Exam 20: Cardiovascular System: the Heart

Small changes in _____________ will have a large impact on the heart's pumping effectiveness,while large changes in ___________ do not impact the effectiveness much.

Fred was admitted to the cardiac unit with chest pains.No arrhythmias and no large changes in the heart rate were observable.Blood samples taken over the next few days showed no increase in enzymes such as creatine phosphokinase.A possible treatment of the condition is

What cardiac arrhythmia will have no QRS complex as a symptom?

The period of time in which the myocardium is insensitive to further stimulation is called the

The epicardium

A serious condition in which a large amount of fluid accumulates in the pericardial cavity and puts pressure of the heart is

Lowered extracellular potassium levels will lower the heart rate because

When comparing cardiac muscle cells and skeletal muscle cells,

Ventricular contraction begins at the

Contraction of the papillary muscles would

Which vessels empty blood into the left atrium?

Which of the following heart chambers is correctly associated with the blood vessel that enters or leaves it?

The "pacemaker" of the heart is the

What action is most responsible for the resting membrane potential in cardiac muscle cells?

Which of the following factors would cause an increase in heart rate?

If the heart receives more sympathetic stimulation than parasympathetic stimulation,the heart will

Which of the following is true?

Calcium-induced calcium release occurs when

From the right ventricle,blood flows directly into the _____.

Which of the following phrases would apply to cardiac muscle cells?