Quiz 1 Flashcards
Does the inside become more or less negative during depolarization?
Less negative
What ion is used during depolarization and what direction does it move across the plasma membrane?
The ion is sodium and it moves from outside of the cell to inside the cell across an ion sodium channel.
Where do action potentials take place along a myelinated neuron?
muscle cells and axons of neurons
What kind of gated channels are used during an action potential?
voltage-gated sodium and potassium channels
What are the steps that occur in/at the axon terminal once the action potential has reached the axon terminal?
channels are closed
Na channels open
na channels reclose
wheres the presynaptic membrane
axon
where is post synaptic membrane
dendrite
What direction do sensory/afferent neurons or sensory/afferent divisions travel in?
Transmit impulses from sensory receptors toward CNS
direction the motor neuron travel within the body?
Carry impulses from CNS to effectors
What does the somatic nervous system innervate?
convey impulses to skeletal muscle
What are the functions of the microglia
defnesive cells in the CNS
What are the functions of the ependyma
cells in CSF filled cavities
What are the functions of the Schwann
Surround all peripheral nerve fibers and form myelin sheaths in thicker nerve fibers
What are the functions of the oligodendrocytes
Processes wrap CNS nerve fibers, forming insulating myelin sheaths in thicker nerve fibers
What happens when acetylcholine attaches to the postsynaptic membrane or cell?
it opens ion channels
