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Chapter 11
Nervous System & Nervous Tissue
| Question | Answer |
|---|---|
| an action potential is just an: | electrical impulse |
| the ___ is always the same regardless of stimulus | impulse |
| the nervous system is ___ | the master controlling & communicating system of the body |
| 3 functions of the nervous system: | sensory input, integration & motor output |
| sensory input | monitor changes in & outside body |
| integration | processes & interprets sensory inpt |
| motor output | activates effector organs |
| the muscles & glands cause a response in the __ __ | motor output |
| cells communicate via ___ | electrical & chemical signals |
| central nervous system (CNS) consists of: | brain & spinal cord |
| what is the integrating & control center system of the nervous system? | CNS |
| the peripheal nervous system (PNS) consists of: | nerves (bundle of axons) |
| the 2 type of nerves found in the PNS are: | spinal & cranial nerves |
| spinal nerves | carry impulses to & from spinal cord |
| cranial nerves | carry impulses to & from brain |
| these peripheal nerves serve as communication lines that link all parts of the body to the ___ | CNS |
| 2 functional subdivisions of the PNS are: | sensory & motor division |
| sensory (afferent) division | carries impulses toward CNS |
| motor (efferent) division | transmits impulses away from CNS |
| the 2 motor divisions are: | somatic & autonomic nervous system |
| somatic nervous system is also known as the __ | voluntary nervous system |
| somatic nervous system | conducts impulses away from CNS to skeletal muscle |
| autonomic nervous system | regulates smooth & cardiac muscles, glands |
| the hypothalamus is in control of this nervous system. | autonomic nervous system |
| this is known as the involuntary nervous system. | autonomic nervous system |
| 2 divisions of the autonomic nervous system? | sympathetic & parasympathetic |
| sympathetic | |
| nervous tissue is made up of 2 principal cells __ and __ | neurons & neuroglia |
| this is known as the resting & digestion system. | parasympathetic |
| neurons | transmit electrical signals |
| neuroglia | surround & wrap neurons |
| neuroglia is also called __ cells | glial |
| axons rely on cell body to renew ___ | proteins & membranes |
| long axons are called: | nerve fibers |
| dendrites collect info with ___ | dendritic spines |
| ___ generate nerve impulses | axons |
| what does the IPSP do? | drives neuron away from threshold |
| what does the EPSP do? | brings neuron closer to the threshold |
| postsynaptic synapse | receives the info - neuron transmits electrical signal away from synapse |
| presynaptic synapse | sends the info - neuron conducting impulses toward synapse |
| ___ neurons are unipolar | sensory |
| ___ neurons are multipolar | motor |
| ___ lies between the sensory & motor neurons | interneurons |
| action potential | electrical impulse that goes down axon |
| graded potential | short-lived, incoming signals operating over short distances |
| ___ is the principal means of long distance neural communication | action potential |
| ___ is the principal way neurons send signals | action potential |
| neurons are classified by 3 processes. what are they? | multipolar, unipolar, and bipolar |
| multipolar | 3 or more porcesses - 1 axon, others dendrites |
| unipolar | 1 short process |
| bipolar | 2 processes - 1 axon, 1 dendrite |
| nonmyelinated fibers conduct impulses ___ slowly | more |
| myelin sheath function: | protects & insulates axon - increases speed of nerve impulse transmission |
| what does the neuron cell body do? | synthesizes proteins, membranes & other chemicals |
| groups of cell body in CNS Are called: | nuceli |
| groups of cell body in PNS are called: | ganglia |
| most abundant and versatile glial cell are: | astrocytes |
| astrocytes cling to ___ | neurons, synaptic endings & capillaries |
| microglial cells | helps when neurons get injured |
| ependumal cells | line central cavities of brain & spinal column - ciliated |
| which glial cell participate in infortmation processing in the brain? | astrocytes |
| satellite cells | surround cell body of neuron |
| schwann cells | surrounds axons of a neuron to form muelin sheaths |
| this glial cell is vital to regeneration of damaged axons. | schwanna cells |
| oligodendrocytes | branched cells that wraps around axons |
Created by:
Mariahj25
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