Chapter 7 Study Questions (Part 1) Flashcards
define afferent neurons
PNS –> CNS
define efferent neurons
CNS –> PNS
define interneurons
connect spinal motor and sensory neurons
what is soma / cell body ?
region of the neuron that contains the nucleus and most organelles
what are dendrites ?
where a neuron receives input from other cells
what are dendritic spines?
tiny protrusions from dendrites, which form functional contacts with neighboring axons of other neurons
what is the axon hillock?
where the axon originates and action potentials are originated
what is the axon?
transmits electrical impulses called action potential
what is the axon terminal?
releases neurotransmitters on to the downstream target cell
what is the synapse?
area where a neuron makes contact with another cell
what is the synaptic cleft?
small gap that separates the presynaptic membrane and postsynaptic membrane
where are leak channels located on a neuron?
why?
found over the entire cell.
to maintain resting Vm
where are Na+/K? ATPase pumps located on a neuron? why?
found all over the cell.
to maintain resting Vm
where are ligand-gated ion channels located on a neuron?
dendrites and the cell body
where are voltage-gated Na+, K+, and Ca+2 channels located on a neuron?
found from the axon hillock to the axon terminal
