________: Long fiber that allows a quicker carrying process from neuron to neuron.
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Lens
A transparent disc that changes its shape through accommodation with the help of the suspensory ligaments and ciliary muscles to regulate the light that enters the retina.
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Relay neurons
________: Impulses can travel both ways.
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Motor neurons
________: From the central nervous system towards effectors (muscles and glands)
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Presynaptic neuron
________: Has vesicles that are carrying the neurotransmitters, the vesicles are triggered by the electrical impulse.
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Photoreceptors
________ detect the change in the environments light conditions.
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Dendrites
________: Extensions that mainly receive and improve synaptic neuronal communication.
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Sensory neurons
________: From sense organs to the Central Nervous System.
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In dim light the pupil....
dilates to enter as much light as possible.
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Lens
The ________ is elastic and has a changing shape, relying on how tight the suspensory ligaments are.
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optic nerve
A neve that carries impulses from the retina towards the brain, producing the images.
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In bright light the pupil...
constricts preventing too much light entering and damaging the retina.
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Postsynaptic neuron
________: Has receptors with whom specific neurotransmitters bind.
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reflex
a(n) ________ is an involuntary action, co ordinated by the CNS, that responds to a stimulus and is automatic.
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what happens to neurotransmitters that do not bind?
are uptaken again into the presynaptic neuron, or broken down by enzymes.
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lens accommodation
The change in ________ is mainly causes bythe relaxation or contraction of the ciliary muscles.
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Define the term sense organ
A sense organ is a group of tissues with the same task that contain a bunch or sensory neurons and rreceptor for specific stimuli. They are mainly known for the 5 senses.
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List three parts of the eye that light passes through to reach the retina
Pupil, Cornea, and Lens.
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Reflex arc
stimulus, receptor, sensory neuron, relay neuron, motor neuron, effector, repsonse
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Central
The brain and spinal chord form the ________ nervous system
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Peripherical
The nerves coming into and out of the spinal chord are part of the ________ nervous system.
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Antagonistic response
State the term that describes the action of a pair of muscles working in opposition to each other.
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