6. Write about the external structure of the heart?
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The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium. The heart pumps blood with a rhythm determined by a group of pacemaking cells in the sinoatrial node.
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enclosed in a protective sac, present behind the ribcage and lungs
contains many heart muscles, which are covered by coronary arteries and veins, which supply heart muscle (or cardiac muscle) with oxygen and glucose and take CO2 away, respectively
about the size of ur fist...
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