Involvement in cardiac physiotherapy and rehabilitation in health policies will ensure scientific development and economic efficiency in preventive approaches and treatment studies
The heartmuscle or myocardium is a striatedmusclelikeskeletalmuscle, The individual fibers are multicore cells and these cells are connected with each other, When a cell is stimulated or depolarized, the action potential spreads across all cells of the myocardium to allow the heart to function as a unit
Takes oxygenated blood from the lungs and pushes the blood into the thick-walled muscular aorta, Thus, systemic circulation is distributed throughout the body
Atrioventricular caps: provides passage from the atrium to the ventricle in the right heart with the tricuspid valve, allowing passage of the mitral or bicuspid valve from the left atrium to the left ventricle in the left heart
The relatively thin-walled atrial chambers perform blood collection and storage during ventricular contraction, 70% of the blood returned to the atria is directly into the ventricles before the atrium contraction, The simultaneous contraction of each 2 atrium ensures that the remaining blood passes to the ventricles
This short range increases ventricular tension, The heart volume and fiber length do not change. This is called the isometric phase of the heart. When ventricular pressure increases and exceeds arterial pressure, blood is removed from the heart
The walls of the arterioles consist of smooth muscles which are placed in circular layers, Arterioles regulate peripheral blood flow through contraction and relaxation, Vascular bed that regulates blood flow quickly and effectively by changing the inner diameter of the vessels, Redistribution function is especially important during exercise
A blood flow enters the aorta with every contraction of the left ventricle, Some of the blood pumped from the heart is stored in the aorta, This creates a pressure in the entire arterial system and causes a pressure wave to reach distant branches of the arterial down from the aorta, During a cardiac cycle, this tension and then rebound of the arterial wall is heard as a characteristic pulse in any superficial artery of the body in healthy individuals
The maximum pressure on the heart during each systole or contraction of the left ventricle is 120 mmHg at rest, Systolic pressure gives an idea about the load of the heart and its tension against the arterial wall during ventricular contraction
During diastole or during the relaxation phase of the cardiac cycle, the arterial blood pressure drops to 70-80 mmHg, Diastolic pressure is an indicator of peripheral resistance or shows the ease of blood flow from the arterioles to the capillaries
Arterioles form metarteriols. They terminate with capillaries, a microscopic network. It contains a single layer of endothelial cells in the capillary wall, Some capillaries are so narrow that they allow 1 blood cell to pass, The capillary density in human skeletal muscle is 2000-3000 capillary / mm tissue2
The diameter of the capillary opening is controlled by a smooth muscle ring called a precapillary sphincter, Sphincter is very important during exercise. Because it provides localized capillary blood flow regulation to meet metabolic requirements in a particular tissue
The continuity of the vascular system continues where the capillaries are fed with oxygen-free blood and opened to venules or small veins, The pressure in the systemic circulation is different. In the aorta and large arteries, blood pressure ranges from 120-80 mmHg throughout the cardiac cycle. Then the pressure decreases in proportion to the resistance encountered in the vascular circuit, The average pressure at the end of the arterioles of the capillaries is 30 mmHg. As the blood enters the veins, the resistance to the blood flow completely disappears. In time, the blood reaches the right atrium. Pressure has dropped down to zero
Veins have thin membranous flap covers. They are located at short intervals along the vein. Allow one-way flow to the heart, Because the veins are under pressure, they compress with the smallest muscular contraction and even the smallest pressure change in the chest cavity during breathing
Sometimes the flaps are faulty and may not be successful in a one-way shot of the blood. For example, the varicose vein is caused by the inability of the blood flow to resist gravity especially in the vertical veins of the lower extremities. Blood is collected in these veins, The veins are stretched and painful. In severe cases, the venous wall is degenerated. In this case, the vessel should be surgically removed
Compelling exercise should be avoided. In such contractions, the muscle and the ventilatory pump are significantly inadequate to assist with venous return. It causes pooling of the lower extremities and agitation of the varicose veins
The amount of blood pumped from the left ventricle in 1 min, The primary indicator of the functional capacity of circulation, Cardiac output= Heart Rate x Stroke Volume