Which vessels carry oxygen poor blood

Some are known to be associated with genetic disorders, such as Down syndrome, but the cause of most congenital heart defects is unknown. While they can't be prevented, there are many treatments for the defects and related health problems. Each beat is caused by the contraction squeezing of your heart. These waves are bounced off the parts of the heart, creating a picture of the heart that is displayed on a monitor. Sticky pads electrodes are placed on the chest and hooked up to a machine that records the heart activity onto paper or a monitor.

A doctor can interpret the EKG to see the heart beating and determine if it's normal. It pumps blood through blood vessels around the body and sits inside the chest, protected by the ribcage.

The blood carries oxygen and other nutrients your body needs. The circulatory system is composed of the heart and blood vessels, including arteries, veins, and capillaries.

In some people, there's an extra noise that the blood makes as it flows through the heart. This sound is called a murmur. They're commonly heard in healthy kids with normal hearts, but an abnormal heart murmur can mean a person has a heart defect or heart valve problem. This condition is usually diagnosed within the first few days of life.

They work without us even thinking about them. The heart is an involuntary muscle, which is how it keeps beating all day and night. Involuntary muscles in the stomach and intestines help us digest food. It receives oxygen-rich blood from the lungs and then empties the blood into the left ventricle through the mitral valve.

It pumps oxygen-rich blood out to the rest of the body. Blood leaves the left ventricle through the aortic valve and enters the aorta, the largest artery in the body. Blood then flows from the aorta into the branches of many smaller arteries, providing the body's organs and tissues with the oxygen and nutrients they need. The lungs are not used until a baby is born — the fetus gets oxygen directly from the mother's placenta. Because this is the exchange of gases between the atmosphere and the bloodstream, it is also called " external respiration ".

When freshly oxygenated blood reaches the capillaries of the tissues, oxygen moves from the blood toward the tissues, and carbon dioxide moves from the tissues toward the blood. This gas exchange that occur between the blood and the cells of the tissues and organs is called " internal respiration ".

Blood vessels have a muscle layer that is able to relax or contract. When we need to increase our blood pressure, the muscle layer contracts and makes the blood vessel diameter smaller.

This is called "vasoconstriction". When the muscle layer of a blood vessel relaxes, the blood vessel diameter becomes larger. This is called "vasodilation". Vasodilation lowers the blood pressure. Drugs that cause the diameter of the blood vessels to change are called vasoactive drugs. Drugs that make blood vessels constrict are used to treat low blood pressure and are called vasocontrictors. These bring blood to the lungs, where oxygen enters the bloodstream, and then to the body:.

The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. The pulmonary artery carries oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream.

An electrical system that stimulates contraction of the heart muscle. Search Encyclopedia. About the Heart and Blood Vessels The heart is the hardest working muscle in the human body. How the heart works The heart is a large, muscular organ that pumps blood filled with oxygen and nutrients through the blood vessels to the body tissues.

It's made up of: 4 chambers. Here is the process: The right atrium receives blood from the body. The left atrium receives blood from the lungs. Minus Related Pages. Normal Heart. Information For….

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