Slides in this set

Slide 1

Preview of page 1

Types of nerve cell 14
Nucleus Cell body Muscle strands
Nerve cells (neurones) are elongated with branched
endings to connect to many muscles fibres or other
nerve cells.
1) Motor neurone 2) Sensory neurone 3) Relay neurone
Impulse Impulse…read more

Slide 2

Preview of page 2

Conscious actions 14
A conscious action is one where the brain makes a considered response.
Here's what happens:
4) The brain
3) Here another sensory neurone decides to move
carries the signal to the brain away the hand
5) This impulse is
2) The impulse is carried sent by MOTOR
to the spinal chord hand muscles (the
effectors) via the
spinal chord...
1) Receptors in
your skin detect
6) Which then
a stimulus
moves the hand
Stimulus Receptor Sensory Neurone Coordinator
Motor Neurone Effector Response…read more

Slide 3

Preview of page 3

Reflex actions 14
Sometimes conscious action is too slow to prevent harm, e.g...
In situations like this
the body bypasses the
brain to produce a
quicker response.
Here's how it works...…read more

Slide 4

Preview of page 4

Reflex actions 14…read more

Slide 5

Preview of page 5

Synapses 14
Neurones never touch each other ­ there is a small gap
between them called a SYNAPSE. A signal is sent from one
neurone to the next by a chemical transmitter across the
synapse. These transmitters are then destroyed.…read more


lisa linsdell

PP Presentation that covers the relex arc etc, some good diagrams to help aid revision.

Similar Science resources:

See all Science resources »See all resources »