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Heart Physical features: The heart consists of: - Muscle tissue (Cardiac muscle) - Coronary blood vessels (Carries blood to/from the heart-actually supplying the heart itself) - Conducting tissue (SAN, AVN, sets the basal rhythm) - Connective tissue (Moderator bands-especially in Left Ventricle, interventricular septum) - Epicardial fat (energy store) The above image is from http://www.biosci.uga.edu/almanac/bio_104/notes/may_7.html. The heart is a muscular organ (rich in myoglobin-an oxygen storage molecule, giving it a deep red colour) enclosed in a fibrous sac, the pericardium, and located in the chest (thorax). The narrow space between the pericardium and the heart is filled with a watery fluid that serves as a lubricant as the heart moves within the sac. The inner surface of the myocardium (cardiac muscle cells) is lined by a thin layer of cells known as endothelial cells or endothelium. The heart is divided into right and left halves, each consisting of an atrium and a ventricle. Located in each half of the heart...

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