarised and reaches a threshold level, then sodium ions enters the axon and an action potential is reached.

Question 8

Stimulus

Answer 8

Any change in the environment that causes a response