Coordination and Response

Sensitivity

Ability to detect changes in their environments and respond to these changes.

The change that stimulates the response

Stimulus

Types of stimulus

External stimulus and internal stimulus

External stimulus

Stimuli from the external environment include light, sound smell, taste, surrounding temperature, pressure and touch.

Internal stimulus

Stimuli from the internal environment include changes in blood osmotic pressure, changes in body temperature and changes in blood sugar level.

Receptor

Special sensory cells to detect stimuli

Nerve impulses in coordination and response

When a receptor detects a stimulus it is converted to a nerve impulse that is sent to the brain through nerve cells or neurons.

Neuron

Also known as nerve cells that process and transfer information to the brain.

Brain function in coordination and response

The integration centre translates nerve impulses and coordinates an appropriate response.

Responses in body coordination

Refers to the way organisms react after detecting a stimulus.