Biology Module 5 Communication And Homeostasis

Front 1

- detect stimuli
- are specific, so only detect one particular stimulus
- can be whole cells and proteins on cell surface membranes

Back 1

- receptors detect when a level is too high or too low

- this information is communicated to the effectors

- the effectors respond to counteract the change, bringing the level back to normal

Front 2

- bring about a response to a stimulus
- can be muscle cells and cells found in glands

Back 2

- receptors detect when a level is too high or too low

- this information is communicated to the effectors

- the effectors respond to further increase the level away from the normal level

Front 3

- happens when receptors need to communicate with effectors

- can occur between adjacent cells or between distant cells
- cell-surface receptors allow cells to recognise the chemicals involved in cell signalling

Back 3

- transmit nerve impulses from receptors to the central nervous system

- have short dendrites and one long dendron

- have one short axon

- cell body is outside the CNS

Front 4

- involves control systems that keep your internal environment constant within certain limits

- vital for cells to function normally and to stop them being damaged

Back 4

- transmit nerve impulses from the central nervous system to the effectors

- have many short dendrites and no dendron

- has one long axon

- cell body is inside the CNS