WSU Biology 251 Exam 1 EXAM, QUESTIONS WITH ACCURATE
ANSWERS | MULTIPLE CHOICES |2025\2026!!
Which of the following statements about homeostasis is FALSE?
a.) Homeostasis is the maintenance of the internal environment
b.) The organ systems work together to maintain homeostasis
c.) Illness can result if homeostasis is disrupted
d.) The primary mechanism to maintain homeostasis is positive feedback
e.) The extracellular fluid is maintained in a state compatible for life - correct answer -d.) The
primary mechanism to maintain homeostasis is positive feedback
What type of cell produces myelin sheaths around axons of neurons in the central nervous
system? - correct answer -oligodendrocyte
In a neuron, where are voltage-gated calcium channels located? - correct answer -axon termnial
The body fluid compartment with a high potassium and protein concentration is _________. -
correct answer -intracellular fluid
In most homeostasis mechanisms, a ________ detects a change in a regulated variable and
sends that information to a(n) _________ which relays signals to a(n) _________. - correct
answer -sensor; integrating; center; effector
The function of a second messenger system is to - correct answer -amplify the response of the
first messenger
, Parasympathetic preganglionic neurons release the neurotransmitter _______; sympathetic
preganglionic neurons release the neurotransmitter ______. - correct answer -acetylcholine;
acetylcholine
The electrochemical gradient for sodium across the membrane is such that the net flux for
sodium movement is directed ________, thereby causing the cell's membrane potential to
become more _______. - correct answer -inward; positive
Which of the following cells would have a greater electrical attraction for sodium ions to enter
the cell?
a.) cell with membrane potential =-70mV
b.) cell with membrane potential = 0mV
c.) cell with membrane potential =-90mV
d.) cell with membrane potential =+20mV
e.) cell with membrane potential =-50mV - correct answer -c.) cell with membrane potential =-
90mV
As the number of receptors on the cell membrane decreases, the response of the target cell will
________. - correct answer -decrease
Which of the following transport mechanisms requires energy? - correct answer -both primary
and secondary active transport
True or False. Synaptic communication to a skeletal muscle cell via a somatic motor neuron can
be excitatory or inhibitory - correct answer -False
Based solely upon its negative electrical charge, the inside of a typical cell will tend to attract
extracellular _____ to move inward - correct answer -cations
ANSWERS | MULTIPLE CHOICES |2025\2026!!
Which of the following statements about homeostasis is FALSE?
a.) Homeostasis is the maintenance of the internal environment
b.) The organ systems work together to maintain homeostasis
c.) Illness can result if homeostasis is disrupted
d.) The primary mechanism to maintain homeostasis is positive feedback
e.) The extracellular fluid is maintained in a state compatible for life - correct answer -d.) The
primary mechanism to maintain homeostasis is positive feedback
What type of cell produces myelin sheaths around axons of neurons in the central nervous
system? - correct answer -oligodendrocyte
In a neuron, where are voltage-gated calcium channels located? - correct answer -axon termnial
The body fluid compartment with a high potassium and protein concentration is _________. -
correct answer -intracellular fluid
In most homeostasis mechanisms, a ________ detects a change in a regulated variable and
sends that information to a(n) _________ which relays signals to a(n) _________. - correct
answer -sensor; integrating; center; effector
The function of a second messenger system is to - correct answer -amplify the response of the
first messenger
, Parasympathetic preganglionic neurons release the neurotransmitter _______; sympathetic
preganglionic neurons release the neurotransmitter ______. - correct answer -acetylcholine;
acetylcholine
The electrochemical gradient for sodium across the membrane is such that the net flux for
sodium movement is directed ________, thereby causing the cell's membrane potential to
become more _______. - correct answer -inward; positive
Which of the following cells would have a greater electrical attraction for sodium ions to enter
the cell?
a.) cell with membrane potential =-70mV
b.) cell with membrane potential = 0mV
c.) cell with membrane potential =-90mV
d.) cell with membrane potential =+20mV
e.) cell with membrane potential =-50mV - correct answer -c.) cell with membrane potential =-
90mV
As the number of receptors on the cell membrane decreases, the response of the target cell will
________. - correct answer -decrease
Which of the following transport mechanisms requires energy? - correct answer -both primary
and secondary active transport
True or False. Synaptic communication to a skeletal muscle cell via a somatic motor neuron can
be excitatory or inhibitory - correct answer -False
Based solely upon its negative electrical charge, the inside of a typical cell will tend to attract
extracellular _____ to move inward - correct answer -cations
