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STARTER Can you label me?
• Words that might help:• Dendrite• Nucleus• Axon• Node of Ranvier• Myelin sheath• Cell body
Dendrite
DendriteCell body
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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.
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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!
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Now complete the first part of your worksheet!
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3 main types of nerve cells
sensory neurone
relay neurone
motor neurone
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Different Sense Organs
Soundmechanoreceptor
Lightphotoreceptor
Chemicals in foodchemoreceptor
TemperaturethermoreceptorPressureMechanoreceptor
Chemicals in the airchemoreceptor
Now complete the third part of your worksheet!
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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
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Relay neuron
Carries impulses from sensory nerves to motor nerves.
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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
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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!
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Now complete the fifth part of your worksheet!
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Now have a go at the Reflex arc puzzle!
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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
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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