The human circulatory system

March Other animals While humans, as well as other vertebrateshave a closed cardiovascular system meaning that the blood never leaves the network of arteriesveins and capillariessome invertebrate groups have an open cardiovascular system.

The human circulatory system

Two pumps in a single heart one to pump deoxygenated blood to the lungs; the other to pump oxygenated blood to all the other organs and tissues of the body.

A system of blood vessels to distribute blood throughout the body Specialized organs for exchange of materials between the blood and the external environment; for example organs like the lungs and intestine that add materials to the blood and organs like the lungs and kidneys that remove materials from the blood and deposit them back in the external environment.

The heart is located roughly in the center of the chest cavity. It is covered by a protective membrane, the pericardium.

Deoxygenated blood from the body enters the right atrium. It flows through the tricuspid valve into the right ventricle. The term tricuspid refers to the three flaps of tissue that make up the valve.

Contraction of the ventricle then closes the tricuspid valve and forces open the pulmonary valve. Blood flows into the pulmonary artery. This branches immediately, carrying blood to the right and left lungs.

Here the blood gives up carbon dioxide and takes on a fresh supply of oxygen [ More ]. The capillary beds of the lungs are drained by venules that are the tributaries of the pulmonary veins. Four pulmonary veins, two draining each lung, carry oxygenated blood to the left atrium of the heart Below: Oxygenated blood is shown in red; deoxygenated blood in blue.

Note that the blood draining the stomach, spleen, and intestines passes through the liver before it is returned to the heart. Here surplus or harmful materials picked up from those organs can be removed before the blood returns to the general circulation.

Contraction of the ventricle closes the mitral valve and opens the aortic valve at the entrance to the aorta.

The human circulatory system

The first branches from the aorta occur just beyond the aortic valve still within the heart. Two openings lead to the right and left coronary arteries, which supply blood to the heart itself. Although the coronary arteries arise within the heart, they pass directly out to the surface of the heart and extend down across it.

They supply blood to the network of capillaries that penetrate every portion of the heart.

BBC Bitesize - KS2 Science - Circulatory system

The capillaries drain into two coronary veins that empty into the right atrium. Arteriosclerosis The coronary arteries arise at the point of maximum blood pressure in the circulatory system. Over the course of time, the arterial walls are apt to lose elasticity, which limits the amount of blood that can surge through them and hence limits the supply of oxygen to the heart.The circulatory system is a vast network of organs and vessels that is responsible for the flow of blood, nutrients, hormones, oxygen and other gases to and from cells.

Without the circulatory.

The human circulatory system functions to transport blood and oxygen from the lungs to the various tissues of the body. The heart pumps the blood throughout the body. The lymphatic system is an extension of the human circulatory system that includes cell . The remainder of the system is known as the systemic circulation. The graphic shows the major arteries (in bright red) and veins (dark red) of the system. Blood from the aorta passes into a branching system of arteries that lead to all parts of the body. For the circulation of blood and food to all the parts of human body, human circulatory system is built and circulatory system diagram show its parts, names.

The human circulatory system or the cardiovascular system circulates blood and other essential nutrients throughout the body with the help of blood vessels. It is also an organ system whose main function is to transport lymph, hormones, gases and dispel wastes.

Human Circulatory System

The main organ of the circulatory system is . Cardiovascular System Physiology Functions of the Cardiovascular System. The cardiovascular system has three major functions: transportation of materials, protection from pathogens, and regulation of the body’s homeostasis. Transportation: The cardiovascular system transports blood to almost all of the body’s tissues.

The blood delivers essential nutrients and oxygen and removes wastes and carbon . The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic).

The human circulatory system functions to transport blood and oxygen from the lungs to the various tissues of the body. The heart pumps the blood throughout the body.

The lymphatic system is an extension of the human circulatory system that includes cell . The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic).

The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.

Human Circulatory System