BIOLOGY 109 EXAM #4 STUDY SET
QUESTIONS AND ANSWERS
Threshold stimuli are those which are strong enough to - ANSWER-cause a net
influx of positively charged Na ions from outside to inside the cell
Which of the following statements concerning the propagation of action potentials is
NOT correct? - ANSWER-action potential propagation is faster for strong stimuli than
for weaker stimuli.
Postsynaptic potentials - ANSWER-directly result from the opening of voltage-gated
ion channels, may be depolarizing or hyperpolarizing, may be summed
An IPSP is - ANSWER-caused by an increase in the permeability of the postsynaptic
membrane to K+ and/or Cl-
The movement of the membrane potential from a value of -70 mV to a value of -80
mV would be termed a(n) - ANSWER-hyperpolarization
The critical event that promotes the fusion of a vesicle with the presynaptic
membrane is - ANSWER-the entry of calcium ions into the axon terminal
The adding together of EPSPs generated by a single presynaptic terminus is an
example of - ANSWER-temporal summation
The cerebral cortex.. - ANSWER-is where basic afferent information is collected and
processed, is the thin outer coat of gray matter found on both the right and left
cerebral hemispheres, receives input from the thalamus, brainstem and other
regions of cortex
The motor (efferent) part of the autonomic nervous system - ANSWER-contains
preganglionic fibers and contains post ganglionic fibers
Which of the following structures or regions is INCORRECTLY paired with its
function - ANSWER-limbic system - motor control of speech
Which of the following glial cells has cilia that, by beating, help to circulate
cerebrospinal fluid through the CNS of vertebrates? - ANSWER-Ependymal cell
The parasympathetic and sympathetic nervous systems make up the ___________
nervous system. - ANSWER-autonomic
Which system controls smooth and cardiac muscles of the digestive, cardiovascular,
and excretory systems? - ANSWER-autonomic nervous system
Which area of the brain is most intimately associated with the unconscious control of
respiration and circulation? - ANSWER-medulla
QUESTIONS AND ANSWERS
Threshold stimuli are those which are strong enough to - ANSWER-cause a net
influx of positively charged Na ions from outside to inside the cell
Which of the following statements concerning the propagation of action potentials is
NOT correct? - ANSWER-action potential propagation is faster for strong stimuli than
for weaker stimuli.
Postsynaptic potentials - ANSWER-directly result from the opening of voltage-gated
ion channels, may be depolarizing or hyperpolarizing, may be summed
An IPSP is - ANSWER-caused by an increase in the permeability of the postsynaptic
membrane to K+ and/or Cl-
The movement of the membrane potential from a value of -70 mV to a value of -80
mV would be termed a(n) - ANSWER-hyperpolarization
The critical event that promotes the fusion of a vesicle with the presynaptic
membrane is - ANSWER-the entry of calcium ions into the axon terminal
The adding together of EPSPs generated by a single presynaptic terminus is an
example of - ANSWER-temporal summation
The cerebral cortex.. - ANSWER-is where basic afferent information is collected and
processed, is the thin outer coat of gray matter found on both the right and left
cerebral hemispheres, receives input from the thalamus, brainstem and other
regions of cortex
The motor (efferent) part of the autonomic nervous system - ANSWER-contains
preganglionic fibers and contains post ganglionic fibers
Which of the following structures or regions is INCORRECTLY paired with its
function - ANSWER-limbic system - motor control of speech
Which of the following glial cells has cilia that, by beating, help to circulate
cerebrospinal fluid through the CNS of vertebrates? - ANSWER-Ependymal cell
The parasympathetic and sympathetic nervous systems make up the ___________
nervous system. - ANSWER-autonomic
Which system controls smooth and cardiac muscles of the digestive, cardiovascular,
and excretory systems? - ANSWER-autonomic nervous system
Which area of the brain is most intimately associated with the unconscious control of
respiration and circulation? - ANSWER-medulla
