Cardiac physiology: Blood moves from the heart into the aorta as oxygenated blood under the force of the systolic contraction. Arterial blood passes through the nonpulsatile microcirculation passively based on the tone of the afferent and efferent arterioles and venules. Once back in the venous microcirculation the veins coalesce and form veins taking blood to the heart by internal valves and compression by muscles.
Answered 6/18/2015
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Cardiac tamponade: Is fluid or blood between the heart & its surrounding sac, the pericardium. A needle may be introduced into the space to remove fluid, or a window may be made in the pericardium. Fluids &/or pressor agents may be given to maintain BP until fluid removed. Oxygen is given to reduce the heart's workload. Tests are performed to determine the cause. See comment for source of more info—>.
Answered 6/10/2014
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