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Emily Willman Ch.25 SV
Emily Willman Ch.25 SV
18
Science
7th Grade
01/08/2014

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Term
Central Nervous System
Definition
Includes brain and spinal cord- Processing all incoming and outgoing messages.
Term
Peripheral Nervous System
Definition
Consists of communitcation pathways, or nerves, that connect all all areas of your body to your CNS.
Term
Neuron
Definition
Cells that transfer messages throughout your body in the form of fast moving electrical energy.
Term
Impulse
Definition
The electrical messages that pass along the neurons.
Term
Receptor
Definition
Specialized dendrites that detect changes inside and outside the body.
Term
Nerves
Definition
Axons bundled together with blood vessels and connective tissue
Term
Brain
Definition
The nervous systems largest organ that controls most movement and change in the body.
Term
Reflex
Definition
an involuntary action that that helps protect your body from danger.
Term
Retina
Definition
A light-sensitive layer in the back of the eye.
Term
Rods
Definition
the photoreceptor that can detect dim light.
Term
Cones
Definition
Detect bright light- Let you see color
Term
Iris
Definition
The part of the eye that gives the eye color.
Term
Lens
Definition
A piece of curved material behind the pupil that allows light ot pass through but changes it direction.
Term
Cochlea
Definition
A tiny snail-shaped organ of the inner ear.
Term
Endocrine System
Definition
Involved with the slower, long-term processes, such as fluid balance, growth, and sexual development.
Term
Gland
Definition
A group of cells that makes special chemicals for your body.
Term
Hormone
Definition
Chemicals that are produced by the endocrine glands.
Term
Feedback Control
Definition
Special systems that turn endocrine glands on and off.
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