Cell physiology exam
Terms
undefined, object
copy deck
-
The cells which carry electrical signals are ______
a. axons
b. neurons
c. processes
d. glial cells
e. acinar cells - b. neurons
-
The afferent and efferent axons together form the
a. central nervous system
b. autonomic division system
c. somatic motor division of the nervous system
d. peripheral nervous system
e. visceral nervous system - d. peripheral nervous system
-
Processes or appendages that are part of neurons include
a. axons
b. dendrites
c. neuroglia
d. a and b
e. a, b, and c - d. a and b-- axons and dendrites
-
the thin, branched processes of a neuron whose main function is to receive incoming signals are the
a. cell bodies
b. axons
c. dendrites
d.somata
e. none of these - c. dendrites
-
EPSP's occur when
a. more potassium ions than usual leak out of the cell
b. more calcium ions than usual leak out of the cell
c. chloride ions enter the cell
d. sodium channels are opened
e. hyperpolarizations occur - d. sodium channel are opened
-
Spatial summation refer to__
a. electrical signals reaching neurons from outer space.
b. multiple graded potentials originating from different locations simultaneously
c. repeated graded potentials reaching the trigger zone one after the o - b. multiple graded potentials originating from different locations simultaneously
-
Temporal summation refers to
a. the temporal lobe of the brain coordinating neural interaction
b. multiple graded potentials originating from different locations simultaneously
c. repeated graded potentials reaching the trigger zone one af - c. repeated graded potentials reaching the trigger zone one after the other
-
Which of the following statements are true regarding the action potenial in a given cell:
a. each action potenial is identical to any other action potential
b. an AP does not diminish in stregth as it travel along the cell membrane
c. as l - e. a,b, and c are true
-
The all-or-none phenonomenon applies to
a. action potentials
b. graded potenials
c. both a and b
d. neither a nor b - a. action potentials
-
EPSP's occur when
a. more potassium ions than usual leak out of the cell
b. more calcium ions htan usual leak out of a cell
c. chloride ions enter a cell
d. sodium channels are opened
e. hyperpolariztion occurs - d. sodium channels are opened
-
The absolute refractory period of an AP
a. ensures one-way travel down an axon
b. allows a neuron to ignore a second signal sent that closely follows the first
c. prevents summation of AP
d. a and b
e. both a, b and c - e. both a, b and c
-
In order to signal a stonger stimulus, action potenials become
a. larger
b. more frequent
c. longer lasting
d. both a and b
e. both a and c - b. more frequent
-
Saltatory conduction refers to
a. conduction in frog neurons
b. conduction in squid neurons
c. leapfrogging neurotransmitters
d. action potenials "leaping" from one node of Ranvier to the next
e. movement of NaCl (a sa - d. action potenials "leaping" from one node of Ranvier to the next
-
Saltatory conduction occurs in
a. dendrites
b. unmyelinated axons
c. myelinated axons
d. skeltal muscle cells
e. all of these - c. myelinated axons
-
Which type of synapse dominates the nervous system
a. chemical
b. electrical
c. mechanical
d. processing
e. radiative - a. chemical
-
The ion needed to initiate the release of acetylcholine into the synaptic cleft is
a. sodium
b. potassium
c. calcium
d. chloride
e. zinc - c. calcium
-
Excitatory neurotransmitters of the CNS usually act by opening ____ gates
a. Na
b. K
c. Cl
d. H
e. Ca - a. Na
-
The following steps are involved in transmission at a cholerinergic synapse.
1. chemically regulated ion channels on the postsynaptic membrane are activated
2. calcium ions enter the axon terminal
3. an AP depolarized the axon terminal at - b. 3,2,4,5,1
-
What ion channel is the most important in the generation of the RMP?
a. voltage dependent K channels
b. Passive Na channel
c. passive K channel
d. chemically activated K channel - c. passive K channel
-
what happens to membrane permeability when an aciona potenial is initiated in a nerve cell?
a. the membrane permeability swithes from being highly permeable to K ions to being highly permeable to Na ions
b. the membrane permeability swithes fro - a. the membrane permeability swithes from being highly permeable to K ions to being highly permeable to Na ions
-
What type of sensory receptor is important in iniating the stretch reflex commonly called the nerve jerk reflex?
a. the golgi tendon organ
b. muscle spindles
c. pacinian corpuscles
d. nociceptive receptors - b. muscle spindles
-
What is the neurotransmitter released from the presynaptic motor axon at the neuromuscular juncion?
a. serotonin
b. glutamate
c. acetycholine
d. norepinephrine - c. acetycholine
-
What hapens to the generator potenial in a sensory receptor if you decrease the intensity of the adequate stimulus?
a. it increases in amplitude
b. it stays the same
c. it decreases in amplitude
d. it increases in duration - c. it decreases in amplitude