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15 Cards in this Set

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Homeostasis

The maintenance of the internal environment in a constant state despite external changes.

External

Negative feedback

A process that brings about a reversal of any change in conditions to bring it back to the optimum. It leads to homeostasis.

Positive feedback

A process that increases any change detected by receptors. It tends to be harmful.

Ectotherm

An organism that relies on external sources of heat to regulate its body temperature.

Endotherm

An organism that can use internal sources of heat such as from metabolic reactions to regulate body temperature.

Hypothalamus

Measures temperature of blood and causes negative feedback reaction.

Peripheral temp receptors

Are located in the extremeties and are an early warning system to the hypothalamus.

Sensory neurone

Carries action potential from sensory receptors to the CNS

Motor Neurone

Carries action potential from CNS to muscle effector

Sensory receptors

Specialised cells that can detect changes in surroundings. Are energy transducers.

Stimulus

Change in energy levels in the environment that causes a response

Polarised membrane

Has a potential difference across it. This is the resting potential.

Depolarisation

The loss of polarisation across the membrane of an axon. When the inside is less negative compared to the outside.

Generator potential

A small depolarisation caused by sodium ion channels opening and Na+ entering the cell.

Action potential

Is achieved when the membrane is depolarised to +40mv. It is an all or nothing reaction.