Fill in the blank with the best possible answer.

1		The vessels that return blood to the heart are called .
2		The thin-walled chambers that can stretch are the .
3		The connective tissue framework within the heart is called the .
4		The amount of blood in the ventricle during isovolumetric relaxation is called the .
5		The amount of blood in a ventricle just prior to contraction is the .
6		The amount of stretch in the walls of the heart before contraction is called the .
7		Based on Frank Starlings law of the heart, hypertension causes an increase in .
8		Thick walled blood vessels, with abundant smooth muscle, are called .
9		The most important vessels in the regulation of blood pressure are the .
10		The smallest, thinnest blood vessels are called .
11		The most important measure of blood pressure is actually the diastolic pressure plus one-third the pulse pressure. This is called the .
12		The pacemaker of the heart is the node.
13		Blood gases are monitored by the .
14		A change in the diameter of a blood vessel changes the , and may change the blood pressure.
15		BP = CO x