Communication and Homeostasis Keywords

A list of keywords and their definitions for the communication and homeostasis section of the OCR A2 Biology course

HideShow resource information

Stimulus

Stimulus

A change in the environment that causes a response

E.g An increase  in temperature

1 of 12

Homeostasis

Homeostasis

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

E.g Body Temperature

2 of 12

Excretion

Excretion

The removal of metabolic waste from the body

E.g Sweating

3 of 12

Endotherms

Endotherms

An organism that can use internal sources of heat e.g metabolism from liver

E.g Human

4 of 12

Response

Response

A change in behaviour or physiology as a result of the stimulus

E.g Sweating - after raise in temperature

5 of 12

Negative feedback

Negative Feedback

A process that brings about the reversal of any change in conditions

E.g Too hot => sweat => cool down

6 of 12

Sensory receptor

Sensory Receptor

Something that recognises the change in conditions

E.g Baroreceptor (blood pressure)

7 of 12

Ectotherms

Ectotherms

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

E.g Snake

8 of 12

Cell signalling

Cell signalling

Where one cell releases a chemical that is detected by a second cell which will then respond

E.g Neuronal & Hormonal

9 of 12

Positive Feedback

Positive Feedback

A process that increases any change detected by receptors

E.g Childbirth

10 of 12

Oxytocin

Oxytocin

A hormone involed in increasing uterine contractions

E.g childbirth

11 of 12

Temperature Regulation

Temperature Regulation

Ensuring that temperature remains at a fairly constant rate

E.g Negative Feedback

12 of 12

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Cellular processes and structure resources »