which of the choices below describes the ANS?
motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands
what are ciliated CNS neuroglia that play an active rold in moving the cerebrospinal fluid called?
what does the central nervous system use to determine the strength of a stimulus?
frequency of action potentials
which of the following is and excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
Which of the following describes the nervous system intergrative function?
analyses sensory information, stores information, makes decisions
the period after an intial stimulus when a neuron is not sensitive to another sitmulus is the__________.
absolute refractory period
which ion channel opens in respnse to a change in membrane potential and participates in the generation and conduction of action potentials?
what is the role of acetylcholinesterase?
destroy ACh a brief period after its release by the axon endings
which of the following is not a function of the autonomic nervous system?
innervation of skeletal muscle
the substance released at axon terminals to propagate a nervous impulse is called a(n)_____.
a neuron that has as its primary function the job of connecting other neurons is called a(n)______.
what is the correct statement regarding synapses?
neurotransmitter receptors are located on the axon terminals of cells
when a sensory neuron is excited by some form of energy, the resulting graded potential is called a(n)_______.
which of the following is not true of graded potentials?
they increase amplitude as they move away from the stimulus point.
which of the following is true about the movement of ions across excitable living membranes?
sodium gates in the membrane can open in response to electrical potential changes.
a second nerve impulser cannot be generated until_____.
the membrane potential has been re-established
in what way do the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment
the interior is negatively charged and contains less sodium
If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon ________.
the impulse would spread bidirectionally
Which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone?
Which of the following describes the excitatory postsynaptic potential?
short distance depolarization
During membrane repolarization, there is a decrease in the membrane permeability to which ion?
The space between the presynaptic and postsynaptic membranes is called the __________.
Generation of an action potential can be inhibited by all of the following except: ___________.
All of the following are true of action potentials except: ______________.
they travel more slowly on myelinated
Neurotransmitters are removed from the synaptic cleft by all of the following except: ___________.