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Coordination and response - Coggle Diagram
Coordination and response
Nervous System
Neurones
what the nervous system is made of
Motor Neurone
Cell Body
Cytoplasm
Nucleus
Cell membrane
Ribosomes
Dendrite
Short fibres of cytoplasm that extends from the cell body of a neurone
Mithoccondrion
Axon
Nucleus of cell
Makes myelin sheath
Nerve Ending
Myelin Sheath
A layer of fat that is useful to carry the impulses faster
A long, thin, fibre of cytoplasm that extends from the cell body of a neurone
Cell that conducts electrical impulses rapidly
photo 1
Impulses travel through it
Types of nervous systems
Central nervous system (CNS)
Spinal cord
Brain
Peripheral nervous system (PNS)
Nerves outside the brain and spinal cord
Reflex Arcs
A series of neurones (sensory, relay and motor) that transmit electrical impulses for a receptor to an effector. (page 238)
Relay Neuron
Motor Neurone
Sensory Neuron
photo 2
photo 3
Reflex action
The reaction that happens after the impulse created by the reflex arc
Automatic action that happens unconsciously
photo 4
The electric impulse travels to your muscle making it contract and react very fast
Synapsis
The junction between 2 neurones
Photo 5
Sense Organs
A group of receptor cells that are able to respond to a specific stimulis (Light, sound, touch, temperature and chemicals)
Eye
Reacts to light
Structure of the eye
Lens
Focuses the light on the retina
Retina
Light receptors, someones sensitive of light of different colous
Iris
Controls how much light enters to the pupil
Optic nerve
Carries the impulses of the retina to the brain
Cornea
Refracts the light
Photo 6
Pupil reflex
An automatic response to a change in light intensity; the receptors are in the retina, and the effector is the muscle of the iris
photo 7
photo 8
Antagonistic muscles
A pair of muscles whose contraction has opposite effects; when one contracts, the other relaxes
Rods and Cones
Receptor cells of the retina
fovea
The part of the retina where cone cells are very tightly packed; this is where light is focused when you look directly at an object
Cones
receptor cells in the retina that are sensitive to light of different colours, but only function in bright light
function best in bright light
three types of cone cells
blue cones
Green cones
red cones
Rods
Receptor cells in the retina that respond to dim light, but do not detect colour
don't detect color
very sensitve to light
