During the plateau phase of a cardiac muscle cell's action potential, the membrane stays

A. depolarized as potassium enters and calcium exits.
B. hyperpolarized as sodium and calcium exit.
C. hyperpolarized as potassium enters and calcium exits.
D. repolarized as sodium enters and calcium exits.
E. depolarized as potassium exits and calcium enters.


Answer: E

Anatomy & Physiology

You might also like to view...

Vitamin C is a water-soluble vitamin

Indicate whether the statement is true or false

Anatomy & Physiology

What are the three embryonic divisions of the digestive system?

A. Stomach, liver, small intestine B. Foregut, midgut, hindgut C. Coelom, dorsal cavity, ventral cavity D. Stomach, small intestine, large intestine E. Ectoderm, endoderm, mesoderm

Anatomy & Physiology

Which best describes temporal summation?

A. It only refers to addition of EPSPs. B. A synapse is stimulated a second time before the effect of a first stimulus at the synapse has terminated. C. The size of an EPSP depends on the size of the stimulus. D. It always brings a postsynaptic cell to threshold. E. Two synapses on different regions of a cell are stimulated at the same time.

Anatomy & Physiology

Which type of adaptive immunity will result from mother-to-baby IgA transfer via breast feeding?

a) naturally acquired active immunity b) naturally acquired passive immunity c) artificially acquired active immunity d) artificially acquired passive immunity e) None of these choices

Anatomy & Physiology