Functions in neurotransmitter production
-No centrioles=no mitosis
Communicates using chemical messengers(hormones) secreted into to the blood
Motor division(autonomic nervous system): carries signals to glands, cardiac & smooth muscle
Motor division: carries signals to skeletal muscles
(Neurosoma or cell body): the control center of neuron
-single nucleus with large nucleolus
________ Neuron: one axon & multiple dendrites
-Most common-most neurons in CNS
(association neurons): Entirely within CNS
-connect motor & sensory pathways
-About 90% of all neurons
-Receive signals from many neurons & carry out intergrative functions (make decisions on response)
(irritability) Respond to chemical & electrical stimuli
Plasma membrane of axon
Sense organs receive informartion then transmit coded messages to the CNS
-CNS process information based on past experience then determines response
-CNS issues commands to muscles & gland cells to carry out such a respnse
Cytoplasm of axon
Afferent division: carries signals from receptors in the body to CNS
______________Arborization: Axon branches extensively on distal end
Branches that come off the soma
-Primary site for receiving signals from other neurons
-The more ________ the neuron has, the more information it can receive
-Provide precise pathways for the reception and processing of information
A knot-like swelling in a nerve where neuron cell bodies are concentrated
Down
Uses electrical & chemical means to send messages from cell to cell
(chromatophilic substance): dark granules of rough ER
Only _____ axon per neuron(some neurons have none)
___________ Neuron: one axon & one dendrite
-Olfactory cells, retina, inner ear
Sensory division- carries signals from receptors in the skin, muscles, bones, joints
Efferent division: carries signals from CNS to effectors in the body
____________ neuron: single process leading away from soma
-Sensory cells from skin & organs to spinal
Produce & transmit electrical signals that are quickly conducted to other cells at distant locations
_____________ neuron: many dendrites but no axon
-Retina, brain, adrenal gland
Nervous system- Brain & Spinal cord
Synaptic knob secretes a neurotransmitter that influences the next cell
Endocrine and nervous systems maintain ___________ coordination
May enclose axon
Nervous system- The rest of the nervous system
-Composed of nerves & ganglia
Sensory division- carries signals from the viscera(heart, lungs, stomach, and urinary bladder)
(nerve fiber) originates from a mound on the soma called the ______ hillock
Specialized for rapid conduction of signals to distant points
A bundle of axons wrapped in fibrous connective tissue
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