STARTER Can you label me?

• Words that might help:• Dendrite• Nucleus• Axon• Node of Ranvier• Myelin sheath• Cell body

Dendrite

DendriteCell body

Nervous System• Describe the transmission of impulses from

senses to central nervous system and back to muscles.

• Describe the reflex action and the pathway of the reflex arc.

• Describe the function of reflex response.

• Describe the role of the central nervous system.

Can you label me?

• Words that might help:• Dendrite• Nucleus• Axon• Node of Ranvier• Myelin sheath• Cell body

Dendrite

DendriteCell body

Nucleus

Dendrite

Cell body

Axon

Myelin sheath

Node of Ranvier

Now complete the second part of your worksheet!

Now complete the first part of your worksheet!

3 main types of nerve cells

sensory neurone

relay neurone

motor neurone

Different Sense Organs

Soundmechanoreceptor

Lightphotoreceptor

Chemicals in foodchemoreceptor

TemperaturethermoreceptorPressureMechanoreceptor

Chemicals in the airchemoreceptor

Now complete the third part of your worksheet!

Sensory neurons

Carries impulses from receptors e.g pain receptors in skin to the CNS( brain or spinal cord)

Complete the fourth part of your worksheet as we move through the next few slides

Relay neuron

Carries impulses from sensory nerves to motor nerves.

Motor neuron

Carries impulses from CNS to effector e.g. muscle to bring about movement or gland to bring about secretion of hormone e.g ADH

Receptors and Sense Organs

Effector e.g. muscle

Sense organs detect stimuli

Nerve impulse

CNS

Nerve impulseThis is known as a

REFLEX ARC

This is how your body makes subconscious movements!

Now complete the fifth part of your worksheet!

Now have a go at the Reflex arc puzzle!

2 – Flow Of Information

Effector e.g. muscle

Sense organs detect stimuli

Sensory nerves

CNS-relay neurones-if conscious decisions made then using neurones in cerebrum

Motor neurones

stimuli

GROUP ACTIVITY:What process happens in your body?

• If you are reading a book and it gets too dark to see it clearly?

• If you accidentally touch a hot saucepan lid

• If you are walking down the street and smell an overflowing drain