Human cardiovascular system _ anatomy _ britannica. com

Human cardiovascular system , organ system that conveys blood through vessels to and from all parts of the body, carrying nutrients and oxygen to tissues and removing carbon dioxide and other wastes. Human body parts quiz It is a closed tubular system in which the blood is propelled by a muscular heart. All parts name of human body Two circuits, the pulmonary and the systemic, consist of arterial, capillary, and venous components.

The primary function of the heart is to serve as a muscular pump propelling blood into and through vessels to and from all parts of the body.

Name the parts of human body The arteries, which receive this blood at high pressure and velocity and conduct it throughout the body, have thick walls that are composed of elastic fibrous tissue and muscle cells. Parts of a human body The arterial tree—the branching system of arteries—terminates in short, narrow, muscular vessels called arterioles, from which blood enters simple endothelial tubes (i.e., tubes formed of endothelial, or lining, cells) known as capillaries. Human parts of the body picture with names These thin, microscopic capillaries are permeable to vital cellular nutrients and waste products that they receive and distribute. Human body parts name list From the capillaries, the blood, now depleted of oxygen and burdened with waste products, moving more slowly and under low pressure, enters small vessels called venules that converge to form veins, ultimately guiding the blood on its way back to the heart.

This article describes the structure and function of the heart and blood vessels, and the technologies that are used to evaluate and monitor the health of these fundamental components of the human cardiovascular system. Human body parts images for kids For a discussion of diseases affecting the heart and blood vessels, see the article cardiovascular disease. Human body parts starting with c For a full treatment of the composition and physiologic function of blood, see blood, and for more information on diseases of the blood, see blood disease. About human body parts To learn more about the human circulatory system, see systemic circulation and pulmonary circulation, and for more about cardiovascular and circulatory function in other living organisms, see circulation. Human body parts names The heart

The human adult heart is normally slightly larger than a clenched fist with average dimensions of about 13 ? 9 ? 6 centimetres (5 ? 3.5 ? 2.5 inches) and weighing approximately 10.5 ounces (300 grams). Parts of human body in tamil It is cone-shaped, with the broad base directed upward and to the right and the apex pointing downward and to the left. Human body parts name in english with picture It is located in the chest ( thoracic) cavity behind the breastbone ( sternum), in front of the windpipe ( trachea), the esophagus, and the descending aorta, between the lungs, and above the diaphragm (the muscular partition between the chest and abdominal cavities). Human body parts heart About two-thirds of the heart lies to the left of the midline.

The heart is suspended in its own membranous sac, the pericardium. Body parts of human and their function The strong outer portion of the sac, or fibrous pericardium, is firmly attached to the diaphragm below, the mediastinal pleura on the side, and the sternum in front. Human body main parts It gradually blends with the coverings of the superior vena cava and the pulmonary (lung) arteries and veins leading to and from the heart. Parts of human body with picture (The space between the lungs, the mediastinum, is bordered by the mediastinal pleura, a continuation of the membrane lining the chest. Human full body parts The superior vena cava is the principal channel for venous blood from the chest, arms, neck, and head.)

Smooth, serous (moisture-exuding) membrane lines the fibrous pericardium, then bends back and covers the heart. Images of body parts of human The portion of membrane lining the fibrous pericardium is known as the parietal serous layer (parietal pericardium), that covering the heart as the visceral serous layer (visceral pericardium or epicardium).

The two layers of serous membrane are normally separated only by 10 to 15 millilitres (0.6 to 0.9 cubic inch) of pericardial fluid, which is secreted by the serous membranes. Human body parts name with picture in tamil The slight space created by the separation is called the pericardial cavity. Human being body parts The pericardial fluid lubricates the two membranes with every beat of the heart as their surfaces glide over each other. Human body parts name in english Fluid is filtered into the pericardial space through both the visceral and parietal pericardia. Human body parts and names Chambers of the heart

The heart is divided by septa, or partitions, into right and left halves, and each half is subdivided into two chambers. Parts of the human body inside The upper chambers, the atria, are separated by a partition known as the interatrial septum; the lower chambers, the ventricles, are separated by the interventricular septum. Human body internal parts name in hindi The atria receive blood from various parts of the body and pass it into the ventricles. Parts of the human body in english The ventricles, in turn, pump blood to the lungs and to the remainder of the body.

The right atrium, or right superior portion of the heart, is a thin-walled chamber receiving blood from all tissues except the lungs. Human inside body parts Three veins empty into the right atrium, the superior and inferior venae cavae, bringing blood from the upper and lower portions of the body, respectively, and the coronary sinus, draining blood from the heart itself. Hairy parts of human body Blood flows from the right atrium to the right ventricle. Human body parts names in english with picture The right ventricle, the right inferior portion of the heart, is the chamber from which the pulmonary artery carries blood to the lungs.

The left atrium, the left superior portion of the heart, is slightly smaller than the right atrium and has a thicker wall. Human body parts with name The left atrium receives the four pulmonary veins, which bring oxygenated blood from the lungs. Name of human body parts with image Blood flows from the left atrium into the left ventricle. Parts of human body for kindergarten The left ventricle, the left inferior portion of the heart, has walls three times as thick as those of the right ventricle. Human body parts list alphabetical Blood is forced from this chamber through the aorta to all parts of the body except the lungs. Human outer body parts External surface of the heart

Shallow grooves called the interventricular sulci, containing blood vessels, mark the separation between ventricles on the front and back surfaces of the heart. Human full body parts name There are two grooves on the external surface of the heart. Human body pictures with parts name One, the atrioventricular groove, is along the line where the right atrium and the right ventricle meet; it contains a branch of the right coronary artery (the coronary arteries deliver blood to the heart muscle). Picture of human body parts with names The other, the anterior interventricular sulcus, runs along the line between the right and left ventricles and contains a branch of the left coronary artery.

On the posterior side of the heart surface, a groove called the posterior longitudinal sulcus marks the division between the right and left ventricles; it contains another branch of a coronary artery. Human body parts name with picture in english pdf A fourth groove, between the left atrium and ventricle, holds the coronary sinus, a channel for venous blood.

Articles from Britannica encyclopedias for elementary and high school students. Human body parts that start with f cardiovascular system – Children’s Encyclopedia (Ages 8-11)

Humans and many other animals depend on blood flowing through their bodies to keep them alive. Parts of the human body in french The blood travels through a system that includes the heart and a network of blood vessels. Human upper body parts This is called a cardiovascular system. Body parts of a human Article Contributors

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