Physio Ex Exercise 6 Activity 5|UB
General Physiology BIO 303 Question
and answers verified to pass 2025
Which organelle in the cardiac muscle cell stores calcium? - correct answer
Sarcoplasmic reticulum
Verapamil is a calcium-channel blocker. Its effects could be described as -
correct answer Negative chronotropic and negative inotropic
Decreases the heart rate and the force of contraction of the heart.
*When the cardiac muscle cell is at rest, most of the potassium is found
where? - correct answer In the cytosol
Resting cardiac muscle cells are most permeable to - correct answer
Potassium
Because calcium-channel blockers are negative chronotropic and negative
inotropic, what effect do you think increasing the concentration of calcium will
have on heart rate? - correct answer Positive chronotropic, positive inotropic
Increased calcium allows the heart to increase its rate of depolarization and
increase the force of contraction which increases the heart rate.
Where in the cardiac muscle cell is most of the sodium normally found? -
correct answer Outside of the cell
General Physiology BIO 303 Question
and answers verified to pass 2025
Which organelle in the cardiac muscle cell stores calcium? - correct answer
Sarcoplasmic reticulum
Verapamil is a calcium-channel blocker. Its effects could be described as -
correct answer Negative chronotropic and negative inotropic
Decreases the heart rate and the force of contraction of the heart.
*When the cardiac muscle cell is at rest, most of the potassium is found
where? - correct answer In the cytosol
Resting cardiac muscle cells are most permeable to - correct answer
Potassium
Because calcium-channel blockers are negative chronotropic and negative
inotropic, what effect do you think increasing the concentration of calcium will
have on heart rate? - correct answer Positive chronotropic, positive inotropic
Increased calcium allows the heart to increase its rate of depolarization and
increase the force of contraction which increases the heart rate.
Where in the cardiac muscle cell is most of the sodium normally found? -
correct answer Outside of the cell
