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Here's a little bit of physiology courtesy of kidshealth.org/teen/your_body/body_basics/heart.html:
The heart is the key organ in the circulatory system. As a hollow, muscular pump, its main function is to propel blood throughout the body. It usually beats from 60 to 100 times per minute, but can go much faster when it needs to. It beats about 100,000 times a day, more than 30 million times per year, and about 2.5 billion times in a 70-year lifetime.
The heart gets messages from the body that tell it when to pump more or less blood depending on a person's needs. When we're sleeping, it pumps just enough to provide for the lower amounts of oxygen needed by our bodies at rest. When we're exercising or frightened, the heart pumps faster to get more oxygen to our bodies.
The heart has four chambers that are enclosed by thick, muscular walls. It lies between the lungs and just to the left of the middle of the chest cavity. The bottom part of the heart is divided into two chambers called the right and left ventricles, which pump blood out of the heart. A wall called the interventricular septumdivides the ventricles.
The upper part of the heart is made up of the other two chambers of the heart, called the right and left atria(pronounced: ay-tree-uh). The right and left atria receive the blood entering the heart. A wall called the interatrial(pronounced: in-tur-ay-tree-ul)septum divides the atria, and they're separated from the ventricles by the atrioventricular (pronounced: ay-tree-oh-ven-trik-yoo-lur) valves. The tricuspid valve separates the right atrium from the right ventricle, and the mitral (pronounced: my-trul) valve separates the left atrium and the left ventricle.
Two other heart valves separate the ventricles and the large blood vessels that carry blood leaving the heart. These valves are called the pulmonic valve, which separates the right ventricle from the pulmonary artery leading to the lungs, and the aortic valve, which separates the left ventricle from the aorta, the body's largest blood vessel.
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What are the main organs for the respirtary system and circulatory systems?
The main organs of the respiratory system are the lungs. The main organs of the circulatory system are the heart and blood vessels.
Organs in the respiratory and circulatory system?
The main organs of the respiratory system are the lungs. The main organs of the circulatory system are the heart, blood, and blood vessels.
Are the main organs of the circulatory system the heart and lungs?
The heart and blood vessels are the main organs of the circulatory system. The lungs are part of the respiratory system.
What are the main organs of your circulatory system?
heart
What the main organs circulatory system?
heart and lung
What are other main organs for the circulatory system?
The main organs of the circulatory system are the heart, blood vessels and blood. The blood vessels include arteries, veins, and capillaries.
What are the organ of circulatory system?
main organs of the circulatory system are the heart and veins. their purpose is to circulate blood in the body.
What are the major organs of the circulatory systems?
The main organs in the circulatory system are blood,heart(main organ), blood vessels(arteries/veins),and lungs hope this helps:)
What are two main organs in the circulatory system?
The heart and the blood vessels
What do you think is the main functions of the circulatory system?
The main function of the circulatory system is to carry oxygen, nutrients and wastes to and from the body tissues. Its main organs are the heart and blood vessels.
What does the main organ of the circulatory system do?
The main organ of the circulatory system is the heart, and it pumps blood to the cells of organs and tissues, giving them oxegyn and removing carbon dioxide.
Three organs of the circulatory system?
The organs of the circulatory system include the heart, lungs, kidney, liver, and small intestines. The blood and blood vessels also play a large part in the proper function of the circulatory system.
