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BIO 235 FINAL EXAM QUESTIONS AND ANSWERS 2024
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BIO 235 FINAL EXAM QUESTIONS AND ANSWERS 2024
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BIO 235 FINAL EXAMwhich of the following does not contribute to the fact that the membrane
potential is negative
a)leaky potassium channels
b)lots o intracellular proteins that are negatively charged
c) lots of extracellular proteins that are positivily charged
d) Na+/K+ ATPase - ANSWERS-c) lots of extracellular proteins that are positivily
charged
organ system that protects the body against injury and dehydration and is also
important in the regulation of temperature
a)urinary system
b)digestive system
c)integumentary system
d) reproductive system
e) nervous system - ANSWERS-c)integumentary system
tissues are made up of ___ and intracellular matrix
a)molecules
b)organs
,c)atoms
d)cells - ANSWERS-d)cells
____is the smallest body fluid compartment
a)extra cellular fluid
b)intracellular fluid
c)plasma - ANSWERS-c)plasma
___ is when action potentials jump from one node of Ranvier to the net
a) spike phase
b)myelin-mediated conduction
c)saltatory conduction
d)repolarization - ANSWERS-c)saltatory conduction
charybdotoxin (CTX) is a scorpion toxin that paralyzes its victim by preventing
neurons from returning to -70mV after an action potential begins. which of the
following channels is likely inhibited by this toxin?
a) voltage-gated Cl- channels
b) voltage-gated K+ channels
c) voltage-gated Ca2+ channels
d) voltage-gated Na+ channels - ANSWERS-b) voltage-gated K+ channels
,when potassium ion flow out of a cell which of the following will occur?
a)no change
b)depolarization
c)hyper polarization
d)none of the above - ANSWERS-c)hyper polarization
spinal synaptic reflexes decrease response time to a painful stimulus by
decreasing ___.
a) saltatory conductin
b)synaptic delay
c)threshold potentials
d) none of the above - ANSWERS-d) none of the above
which of the following regions of the neuron contains the most neurotransmitter
receptors and most often receives information from other neurons?
a) dendrites
b)axon terminals
c)axons
d)axon hillcock - ANSWERS-a) dendrites
which of the following regions of the brain controls coordination of muscle
movement?
a)cerebral cortex
, b)cerebellum
c)brain stem nuclei - ANSWERS-b)cerebellum
____is constant maintenance o physiological variable (temp, pH, etc) within a
narrow range despite changing external conditions
a) homeostasis
b)positive feedback
c)hemostasis
d)hetero-stasis - ANSWERS-a) homeostasis
which of the following would consist mostly of myelinated axons carrying
messages between regions of the brain and spinal chord?
a)white matter
b)afferent nerves
c)efferent nerves
d)gray matter - ANSWERS-a)white matter
in a chemical synapse neurotransmitter must cross a space called the ___and bind
to receptors on a ___neuron
a) synaptic cleft/pre-synaptic
b)gap junction/ pre-synaptic
c)gap junction/post-synaptic
d)synaptic cleft/ post-synaptic - ANSWERS-d)synaptic cleft/ post-synaptic
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