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Nervous System

Nervous system and Eye

What is a neuron? a nerve cell
What is a dendrite? branches bringing information towards a neuron
What is an axon? the long branch taking information away from a neuron
What is a synapse? the space between the axon of one neuron and a dendrite
How does information from a nerve cross a synapse? the axon terminals release neurotransmitters (chemicals)
What is the function of a nervous system? gather information from the environment and respond(coordinate movements) or store information as memory/learning
How do synapses change as learning occurs? they can get more receptors, get better at releasing more neurotransmitters and increase the number of synapses between the axon and dendrite
If a neural pathway isn't used then what can happen to it? It can weaken. Sometimes the synapses will get lost.
What are the parts of the human central nervous system? Brian and spinal cord
What are the parts of the human peripheral nervous system? nerves
What is a withdrawal reflex? an automatic response to pain and other stimuli due to nerve impulses through the spinal cord
What is more reliable - a nerve impulse or neurotransmitters crossing a synapse? A nerve impulse is more reliable, since the neurotransmitters don't always make it across the synapse, or not enough make it.
What part of the brain is the main "thinking", decision making and memory area? cerebrum
What part of the brain is the main "movement" center? cerebellum
What part of the brain controls automatic body processes medulla (brain stem)
What happens as muscle memory develops? the brain learns how to control many movements simultaneously as an automatic neural pathway
How many senses do we have? MANY more than 5, including pain, pressure, temperature, hunger, etc.
transparent covering in front of the eye, curved to focus light through the pupil cornea
white covering of the eye sclera
opening through which light enters pupil
colored ring of muscle that controls pupil size iris
watery liquid in the eye aqueous humor
muscles that attach to the ciliary muscle
jelly-like fluid in the eye vitreous humor
thick disc, focuses the images on the retina lens
thin tissue at the back of the eye; contains photoreceptors (rods for light, cones for color) retina
layer of tissue behind the retina with a lot of blood vessels to nourish the eye with nutrients and oxygen choroid
place where retina enters optic nerve, and nothing will be seen at that spot (but your brain "fills" it in) blind spot
the shiny reflective layer behind the retina in some animals that give "night vision" tapetum
cord-like structure that carries information from the eye to the brain for processing optic nerve
Created by: jenhaugen01