The heart is the organ that pumps the blood throughout the body. It has three chambers: the atria, the ventricles, and the septum. It also contains two main valves: the tricuspid and the bicuspid (the atrioventricular valves). It has two sections that carry the different types of blood (oxygenated and deoxygenated). The oxygen depleted blood goes through the right atrium to the right ventricle.
Heart is made up of muscle and it has walls. It contacts to pump blood into the blood vessels and all over your body. The heart beats to maintain the blood circulating. The heart beating leads the cardiac cycle and which pumps blood to the cells and tissues of the body. The veins supply the deoxygenated blood from the body to the right side of heart.
The systemic circuit carries oxygenated blood through the aorta from the left ventricle of the heart to all over the body, through capillaries. Having deposited most of the oxygen the blood flows back through the veins, into the right atrium through the vena cava. In this circuit the blood visits the cardiac muscle of the heart, the stomach, the intestines and liver, the muscles and skin. Oxygen transported through this system is vital for physical activity.
The pulmonary valve prevents the blood from flowing back into the right ventricle. The pulmonary artery carries the blood to the lungs. There the blood picks up oxygen and is returned to the left atrium of the heart by the pulmonary veins. In the next diastole period, the semilunar valves close and the atrioventricular valves open. Blood from the pulmonary veins fills the left atrium.
Heart wall thickness varies from part to the part and from person to person. For example the atria part of the heart has thinner layer of myocardium than ventricular because atria does not pump blood far. In ontrast, ventricles owns a very thick layer of myocardial in order t... ... middle of paper ... ... valves to open and the AV valves to close by pressure of the ventricles . By this way valves allows for blood flow from the ventricles into the arteries. This phase is called Repolarization then is prepare to the state of diastolic during this phase.
It is located within the mediastinum or medial cavity of the thorax. The heart is enclosed within a double walled pericardium, a fibroserous sac. The pericardium has a superficial fibrous pericardium and deep two-layer serous pericardium. The parietal layer lines the fibrous pericardium and; on the other hand, the visceral layer lines the surface of the heart. The pericardium protects and anchors the heart; prevents overfilling of blood; and helps to work in a friction-free environment.
The cardiovascular system, also known as a circulatory system, is an organ system that permits blood to circulate and transport oxygen, carbon dioxide, nutrients, hormones, and blood cell to and from the cells in the body to provided nourishment, help in fighting disease, stabilize temperature, and maintain homeostasis. The three components of the cardiovascular system are the heart, blood vessels, and blood. This system can be divided into two primary circulatory loops, the pulmonary circulation loop and the systemic circulation loop. The cardiovascular system is powered by the body’s hardest-working organ, the heart. Being roughly the size of an adult males clenched fist, it contracts and relaxes about 70 to 80 times per minute pushing
They arise in the interstitial spaces of organs and tissues and they then join with the large veins just before they enter the vena cava of the heart. These lymphatic vessels tend to run parallel with the veins which allows filtration to occur. The vessels are non- muscular and contain valves which stop the fluid from going back. (Hastie, 2012). Lymph Fluid: Is excess tissue fluid that is found throughout the body in the lymph node, spleen and thymus.
It functions as a structural supporter and provides electrical insulation between the atria and ventricles. This is important for timing and coordination of electrical and contractile activity. There are four important chambers that are inside of the heart and play important roles in the circulation of blood: Right/ Left Atrium and Right/ Left Ventricles. The superior half of the heart, both atriums, are thin walled receiving chambers for blood returning to the heart. Both ventricles, inferior half, eject blood into the arteries and keep it flowing throughout the body.
Structure, Function & Enzymes The Circulatory System The human circulatory system, or cardiovascular system, is made up of the heart, blood and blood vessels. The circulatory system has three functions: transportation of substances, protection from disease and regulation of temperature. The heart pumps blood to our body tissues via a network of blood vessels. Humans have a closed circulatory system that is in two parts; the systemic circulation and the pulmonary circulation. The systemic system carries oxygenated blood around the body and deoxygenated blood back to the heart, the pulmonary system carries deoxygenated blood from the heart to the lungs, and the oxygenated blood from the lungs back to the heart.