Question

Select all of the CORRECT statements associated with heart physiology. There may be more than one answer. (2 pts)

Select one or more:

a. About ninety-nine percent of the cardiac cells are autorhythmic cells while one percent are contractile
          cells.

b. High levels of norepinephrine or epinephrine in the atria and the ventricles will increase heart rate and stroke volume.

c. Muscarinic receptors are in the atria and the ventricles.

d. Norepinephrine is secreted by both sympathetic pre-ganglionic and post-ganglionic nerves.

e. Beta 1 receptors are located in the atria and the ventricles.

f. Both right and left ventricles eject the same amount of blood per minute, known as stroke volume.

g. Bundle of His receives the electrical signal directly from the contractile cells in the atria.

h. Purkinje fibers and Sino-atrial Node are autorhythmic cells.

i. The sympathetic pre-ganglionic neuron will trigger the adrenal medulla to secrete 80% epinephrine, 20% norepinephrine, and less than 1% dopamine.

Answer 1

The correct statements are

B)High levels of norepinephrine or epinephrine in the atria and the ventricles will increase the heart rate and stroke volume.

C) Muscuranic receptors are in atria and the ventricles.

D) Norepinephrine is secreted by both sympathetic pre-ganglionic and post-ganglionic nerves.

E)Beta 1 Receptors are located in the atria and the ventricles .

H) Purkinje fibers and sino-atrial node are autorhytamic cells.

I)The symapthetic pre -ganglionic neuron will trigger the Adrenal medulla to secrete 80% epinephrine ,20% norepinephrine and less than 1% dopamine.