passive conduction of electrical current down an axon
when cells engulf and digest other cells or debris due to degeneration.
what do calcium channels do and where are they?
they are in the terminal button (the get there through diffusion and E.F's)
five steps of the release of a neurotransmitter
1. action potential gets to terminal 2.calcium channel opens 3. Ca2+ enters terminal via Diff and E.F's 4.Vesicles fuse with terminal membrane 5.Neurotransmitter inside vesicle is released into synaptic cleft
after neurotransmitter is released, what happens to it?
-gets picked up by astrocytes -glia cells perform re uptake -enzymes break neurotransmitter down
what are the three types of synapses
1. Axoaxonic 2.Axosomatic 3.Axodendritic
terminal button>>>>terminal button of another neuron
naturally secreted substance, acts like a neurotransmitter, travel farther and disperse more widely, as they are not restricted to the synapse. most are peptides
chain of aminoacids linked together by peptide bonds (chemical attachments)
secreted by endocrine glands. affects target cells.
stimulate metabotropic receptors in a target cell
lipid soluble, formed from cholesterol, initiates changes in the cells physiological process.
cell directly affected by a hormone of other chemical signal.
assist mRNA in protein manufacturing
facilitate chemical reactions
DNA and Chromosomes contain?
its breakdown fuels cell activity by providing energy, it is a key part of cellular metabolism
finishes protein processing
receptors that respond to a neurons own neurotransmitter.
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