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Which one of the following statements is correct about the human circulatory system?

  By GK Planet Team      
Q. Which one of the following statements is correct about the human circulatory system?
  1. Blood transports only oxygen and not carbon dioxide.
  2. Human heart has five chambers.
  3. Valves ensure that the blood does not flow backwards.
  4. Both oxygen-rich and oxygen-deficient blood gets mixed in the heart.
Answer: Valves ensure that the blood does not flow backwards.

Circulatory system

The circulatory system (also called the cardiovascular system) is the body system that moves blood around the body. It consists of the heart and blood vessels.

Blood vessels that take blood away from the heart are arteries. Arteries divide into smaller arteries as they go away from the heart. The smaller arteries that connect to the capillaries are called arterioles.

So blood moves heart→artery→arteriole→capillary→venule→vein→heart. This is called circulation. There are two different circulations in the circulatory system. The systemic circulation is how blood goes to most of the body. The pulmonary circulation is how blood goes through the lungs. (Pulmonary means ¨about the lungs¨). This is how it works in mammals, including humans. Circulatory systems of other vertebrates differ somewhat.

The heart pumps oxygenated blood to the body and deoxygenated blood to the lungs. In the human heart there is one atrium and one ventricle for each circulation, and with both a systemic and a pulmonary circulation there are four chambers in total: left atrium, left ventricle, right atrium and right ventricle.

A heart valve is a one-way valve that normally allows blood to flow in only one direction through the heart. The four valves are commonly represented in a mammalian heart that determines the pathway of blood flow through the heart. A heart valve opens or closes incumbent on differential blood pressure on each side.
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