Exam 2 practice questions for ch 7
Sensory neurons ________. are multipolar, and carry impulses away from the CNS are bipolar, and carry impulses away from the CNS are multipolar, and carry impulses toward the CNS are pseudounipolar, and carry impulses toward the CNS
are pseudounipolar, and carry impulses toward the CNS
The release of ACh at parasympathetic effectors is always stimulatory. True or false
false
A recently depolarized area of a cell membrane cannot generate an action potential because of the ______________. Multiple Choice absolute refractory period high concentration of sodium ions in the extracellular fluid presence of receptor sites on the membrane high concentration of potassium ions in the cytoplasm
absolute refractory period
Which of the following is/are a location of nicotinic ACh receptors? Autonomic ganglia All of the choices are correct. Specific regions of the brain Skeletal muscle
All of the choices are correct.
Which type of neuroglia supports the metabolic needs of the blood-brain barrier? Oligodendrocytes Ependymal cells Astrocytes Microglia Schwann cells
Astrocytes
What structure(s) are present exclusively within the myelin sheath of the PNS? Neurilemma Nodes of Ranvier Sheath of Schwann Both neurilemma and sheath of Schwann are correct.
Both neurilemma and sheath of Schwann are correct.
At what region of the neuron are action potentials first produced? Multiple Choice Cell body Axon hillock Initial segment of an axon Dendrites
Initial segment of an axon
What type of cells produce the myelin sheath in the central nervous system (CNS)? Multiple Choice Schwann cells OligodendrocytesCorrect Astrocytes Microglia
Oligodendrocytes
The myelin sheaths of PNS neurons are produced by ________. Multiple Choice ependymal cells Schwann cells leukocytes oligodendrocytes
Schwann cells
The term "white matter" refers to ________. Multiple Choice nonmyelinated cell bodies and dendrites in the CNS myelinated axons in the PNS nonmyelinated axons in the CNS myelinated axons in the CNS
myelinated axons in the CNS
Chemicals that stimulate action potentials in postsynaptic cells are called ________. Multiple Choice neurotrophins hormones neurotransmitters enzymes
neurotransmitters
The gap of exposed axon in the myelin sheath is the ________. Multiple Choice node of Ranvier sheath of Schwann neurilemma white matter
node of Ranvier
Spatial summation ________. occurs when a single neuron releases neurotransmitter rapidly only involves excitatory postsynaptic potentials occurs because of the convergence of many neurons on a single postsynaptic cell only involves inhibitory postsynaptic potentials
occurs because of the convergence of many neurons on a single postsynaptic cell
Temporal summation ________. occurs when a single neuron releases neurotransmitter rapidly occurs because of the convergence of many neurons on a single postsynaptic cell only involves inhibitory postsynaptic potentials only involves excitatory postsynaptic potentials
occurs when a single neuron releases neurotransmitter rapidly
Ion channels that open in response to depolarization are called ________. Multiple Choice ion-gated channels voltage-gated channels potential-gated channels stimulation-gated channels
voltage-gated channels
The average resting membrane potential of an axon is ________. Multiple Choice +30mV −85mV 0 mV −70mV
−70mV