It is made up of four chambers, two upper chambers known as Atria and two lower, thicker walled chambers, known as Ventricles. It has a strong muscular wall and is made up of a special type of muscle known as myocardium, which is only found in the heart.
Essay on Human Heart: The human heart is pinkish about the size of a fist and weighs approx. It is a hollow, highly muscular, cone-shaped structure located in the thoracic cavity above the diaphragm in between the two lungs.
It is protected by rib cage.
The narrow end of the triangular heart is pointed to the left side, during working this end gives a feeling of the heart being on the left side. Heart is right in the centre between the two lungs and above the diaphragm in the ribcage. The narrow end of the roughly triangular heart is pointed to the left side and during working the contraction of the heart is most powerful at this end giving a feeling of the heart being on the left side.
The space between the two layers is filled with fluid called pericardial fluid. This fluid protects the heart from external pressure, push, shock and reduces friction during the heart beat and facilitates free heart contraction. The heart consists of four chambers.
The two thin walled auricles which are upper chambers right and left. Right and left auricles are separated from each other by an inter-auricular septum. Right auricle receives deoxygenated blood from the body parts by anterior and posterior vena cava.
The two thick walled lower chamber right and left are called ventricles.
Right and left ventricles are separated by an inter-ventricular septum. The walls of left ventricle are much thicker as it supplies blood to large distance and up to the brain against gravity.
The left ventricle has chordae tendinae and papillary muscles which prevent tricuspid and bicuspid valves from being pushed into auricles at the time of ventricular contraction. Blood Vessels Entering and Leaving the Heart: It brings deoxygenated blood from anterior body parts head, neck, chest and arms to the right auricle.
It brings deoxygenated blood from posterior or lower body parts i. It arises from right ventricles and carries deoxygenated blood to the lungs for oxygenation.
It arises from each lung and brings oxygenated blood from lungs to left auricle. It arises from left ventricles and carries oxygenated blood to supply it to all body parts. Abdominal aorta is the largest artery.
There are two coronary arteries right and left, arising from the base of aorta and supply blood to heart muscles, blockage at these arteries result a myocardial infraction or heart attack.
Valves in the Heart: Right atrio-ventricular valve Tricuspid valve -Located at the opening between right auricle and right ventricle.
Present at the opening of right ventricle into pulmonary artery. Located at the point of origin of aorta from left ventricle. Pacemaker tissues of the Heart: Sino Atrial Node S. It is located at the junction of superior vena cava with right auricle it initiates and maintains the myocardial activity and its rhythmicity, called pace maker of heart.
Located posteriorly on right side of the interatrial septum near coronary sinus, in the destruction of S. The function of pace maker can be taken up by the A.
Node along interventricular septum at the top. Impulses travel along bundle of HIS on to ventricles. Located at the terminal divisions of right and left branch of the bundle of HIS. The South African Surgeon Dr. In he received an M. The patient, 53 years old dentist Louis Washkansky, was given the heart of a 25 years old auto crash victim named Denise Darvall.
The pumping action of heart Fig.
The alternate contraction and relaxation dilation continues regularly. The waves of contraction is initiated by Sino-auricular node S. Node situated on inner wall of right auricle.The Heart Essay examples. Words 8 Pages “The heart” The Heart is a very important organ in the body.
It is what keeps your blood flowing and your organs going. It is a tireless muscle that pumps more than two thousand gallons of blood every day. The blood that . Heart Assignment The human heart is located in the middle of the thorax but slightly to the left. The left ventricle is slightly larger than the right so it takes up more space in the left side of the thorax and therefore makes the left lung smaller.
The Heart and Blood Circulation Essay Words 2 Pages The Heart and Blood Circulation The heart is a four chambered muscular pump around the size of a fist. Heart The heart is a hollow, muscular, double pump that circulates the blood through the blood vessel to all parts of the body. Surrounding the heart is double layers of fibrous tissue call the pericardium 3 / Lab report The body's circulation has two parts, with the heart acting as a double pump.
Oct 14, · Words: Length: 2 Pages Document Type: Essay Paper #: Tell-Tale Heart Philosophy of Composition in the "Tell-Tale Heart" The central elements of this philosophy used by Edgar Allan Poe are length, method, and unity of effect (Xroads ).
The heart is a muscle, which many people don't know. Your heart is about the size of your fist, and is not in the normal heart shape. The heart has four chambers filled with blood.