Term
| Nervous Tissue is composed of? (2) |
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Definition
| Nerve Cells (AKA neurons) and Neurogila |
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Term
| Neurons react to their ______? |
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Definition
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Definition
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Term
| Axons ______ information away form the cell? |
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Definition
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Term
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Definition
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Term
| Information is carried from neuron to neuron across the ______? |
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Definition
| Synapse (Space between neurons) by neurotransmitters |
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Term
| Central nervous system consists of? (2) |
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Definition
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Term
| Peripheral nervous system is composed of? (3) |
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Definition
| Cranial, Spinal, and Nerve |
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Term
| Three functions of Nervous System? |
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Definition
| Sensory, Integrative, motor |
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Term
| Peripheral nervous system has _____ and _____ branches? |
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Definition
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Term
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Definition
| Sensing and conscious activities |
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Term
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Definition
| Controls unconscious activities |
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Term
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Definition
| granular cytoplasm, organelles, and microtubules |
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Term
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Definition
| support fibers in the cell body |
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Term
| Chromatophilic substance is in? |
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Definition
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Term
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Definition
| branched receptive structures |
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Term
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Definition
| have braches, collaterals |
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Term
| Axons end in the ______ _____ at the terminal? |
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Definition
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Term
| Axons are separated from another receptive surface by the? |
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Definition
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Term
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Definition
| Neuroglial cells that produce the myelin sheath, a lipid-rich covering of the axon |
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Term
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Definition
| surrounds the myelin sheath and contains the nucleus of the schwann cells |
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Term
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Definition
| gaps in the myelin sheath |
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Term
| Fibers WITH myelin sheaths? |
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Definition
| myelinated nerve fibers (white matter) |
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Term
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Definition
| unmyelinated nerve fibers (gray matter) |
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Term
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Definition
| Based on stuctural differences |
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Term
| Sends nerve impulse in _____ direction? |
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Definition
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Term
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Definition
| Two process from the cell body (Dendrite & axon) |
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Term
| Dendrite and Axon are found is what sense organs?(3) |
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Definition
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Term
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Definition
| one process from the cell body that functions as an axon |
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Term
| Unipolar neurons are found in? |
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Definition
| clusters (gentian) outside the brain and spinal cord |
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Term
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Definition
| man processes extend from the cell body, one axon and many dendrites |
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Term
| Multipolar Neurons are found? |
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Definition
| in the brain and spinal cord |
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Term
| Sensory (afferent) neurons? |
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Definition
| carry impulses from the body to brain or spinal cord |
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Term
| Intereurons (association neurons)? |
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Definition
| lie within brain and spinal cord, they form links with other neurons |
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Term
| Motor (efferent) neurons? |
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Definition
| Carry nerve impulses out of the brain or spinal cord to effectors, muscles or glands |
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Term
| Neuroglia are ____ cells? |
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Definition
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Term
| Peripheral nervous system? |
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Definition
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Term
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Definition
| star-shaped cells regulate environment around neurons and aid in healing brain injury |
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Term
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Definition
| Form myelin in the brain and spinal cord |
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Term
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Definition
| support neurons and phagocytize bacteria and cell debris |
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Term
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Definition
| regulate the composition of cerebrospinal fluid |
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Term
| Mature neurons do NOT _____ so neurons are not replaced in response to injury? |
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Definition
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Term
| Damaged axons in _________ nervous system may regenerate? |
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Definition
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Term
| Schwann cells regenerate the _______ sheath? |
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Definition
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Term
| The cell membrane is _______? |
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Definition
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Term
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Definition
| the inside is negatively charged with respect to the outside |
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Term
| Polarization is due to _________ distillation ? |
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Definition
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Term
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Definition
| the major intracellular cation |
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Term
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Definition
| The major extracellular cation |
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Term
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Definition
| is one that is not being stimulated to send a nerve impulse (has resting potential) |
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Term
| The nerve impulse is the ______ ______? |
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Definition
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Term
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Definition
| membrane potential becomes more negative than resting (Action potential less likely to occur? |
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Term
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Definition
| the membrane potential becomes less negative (possibly triggers an action potential) |
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Term
| Local potentials are ______? |
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Definition
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Term
| the amount of change in potential is proportional to the _______ of the stimulation? |
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Definition
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Term
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Definition
| level of stimulation is great enough to generate an action potential |
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Term
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Definition
| add stimuli to reach threshold |
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Term
| Voltage-gated _____ channels open in trigger zone? |
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Definition
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Term
| Na+ diffuses _____, depolarizing the membrane? |
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Definition
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Term
| Volatage-gated K+ channels oped, K+ diffuses ______? |
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Definition
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Term
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Definition
| short time following a nerve impulse that a threshold stimulus will not trigger another impulse |
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Term
| If a nerve fiber responds, it responds _______? |
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Definition
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Term
| Unmyelinated fibers conducts an impulse over its _______ system? |
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Definition
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Term
| Myelinated fibers involve action potentials occurring at the ____ __ _____? |
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Definition
| nodes of ranvier, This is saltatory conduction, this speeds conduction |
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Term
| ______ fivers conduct faster? |
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Definition
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Term
| Nervous system produces at least ____ different neurotransmitters? |
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Definition
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Term
| list examples of neurotransmitters? (4) |
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Definition
| acetylocholine, monoamines, amino acids, peptides |
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Term
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Definition
| groups of neurons that work together |
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Term
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Definition
| a single neuron receives impulses from two or more fibers that originate from different parts of neurons system, allow collection and processing information |
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Term
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Definition
| an impulse from one neuron stimulates two or more fibers, this may amplify a response, due to axon branching |
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