Which layer of the heart wall is composed primarily of cardiac muscle?

If your ESV = 20 mL and EDV = 90 mL, how much blood is pushed into the systemic circuit each time your left ventricle contracts?

If blood pressure has decreased, the blood vessel can vasoconstrict to increase it once again.

Ventricular repolarization on an ECG is represented by the:

Hormones, clotting factors, and electrolytes are carried within which component of the blood?

The degree of stretch of the ventricular muscle fibers at the end of diastole is known as: 

If the bicuspid valve is stenotic, this will directly increase the workload of the _________________________.

Which part of the ICS has the fastest intrinsic rate?

If a patient is severely dehydrated, their hematocrit would likely be: 

Briefly describe what causes the plateau phase during cardiac muscle action potentials.  Then describe why this plateau phase is important to the function of the heart.