What organ contains the cardio-accelerator and cardio-inhibitory neurons that assist in the regulation of heart rate? 

What is the most important force in venous flow?

When the left ventricle contracts, the ________________ valve closes and the _______________ valve is pushed open.

When sodium channels are fully open, the membrane of the ventricular cardiomyocyte ________________________.

Laminar flow is the normal condition for blood flow throughout most of the circulatory system. It is characterized by concentric layers of blood moving in parallel down the length of a blood vessel.  Which of the following factors has the greatest affect on laminar flow?

The opening and closing of heart valves is caused by _______________________.

Which of the following would decrease the velocity of blood flow?

A person with a systolic blood pressure of 130 mm Hg and a diastolic pressure of 85 mm Hg would have a mean arterial pressure of about MAP = DP + PP/3

The ____________________ provides most of the calcium ions needed for myocardial contraction.

Which of the following is NOT considered a leukocyte?