How is the mammalian heart structurally adapted to its function.

-It has valves; which prevent the back flow of blood;
-Cuspid valves have tendons/tendinous cords/strands of connective tissues /chordaetendinae/ cordaetendinae; that prevent the valves from turning inside out (evert) during systole/when ventricles contract;
-The ventricles have thicker walls; to generate high pressure to pump blood;
-The wall of left ventricle thicker than the right ventricle; to pump blood over longer distance;
-It has cardiac muscles; which contract and relax continuously without fatigue;
-The cardiac muscles are myogenic; (i.e. contract and relax without nervous stimulation).
-Cardiac muscles are interconnected/a cyncitium/ form a network of fibres; to rapidly and uniformly spread the contractions;
-The cardiac muscles have numerous mitochondria; to generate energy for the muscular contraction;
-It has sino atrial node (SAN); that acts as pace maker;
-It has atrioventricular node (AVN); which relay contraction waves from sino atrial node (SAN) to the purkinje tissue/ bundle of HIS;
-Has purkinje tissue/fibres; to relay waves from the atrioventricular node (AVN) to the ventricular myocardium;
-It has coronary artery; to nourish the heart/ supply nutrients and oxygen to the heart muscles;
-It has coronary vein; to remove Carbon (IV) oxide and metabolic wastes;
-It is divided into four chambers; for the atria to receive blood; and the ventricles to pump blood out of the blood;
-It has a septum; to prevent the mixing of oxygenated and deoxygenated blood/for double circulation;
-It is enclosed by pericardium; to prevent over dilation/ overstretching of the heart/keep the heart in position;
-The pericardium secretes pericardial fluid; to reduce friction /lubricate the heart/absorb the shock;
-Has vena cava and pulmonary vein; to supply blood to the heart;
-Has aorta and pulmonary artery; to transport blood away from the heart;