In in the initial segment, an action potential is generated if the membrane potential reaches the - ✔✔ threshold value
Neurons integrate multiple
... [Show More] synaptic inputs by the process of - ✔✔ propagation
if several EPSPs occur at a synapse over a short period of time, they undergo ______ at the initial segment - ✔✔ temporal summation
The all or none law refers to the fact that action potentials will only occur if the initial segment reaches - ✔✔ threshold
The conductive segment of a neuron is the - ✔✔ total length of the axon
A positive change in the membrane potential is called - ✔✔ depolarization
____ is the return of polarity from positive back to negative (RMP) - ✔✔ repolarization
during ______ ______ an axon is either incapable of generating an action potential or requires a larger than normal stimulus - ✔✔ refractory period
A change in membrane potential insufficient to cause an action potential is known as a - ✔✔ subthreshold value
The process by which postsynaptic potentials are added together at the initial segment is known as - ✔✔ summation
The main activity of the ___ is propagation of an action potential along the axolemma - ✔✔ conductive segment
The functions of astrocytes are to - ✔✔ help form the BBB
assist neuronal development
regulate the composition of interstitial fluid
Which segments of a neuron contain large numbers of voltage-gated potassium channels and voltage-gated sodium channels? - ✔✔ the initial segment
the conductive segment
During an actin potential, voltage gated potassium channels open after voltage-gated sodium channels. The effect this has on the membrane potential is - ✔✔ it becomes less positive and more negative
Neuron cell bodies in the PNS are found clustered in - ✔✔ ganglia
Nervous tissue is composed of - ✔✔ glial cells and neurons
____ are large cells that ensheath many different axons - ✔✔ oligodendrocytes
The myelin sheath is made of a high percentage of - ✔✔ lipids
The electrical gradient in a resting neuron is such that the ___ of the cell is negative relative to the ____ - ✔✔ inside of the cell is negative relative to the outside
Which terms are used for the structural classification of nerves? - ✔✔ cranial and spinal
The components of the somatic sensory division are
stretch or organ walls
taste
joints and muscles
hearing - ✔✔ taste
joints and muscles
hearing
____ are considered "nerve glue" - ✔✔ neuroglial cells
A fascicle is surrounded by a layer of dense irregular CT called - ✔✔ perineurium
The plasma membrane of an axon is called - ✔✔ axolemma
Which ions have leak channels on a neuron plasma membrane? - ✔✔ Na+
K+
_____ are unique channels in that they have three states; resting, activation and inactivation - ✔✔ voltage gated channels
If you were moving across a neuron's membrane from the receptive segment toward the transmissive segment, in the ___ is where you would first encounter large numbers of voltage gated Na+ and K+ channels - ✔✔ initial segment
What are the two divisions of the sensory nervous system? - ✔✔ visceral division and somatic division
_____ occurs when the inside of a cell becomes more negative that the RMP - ✔✔ hyperpolarization
The net diffusion of a given ion is dependent upon its - ✔✔ electrochemical gradient
Sensory nerves carry information where - ✔✔ to the CNS
Neurons are classified ___ depending on the direction the nerve impulse travels - ✔✔ functionally
Neurolemmocytes create the myelin sheath in the ____ NS - ✔✔ PNS
Voltage is a measure of relative - ✔✔ potential energy [Show Less]