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Let’s know about various circulatory system parts and functions in this section.

As learnt from above, it can be said that the circulatory system is the system that circulates blood and lymph (hemolymph in insects) throughout the body, consisting of the heart, blood vessels, lymph, blood, and the lymphatic vessels and glands.

Let’s know about various circulatory system parts and functions in this section. The circulatory system comprises three independent parts working together that includes the heart, lungs and arteries, veins, coronary and portal vessels. These can be referred to as cardiovascular and pulmonary systems for heart and lungs, respectively and systemic for the rest. The circulatory system is responsible for the flow of blood, oxygen, nutrients and other gases, and as well as hormones to and from cells.

The heart is a major organ responsible for pumping blood to all parts of the body. Therefore the heart and circulatory system, together termed cardiovascular system is a network for delivering blood, oxygen, hormones and nutrients to the body’s tissues. With each heartbeat, the function is performed where all the cells are enriched with oxygen, blood and nutrients. Normally, it beats between 60 to 100 times per minute. Blood takes entry to the heart through two large veins, the inferior and superior vena cava, and there it empties oxygen-poor blood from the body into the right atrium. When the ventricle contracts, blood leaves the heart through a valve called pulmonic valve into the pulmonary artery and to the lungs where it gets oxygenated. This process carries on in the body. (Image to be added soon)

A pair of spongy and elastic organs that help us in breathing are called lungs. The human chest cavity is occupied mainly with the lungs as they are located just behind to either side of the heart. They can be seen extending down from the collarbone to the diaphragm which is the muscular wall between the abdominal cavity and the chest cavity). In adults, the human lung’s length is 25 to 30 cm.or 10-12 inch. These are roughly cone shaped and the right lung is slightly larger than the left lung as it has three lobes and on the other hand, the left lung has only two. Lungs function in inhalation and exhalation or breathing, external respiration (exchange of gases between the lungs and bloodstream) and internal respiration (exchange of gases between the bloodstream and body tissues). The circulatory system of the lungs is also the portion of the cardiovascular system where oxygen-depleted blood is pumped away from the heart, via the pulmonary artery. It is taken to the lungs and then returned to the heart in the oxygenated form via the pulmonary vein.

The systemic circulation is responsible for the functional blood supply to all body tissues. It carries oxygen and nutrients to the cells and helps in removal of carbon dioxide and waste products. Systemic circulation carries oxygen rich blood from the left ventricle to the capillaries in the tissues of the body, through the arteries. It moves blood between the heart and the other parts of the body whereas pulmonary circulation is known to move blood between the heart and the lungs. Systemic circulation sends oxygenated blood to the cells as discussed above and also should be noted that it returns deoxygenated blood to the heart.

Blood is a fluid connective tissue that is highly important in the circulatory system. It is responsible for carrying oxygen and nutrients to all parts of the body. Blood is also helpful in regulating the temperature and acidic balance of the body.

The two types of blood circulation in humans are:

Here, a complex system of arteries and capillaries carry oxygenated blood from the heart to all parts of the body. Also, this system is responsible for carrying deoxygenated blood from the organs back to the heart via veins.

When the heart receives the oxygen poor blood from different parts of the body, it pumps those to the lungs for removing the carbon dioxide and other impurities and collects oxygen. Then, the blood is oxygenated, i.e. oxygen-rich and it is now sent back to the heart for systemic circulation.

The different three types of blood vessels in the human circulatory system are:

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