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Chapter 22 Sciene

The Nervous and Endocrine System

neuron working unit of the nervous system, made up of a cell body & branches called dendrites & axons
dendrite branch of neuron that recieves messages and sends them to the cell body
axon branch of neuron that carries messages, or impulses, away from the cell body
synapse small space between neurons, across which an impulse moves by mean sof a chemical release by the axon
central nervous system (CNS) division of the nervous system, containg the brain and spinal cord, which sorts and interprets information from stimuli
peripheral nervous system (PNS) division of nervous system, made up of all berves outside the CNS; connects the brain and spinal cord to the other parts of the body
cerebrum largest part of the brain, is divided into two hemispheres; controls the work of voluntary muscles, interprets impulses from the senses, and stores memory
cerebellum part of the brain that coordinates voluntary muscle movements and maintains balance and muscle tone; located behind and undet the cerebrum
brain stem part of the brain that controls heartbeat, breathing, and blood pressure by coordinating the involuntary movements of these functions; extends from the cerebrum and connects the brain to the spinal cord
reflex involuntary and automatic response to a stimulus that allows the body to respond without having ton think about what action to take
cochlea structire of thye inner ear that is shaped like a snail's shell and contains fluids that vibrate, sending impulses to the brain by the auditory nerve
olfactory cells nerve cells in the nasal passages that respond to gas molecules in the air and send impulses to the brain for the interpretation of odors
retina light-sensitive tissue at the back of the eye; contains rods and cones; impulses stimulated here pass ton the optic nerve, which carries them to the brain
taste buds major sensory receptors for taste taht are located on the tongue
hormone endocrine chemicals that are produced from glands directly into the bloodstream and affect target tissues
target tissues specific tissue affected by hormones;often is located in a part of the body distant from the gland that affects it
Created by: moduerr