the cytoplasmic extensions that together with the cell body, provide the main receptive surfaces for neurons is?
when a nerve fiber is polarized the concentration of ________ ion is higher on the outside and the concentration of ______ ion is higher on the inside
saltatory conduction in myelinated neuron is _______
(faster/slower) in terms of conduction compared to the unmyelinated neuron.
when an action potential passes over the surface of a synaptic knob, the contents of the vesicles are released in response to the presence of _____ ions
if a neuron receives a series of stimuli whose effect is excitatory but subthreshold, the meuron is more excitable to incoming stimulation than before and is said to be?
an infants responses to stimuli are coarse and undifferentiated because its nerve fibers are not yet _____?
neurons are _______, whereas neurogical cells are ________
nerve cells; structural and functional units of the nervous system
Myelin is defined as ______
fatty material that forms a sheath like covering around certain nerve fibers
a myelinated nerve fiber is characterized by being ______, whereas an unmyelinated nerve fiber is characterized by being _______
white, and composing the white matter of the brain and spinal cord; gray and composing the gray matter of the brain an spinal cord
action potentials are related to nerve impulses because propagation of action potential along the fiber constitutes a ______ impulse
if the body had a low calcium level then this could affect the release of neurotransmitters by causing a _______ in the amount released from the synaptic knob.
the process of transmitting a nerve impulse from one neuron to another involves a
nerve impulse stimulating presynaptic axons to release a neurotransmitter into a synaptic cleft
the cells within the nervous system that fill spaces and give support to neurons are called _____ ______
the difference in electrical charge between the inside and outside of a polarized nerve cell membrane is called the _____ ______
a nerve impulse consists of a wave of ____ ______ moving away from a point of stimulation
body parts such as muscles and glands that are capable of responding to nerve impulses are called ______