BIO 264 FINAL EXAM 2025 LATEST UPDATED| COMPLETE
QUESTIONS AND ANSWERS | 100% RATED CORRECT | 100%
VERFIED | ALREADY GRADED A+|GET A+
Once excitation-contraction coupling has occurred, calcium ion concentration
increases dramatically in the:
a. sarcoplasmic reticulum
b. cytosol of the muscle fiber
c. sarcolemma
d. terminal cisterna
e. there is no change in calcium concentration - (answer)b. cytosol of the muscle
fiber
As Lisa drove home, she was suddenly alerted to the sound of a blaring horn and
realized she had drifted off to sleep. Which nervous system division dominated
when she was startled awake?
,a. sensory nervous system
b. sympathetic nervous system
c. parasympathetic nervous system
d. somatic nervous system - (answer)b. sympathetic nervous system
Jorge tried to pick up his sofa but discover that it is much heavier than he expected.
What must occur in the muscle to increase tension so he can pick up this heavy
piece of furniture?
a. tetanic spasm
b. recruitment of additional motor units
c. pliometric contraction
d. isotonic eccentric contractions - (answer)b. recruitment of additional motor units
The chemical force for which of the following ions is directed into the cell?
a. potassium only
,b. sodium only
c. calcium only
d. both potassium and sodium
e. both sodium and calcium - (answer)e. both sodium and calcium
Which fiber type helps Frances stand for hours in her job as a nurse?
a. type I fiber
b. typer IIa fiber
c. type IIx fiber
d. Type III fiber - (answer)a. type I fiber
The opening of a chloride channel acts to ________ the development of an action
potential at the axon hillock.
a. stimulate
, b. inhibit
c. facilitate
d. further
e. enhance - (answer)b. inhibit
If a resting axon increases its permeability to potassium ions: - (answer)the eflux of
K+ will lead to membrane to hyperpolarization.
Which number of the graph represents when voltage-gated sodium channels are
open? - (answer)2
What effect does a B2 agonist have on the diameter of respiratory passages? -
(answer)The diameter of the respiratory passageways will increase.
The all-or-none principle, associated with the action potential, states that
_____________. - (answer)once membrane potential reaches threshold, an action
QUESTIONS AND ANSWERS | 100% RATED CORRECT | 100%
VERFIED | ALREADY GRADED A+|GET A+
Once excitation-contraction coupling has occurred, calcium ion concentration
increases dramatically in the:
a. sarcoplasmic reticulum
b. cytosol of the muscle fiber
c. sarcolemma
d. terminal cisterna
e. there is no change in calcium concentration - (answer)b. cytosol of the muscle
fiber
As Lisa drove home, she was suddenly alerted to the sound of a blaring horn and
realized she had drifted off to sleep. Which nervous system division dominated
when she was startled awake?
,a. sensory nervous system
b. sympathetic nervous system
c. parasympathetic nervous system
d. somatic nervous system - (answer)b. sympathetic nervous system
Jorge tried to pick up his sofa but discover that it is much heavier than he expected.
What must occur in the muscle to increase tension so he can pick up this heavy
piece of furniture?
a. tetanic spasm
b. recruitment of additional motor units
c. pliometric contraction
d. isotonic eccentric contractions - (answer)b. recruitment of additional motor units
The chemical force for which of the following ions is directed into the cell?
a. potassium only
,b. sodium only
c. calcium only
d. both potassium and sodium
e. both sodium and calcium - (answer)e. both sodium and calcium
Which fiber type helps Frances stand for hours in her job as a nurse?
a. type I fiber
b. typer IIa fiber
c. type IIx fiber
d. Type III fiber - (answer)a. type I fiber
The opening of a chloride channel acts to ________ the development of an action
potential at the axon hillock.
a. stimulate
, b. inhibit
c. facilitate
d. further
e. enhance - (answer)b. inhibit
If a resting axon increases its permeability to potassium ions: - (answer)the eflux of
K+ will lead to membrane to hyperpolarization.
Which number of the graph represents when voltage-gated sodium channels are
open? - (answer)2
What effect does a B2 agonist have on the diameter of respiratory passages? -
(answer)The diameter of the respiratory passageways will increase.
The all-or-none principle, associated with the action potential, states that
_____________. - (answer)once membrane potential reaches threshold, an action
