The [BLANK-1] is the layer of the pericardium responsible for anchoring the heart within the thoracic cavity.

The _____ prevents backflow of blood into the right atrium during ventricular contraction.

___________, is an anticoagulant that inhibits thromboxane A2.

A decrease in oxygen levels in skeletal muscle would initiate an autoregulatory mechanism that would stimulate _________ in the arterioles supplying the muscle.

The cardiac conduction system initiates at the ________, the site of the cardiac pacemaker cells.

An increase in lumen diameter is termed ______ and occurs when smooth muscle ______.

Aldosterone, one of the most potent mineralocorticoids, is released from the ________.

All the following occur during ventricle filling of the cardiac cycle except ________.

If we were able to artificially alter the membrane permeability of the cells of the SA node so that sodium influx is more rapid, ________.

Provide a biological explanation to why AB+ blood type is considered the universal recipient.