Oxygen is added to blood as it flows through the ________ circuit.

Which of the following are involved in the pulmonary circuit?

Which one of the following blood vessels carries oxygenated blood:

If the pacemaker cells in the SA note become more permeable to potassium ions, the

The pulmonary arteries carry blood to the

In response to hemorrhage, there is

An increased firing of the parasympathetic nervous system causes increased cardiac output.

Generalized vasoconstriction occurs as a result of:

The _____ _____ normally establish the rate of contraction

The mitral valve is normally closed: