Neurotransmitters Synapses Flashcards
The portion of the nervous system that directly controls skeletal muscles is the
somatic motor system
Nerve and muscle cells are classified as excitable tissues because they
Generate electrical signals and propagate electrical signals
The chemical messengers released into synapses are called
Neurotransmitters
During the after-hyperpolarization phase of the action pontential
Potassium channels are closing
Graded potentials
Spread through electronic conduction, can summate, and can be depolarizing or hyperpolarizing
When a cell’s membrane potential becomes less negative or even positive, the cell is said to be
Depolarized
Information arriving at the central nervous system is referred to as
Afferent
The two types of electrical signals transmitted through neurons are
Graded potentials and action potentials
The myelin sheaths that surround axons in the CNS are formed by
Oligodendrocytes
Nervous system cells that are specialized to use action potentials to transmit information are called
Neurons
Interneurons
Are located entirely within the CNS
The membrane potential at which the electrochemical force on an ion=0 is called the
Equilibrium
Action pontential conduction velocity is the slowest in
Small diameter, unmyelinated axons
The total amount of neurotransmitter released at the axon terminal is directly related to the
The total number of action potentials
The term “fast axonal transport” refers to
Vesicular transport of proteins and organelles down the axon
