The main vein carries deoxygenated blood from all the parts of the body except lungs , back to the heart. Please note that the main differences between an artery and a vein are that an artery carries blood from the heart to the body organs whereas a vein carries blood from the body organs back to the heart.
We have just studied that the heart is a kind of pump which pumps blood around our body continuously, without stopping. Actually, heart is not a single pump. Heart is really a double pump. The left side of heart left atrium and left ventricle acts as one pumps which pumps blood into the whole body, except the lungs. The right side of heart right atrium and right ventricle acts as another pump which pumps blood only into the lungs. We can see from that the left side of heart is completely separated from the right side by a partition called septum.
So, the two pumps in the heart work independently. The separation of left and right sides of the heart is necessary to prevent the mixing of the oxygenated blood on the left side with the deoxygenated blood on the right side. Before we describe the circulation of blood in the human body with the help of a diagram, we should keep the following two points in mind: First that the blood circulates in our body in two forms: The blood carrying oxygen in it is called oxygenated blood.
We get oxygenated blood in the lungs where the fresh oxygen of air passes into the blood. The blood having no oxygen in it is called deoxygenated blood. The deoxygenated blood is formed in all the organs of the body except the lungs.
This is because when the oxygenated blood passes through the organs of the body, the body cells use up its oxygen and make it deoxygenated. The deoxygenated blood, however, carries carbon dioxide in it which is produced during respiration in body cells. The second point to remember is that when blood circulates in the body, then it supplies oxygen, digested food and other chemicals like hormones to all the cells of the body.
It also carries back waste products like carbon dioxide, etc. The heart beats non-stop all the time. The heart beat is due to the rhythmic contraction and relaxation of the heart muscles which make up the atria and the ventricles. Please note that the two atria left atrium and right atrium contract together and relax together. Similarly, the two ventricles left ventricle and right ventricle contract together and relax together.
The contraction of two atria is immediately followed by the contraction of the two ventricles. The heart beats or beating of heart circulates the blood in the human body. We will now describe the circulation of blood in the human body with the help of a highly simplified diagram.
When the muscles of all the four chambers of the heart are relaxed, the pulmonary vein brings the oxygenated blood oxygen-carrying blood from the lungs into the left atrium of the heart. When the left atrium contracts, the oxygenated blood is pushed into the left ventricle through the valve V 1.
When the left ventricle contracts, the oxygenated blood is forced into the main artery called 'aorta'. This main artery then branches into smaller arteries which go into different body organs except the lungs. The smaller arteries called arterioles further branch into capillaries The smaller arteries and capillaries have not been shown in Figure 88 to keep the diagram simple.
The main artery carries blood to all the organs or parts of the body like head, chest, arms, stomach, intestines, liver, kidney, trunk and legs except the lungs. When the oxygenated blood passes through the capillaries of the body organs, then it gives oxygen to the body cells. Since the blood loses oxygen here, we say that the blood has been deoxygenated.
The blood also gives the digested food and other dissolved materials to the body cells. At the same time, carbon dioxide produced as a waste material during respiration enters into the blood. The deoxygenated blood carrying carbon dioxide from the body organs enters into the main vein called vena cava.
The main vein carries the deoxygenated blood to the right atrium of the heart. When the right atrium contracts, deoxygenated blood is pushed into the right ventricle through the valve V 2. And when the right ventricle contracts, the deoxygenated blood are pumped into the lungs through the pulmonary artery.
In the lungs, deoxygenated blood releases its carbon dioxide and absorbs fresh oxygen from air. Weighing between 7 and 15 ounces, the human heart is generally about the same size as the indiv This paper considers the existing status of the universal or national health care system in Canada In nine pages information systems development is examined in a consideration of four methodologies including Information Systems w But what about th New to eCheat Create an Account!
The Circulatory System The Circulatory System Circulatory System is the combined function of the heart, blood, and blood vessels to transport oxygen and nutrients to organs and tissues throughout the body and carry away waste products.
Professionally written essays on this topic: Overview of the Circulation System for Humans In five pages this paper examines the human circulatory system in a consideration of the heart's 4 chambers, the veins, and the ar Overview of the Cardiovascular System a healthy body, are voluntary muscles and contract when the brain sends a signal telling them to react, making movement possible.
An Overview of Body Systems and Function the pancreatic islets are regulated by blood glucose concentrations Saladin, Cardiovascular System arteries Human Anatomy Online. Student Case Study on Systems Development requires a different access level, with the ability to process data to produce the final results, bringing the different results t The documents downloaded from eCheat. An aortic aneurysm occurs when a section of the aorta bulges, stretches, and swells.
This bulge can weaken the aorta to the point that it bursts, releasing blood into the body. Bleeding from an aortic aneurysm is a medical emergency that can be caused by high blood pressure, smoking, aging, high cholesterol, and a positive family history. Heart disease occurs when the blood vessels that supply oxygen to the heart narrow and stiffen. Smoking, an unhealthy diet, stress, and a sedentary lifestyle all ncrease the risk of heart disease.
A heart attack or stroke can occur if the condition is untreated. Varicose veins are another common disease of the circulatory system that happens when veins in the legs twist, swell, and become painful. Aging, pregnancy, prolonged standing, and defective valves can all contribute to the development of varicose veins. Most of the time varicose veins can be treated by elevating the lower extremities, avoiding prolonged standing or sitting positions, and wearing supportive stockings.
Home Essays Circulatory system. Circulatory system 6 June We will write a custom essay sample on. A limited time offer!
So, the human circulatory system consists of the heart, arteries, veins, capillaries, and blood. In the circulatory system, the heart acts as a pump to push out blood. The arteries, veins and capillaries act as pipes (or tubes) through which the blood flows.
- The Circulatory System The circulatory system in anatomy and physiology is the course taken by the blood through the arteries, capillaries, and veins and back to the heart. In humans and the higher vertebrates, the heart is made up of four chambers the right .
The human circulatory is one of, if not the, most important systems in the body. It consist of such organs as the heart and lungs. However every organ and organ system in the body is nourished and kept alive through the use of the circulatory system. The main organ in the circulatory system is the /5(2). This essay has been submitted by a student. This is not an example of the work written by our professional essay writers. Circulatory System is the combined function of the heart, blood, and blood vessels to transport oxygen and nutrients to organs and tissues throughout the .
Page 2 Circulatory system Essay. of the circulatory system that is able to drain this excess fluid and its accompanying waste products out the tissues. ere it can be taken by the blood to the various organs that remove It from the body. Free Essay: The Human Circulatory System The human circulatory is one of, if not the, most important system in the body. “It consists of such organs as the.