The heart and circulation of blood essay

Similarly the valve separating the left atrium from the left ventricle is called as the left artrio-ventricular valve mitral valve and is composed of two flaps of cusps. Essay on the structure and functions of Heart for students Ashiya Advertisements: Hence, the digested food stuff in the alimentary canal are absorbed into the capillaries which go to make up the portal vein and are carried by it into the liver.

It weights about gm. The septum divides the two sides of the heart and four one way valves control the blood flow. The blood from all these organs unites to form the portal vein and carried to the liver.

Essay on the structure and functions of Heart for students

It contains enormous amounts of protein called haemoglobin, which is responsible for its dark or bright red colour. Each side is subdivided into an upper and lower chamber.

The alveoli has an enormous surface area due to the blood vessels and capillaries, the walls are moist and thin, this is because of a substance secreted inside the alveoli known as surfactant and is produced by specialized cells.

On the contrary, its deoxygenated blood or the venous return is by the coronary sinus which empties into the right atrium. The systemic loop begins when the oxygen-rich blood coming from the lungs enters the upper left chamber of the heart, the left atrium.

They are the only true cells in the blood and are The heart and circulation of blood essay limited to the blood stream. It is made up of four chambers, two upper chambers known as Atria and two lower, thicker walled chambers, known as Ventricles.

This is achieved in the portal circulation. Refer to diagram Taylor, Cancer Research, [2] Plasma: They can squeeze contract to send blood rushing out. Within the lungs these arteries divide and subdivide into smaller arteries, subsequently becoming arteries and capillaries.

The blood then returns to the heart via the veins. Abdominal muscles help the lungs to expand and contract in order for us to inhale and exhale. Plasma is the fluid part of blood and makes up the most volume.

It has a strong muscular wall and is made up of a special type of muscle known as myocardium, which is only found in the heart. When the ventricle contracts, the blood is pushed into the pulmonary artery that branches into two main parts: At the site of an injury, platelets will stick to the exposed collagen and trap other blood cells in the form of a clot and stop blood from flowing and preventing excessive blood loss.

The capillaries containing carbon dioxide return this used blood to the heart through a different series of branching tubes: In order that these materials can come in contact with the liver cells for metabolism, it is necessary for the blood to pass through a second set of capillaries.

When you exhale carbon dioxide leaves the body the same way oxygen was taken in. In each lung the capillaries carrying oxygenated blood join up and form two vein, so, two pulmonary veins from each lung, therefore becomes four pulmonary veins which return oxygenated blood to the left atrium of the heart.

These valves are formed by three half-moon shaped semi lunar cusps. Thrombocytes these are cell fragments that help in blood clotting. From here the blood begins its journey through the pulmonary cycle.

This is the outermost layer of the heart, made up of connective tissue. Then the walls of the ventricles squeeze together and force the blood out into the arteries: The veins, in turn, unite with each other to form larger veins until the blood from the body is finally collected into the large veins that empty into the heart.

The heart is supplied with arterial blood by the right and left coronary arteries. Flow of blood through the heart The heart acts as a pump which drives blood into and through the arteries, but the right and left side of the heart of function quiet separately from one another. These capillaries again unite to form two or three large hepatic veins which leave the liver to join the inferior Vena Cava.

The Pulmonary Circulation 3. From the veins, it enters the heart again through the left atrium. The heart is a hollow muscular, cone-shaped organ, lying between the lungs in a block of tissue called the mediastinum. Also the valves are prevented from opening upwards by the Chordate tendineae tendinous cordswhich originate in the papillary muscles in the walls of the ventricle.

Because the surface area of the alveoli is so big this enables gas exchange to take place more efficiently. Both the openings of the pulmonary artery and the aorta are also guarded by valves as pulmonary and aortic valves respectively. In the liver substance, the portal vein breaks up into smaller veins and finally into capillaries.The blood is circulated by the heart, which pumps the oxygenated blood from the lungs to the body.

Additionally, the two body systems work together to remove carbon dioxide, which is a metabolic waste product. 3. The Heart and Blood Circulation Essay Words | 2 Pages.

The Heart and Blood Circulation The heart is a four chambered muscular pump around the size of a fist. It beats abouttimes a day pumping around 2, gallons of blood through aboutmiles of organic tubing.

The heart is a big muscle with four valves connected. For the blood to get back to the heart, the liver empties the clean blood into the hepatic vein, leading to the inferior vena cava, which pumps blood into the heart’s right atrium.

Free Science essays

The cycle then begins again, as the blood in the right atrium makes its way into the pulmonary circuit again. - The Circulatory System: Blood Group 1 Questions 1.

List the components of the circulatory system. The three components of the circulatory system are the heart, the blood vessel, and also the blood. 2. Describe the components of the blood: Plasma and formed elements.

List how the formed elements are classified. Formed elements are. Branching Blood Vessels.

5. The Circulation of Blood * picture of the heart and its parts * picture of the body and some of its organs. Location of the Heart. The center of the circulatory system is the heart, which is the main pumping mechanism.

The heart is made of muscle. The heart is shaped something like a cone, with a pointed bottom and a. Circulatory System Essay System Working that muscle heart is a muscle little left of the middle of your chests about the size of fist heart sends blood around body blood provides body with oxygen and nutrients it needs carries away waste heart is Pulmonary circulation is where the blood from the entire body is transported to the .

The heart and circulation of blood essay
Rated 4/5 based on 85 review