STARTER Can you label me? Dendrite • Words that might help: • Dendrite • Nucleus • Axon • Node of Ranvier • Myelin sheath • Cell body Dendrite Cell body
Nervous System • Describethe transmission of impulses from senses to central nervous system and back to muscles. • Describethe reflex action and the pathway of the reflex arc. • Describethe function of reflex response. • Describethe role of the central nervous system.
Can you label me? Dendrite Dendrite Myelin sheath • Words that might help: • Dendrite • Nucleus • Axon • Node of Ranvier • Myelin sheath • Cell body Nucleus Axon Cell body Node of Ranvier Dendrite Cell body Now complete thesecondpart of yourworksheet!
3 main types of nerve cells sensory neurone relay neurone motor neurone
Now complete thethirdpart of yourworksheet! Different Sense Organs Sound mechanoreceptor Light photoreceptor Chemicals in food chemoreceptor Temperature thermoreceptor Pressure Mechanoreceptor Chemicals in the air chemoreceptor
Complete thefourthpart of yourworksheet as wemovethroughthenextfewslides Sensory neurons Carries impulses from receptors e.g pain receptors in skin to the CNS( brain or spinal cord)
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
Sense organs detect stimuli Nerve impulse CNS Nerve impulse Receptors and Sense Organs This is known as a REFLEX ARC This is how your body makes subconscious movements! Effector e.g. muscle
Sense organs detect stimuli stimuli Sensory nerves CNS -relay neurones -if conscious decisions made then using neurones in cerebrum Motor neurones 2 – Flow Of Information Effector e.g. muscle
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