with help of diagram explain human heart
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HUMAN HEART;
➛The human heart is four chambered. There are two atria (auricles) and two ventricles.
➛The auricles are thin walled compared to the ventricles. The right auricle and left auricle are separated by the interauricular septum.
➛The aperture in the right ventricle is as sinu-auricular aperture. This aperture is guarded by valves. The pulmonary vein opens in the left auricle through an oblique aperture. There are no valves at this aperture.
➛The two auricles are separated from the ventricles by auriculo-ventricular septum. The right and left auricle open into the ventricle through auriculo-ventricular aperture.
➛The auriculo ventricular aperture is guarded by auriculo ventricular valve. This valve has four flaps. Chordae tendinae are attached to the margin of the four flaps of this valve.
➛ Chordate tendinae are thread like chords which are attached to the muscular wall of the ventricle at their other ends.
➛Truncus arteriousus arises from the anterior and ventral part of the ventricle. This part runs obliquely on the ventral surface of the right auricle.
➛There are three semilunar valves at the proximal end in the truncus arteriosus. The basal, broad and thick-walled portion of the truncus arteriosus is known as conus arteriosus.
➛The anterior, thin walled and narrow portion of the truncus arteriosus is known as ventral aorta.
➛There is spinal valve in the conus arteriosus. This valves divides the lumen of conus arteriosus into a left cavum pulmocutaneum and right cavum aorticum.
➛The blood entering the cavum pulmocataeum enters through pulmocutaneous arches.
➛The ventral aorta divides into two lateral aortae. Each lateral aorta is divided into two arches, carotid arch and systemic arch.
The heart is roughly cone shaped hollow organ. It is approximately the size of owner’s closed fist and weighs about 250-300 gm in female and 300-350gm in the male. The heart lies in the thoracic cavity in the space between the lungs (mediastinum) anterior to the vertebral column and posterior to the sternum.
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