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vocab ch. 35 sec. 1 and 2
biology
17
Biology
10th Grade
03/30/2011

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Term
action potential
Definition
reversal of charges across the cell membrane of a neuron; also called a nerve impulse
Term
axon
Definition
long fiber that carries impulses away from the cell body of a neuron
Term
cell body
Definition
largest part of a typical neuron; contains the nucleus and much of the cytoplasm
Term
connective tissue
Definition
tissue that holds organs in place and binds different parts of the body together
Term
dendrite
Definition
extension of the cell body of a neuron that carries impulses from the environment or from other neurons toward the cell body
Term
epithelial tissue
Definition
tissue that covers the surface of the body and lines internal organs
Term
feedback inhibition
Definition
process in which the product or result stops or limits the process
Term
homeostasis
Definition
process by which organisms maintain a relatively stable internal environment
Term
muscle tissue
Definition
tissue that controls the internal movement of materials in the body, as well as external movement
Term
myelin sheath
Definition
insulating membrane surrounding the axon in some neurons
Term
nervous tissue
Definition
tissue that receives messages from the body's external and internal environment, analyzes the data, and directs the response
Term
neuron
Definition
cell that carries messages throughout the nervous system
Term
neurotransmitter
Definition
chemical used by a neuron to transmit an impulse across a synapse to another cell
Term
resting potential
Definition
electrical charge across the cell membrane of a resting neuron
Term
specialized cell
Definition
cell that is uniquely suited to performing a particular function
Term
synapse
Definition
location at which a neuron can transfer an impulse to another cell
Term
threshold
Definition
minimum level of a stimulus required to activate a neuron
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