Human beings like other multicellular organisms need a regular supply of food , oxygen etc. This function is performed by a circulatory system. This system is responsible for transport of various substances in the human body.
Human Circulatory System :--
Blood & Lymph
Human Heart: --
It is a muscular organ, which is composed of cardiac muscles.
The human heart is composed of four chambers, -- right atrium, right ventricle, left ventricle and left atrium.
As both the oxygen and the carbon dioxide get transported by the blood. so, to avoid the oxygen-rich blood from mixing with the blood containing carbon dioxide, the heart has different chambers.
Blood vessels bring blood to the lungs, where oxygen enters the bloodstream, and then to the body.
Blood & Lymph:--
It is a tissue fluid which escapes from the blood capillaries into the intercellular spaces.
It is similar to blood plasma but colourless & contains less protein.
Lymph flows from the tissues to the heart assisting in transportation and destroying germs. Thus, it plays an important role in the immunity system.
Ans: a) Arteries carry oxygenated blood from the heart to the different body parts. Blood emerges from the heart under high pressure. In order to withstand this pressure, arteries have thick walls. b) Ve... read more
Ans: Lymph is a type of tissue fluid which escape from the blood capillaries into the intercellular space. It is colorless and contains small amount of protein and white blood cells that attack bacteri... read more
Ans: Veins are blood vessel which is also known as collecting vessel. veins carry deoxygenated blood from different body parts to the heart. most veins contains valves to prevent backflow, that is ensur... read more
Ans: Arteries are distributing vessels which carry oxygenated blood from heart to different parts of the body except Pulmonary artery. Since the blood emerges from the heart under high pressur. In or... read more