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5 Parts of the Neuroglia..
Special type of supporting cell, Astrocytes, Forms the myelin sheath around central nerve fibers, Phagocytosis, Multiple Sclerosis
What is the microscopic space that seperates the axon of one neuron from the dendrites of another neuron?
Contraction of a muscle that causes it to pull away from an irritating stimulus is know as the what?
When a sstimulus acts on a neuron it..
increases the permeability of the stimulated point of its membrane to sodium iions
Functions of the Brain Stem..
Conduct sensory implulse from the spinal chord to higher centers of tehe brain, conduct morot impluses from the cerebrum to spinal cord, control heartbeat, respiration and blood vessel diameter
Functions of the Hypothalmus
Control the rate of heartbeat, control the constriction and dialation of blood vessels, control teh contraction of the stomach and intestines
What part of the brain helps in the association of sensations with emotions and aids in the arousal or altering mechanism?
Facts of the Cerebrum
lobes corrospond to the bones that lie over them, most of gray matter lies on the surface of the cerebrum, outer region is called the cerebral cortex
Functions of the Cerebellum
maintains equilbrium, helps produce smooth coordinated movements, maints normal postures
The White Outer Columns of the Spinal Tracts are made up of what?
Bundles of myelinated nerve fibers (Dendrites)
Dendrites and cell pbodies of sympathetic preganglionic neurons are located in the
Gray matter of the thoracic and upper lumbar segments of the spinal cord
5 Sympathetic Controls..
Produces goose pimples, increases sweat secreation, constricts blood vessels, relaxes bladder, increases epinephrine secretion
5 Parasympathetic Controls...
Constricts pupils, increases secreation of digestive juices, slows heartbeat, increases peristalis, stimulates lens for near vision
2 Functions of the Autonomic Nervous System are..
Regulate the bodys involuntary functions, Helps restore Homeostasis
How is your Heart Rate Determined?
Combined forces of teh sympathetic and parasympathetic nervous System
Each synaptic know besicle contains a very small quantity of a chemical compound called
The ANS consists of neurons that conduct impulses from the spinal cord or brain stem to the :
Cardiac Muscle Tissue, Smooth Muscle Tissue, Glandular Epithelial Tissue
Part of the brainstem that is a conduction pathway between areas of the brain and body and influences respiration
Sensory relay station from various body areas to the cerebal cortex, also involved with emotions and alterting and arousal mechanisms
Regulates body temperature, water balance, sleep-wake cycles, appetite and sexual arousal
The autonomic nervous system consistes of neurons that conduct impulsess from the brain or spinal cord to the:
cardiac muscle, smooth muscle,and the glandular epithelial
What conduct impulses away from teh brain and spinal cord to muscle and glands:
Motor (Efferent) Neurons
What consists of sensory neurons synapsing in teh spinal cord with interneurons that synapse with motor neurons?
Three neuron Arcs
What are self propagating waves of electrical disturbance that travels along the surface of a neuron membrane?
A nerve impulse is marked by what?
inward movement of postitive sodium ions that leave excess of negative ions outside the stimulated point
What consistes mainly of the posterior pituitary gland, pituitary stalk and gray matter?
The hypothalamus functions by=
acts as major center for controlling the ANS, helps control most internal organs, controls hormone secretions of most endrocrine glands, contains center for controlling body temp, appetite, wakefulness and pleasure
Functions as the center for all spinal cord reflexes sensory tracts conduct impulses to the brain, motor tracts conduct impulses from the brain in the...
What serves as the emergency or stress system controlling visceral effectors during strenuous exercise and strong emotions?
The sympathetic nervous system
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