The function of the circulatory system is to provide oxygen and food to each and every cell of the body and absorb carbon dioxide and other wastes from each and every cell of the body.

The function of the circulatory system is to provide oxygen to each and every cell of the body and absorb carbon dioxide from each and every cell of the body.

Circulatory system carries oxygen and food to supply to the cell and on its return journey to the heart, it is carrying carbon dioxide and other wastes from different cells of the body.

Circulatory system carries oxygen, food, carbon dioxide and other wastes.

The circulatory system absorbs the digestive food/nutrients from the small intestines and transports and distributes them to all parts of the body. It does so by a fine network of blood vessels in the small intestines. Nutrient rich food is absorbed in these vessels by the process of diffusion and distributed across the body by the many blood vessels of the circulatory system.

The circulatory system absorbs the digestive food/nutrients from the small intestines and transports and distributes them to all parts of the body.

X-ray imaging is useful for studying bone structures. X-rays can not be used for studying tissue of muscle structures and therefore angiogramy is used. In this process, fluorescent dyes are injected in the artery and then X-rays are used to examine the tissue/vessel containing the dye.

Figure 7a shows the cross section of an artery. This is indicated by the thick muscular walls of the vessel. These thick walls are there to endure the high pressure of the blood passing through them to be supplied to all parts of the body.

Figure 7b shows the cross section of a capillary. This is indicated by the its small cross section which is just wide enough to allow the passage of one red blood cell at a moment. The small diameter of these vessels ensures that each body part is supplied with oxygen rich blood independent of its location. Every body part because of its location, is not accessible by the artery and therefore capillaries are required to reach out to such areas of the body and provide them with nutrients and oxygen and collect from them carbon dioxide and other waste products.

Figure 7c shows the cross section of a vein. This is indicated by its thin wall. This thin walls are sufficient to carry low pressure blood back to the heart.

Click to see answers.

Heart; the main pumping organ of the circulatory system is made up of cardiac muscle tissues, nerve tissues and connective tissues.

Blood; the fluid transported around the body by being pumped by the heart is composed of red blood cells, white blood cells, plasma and platelets.

Blood vessels form a detailed network through the body. It is the route taken by the blood pumped by the heart to reach every corner inside the body. This network is composed of arteries which carry oxygen rich blood away from the heart. These arteries branch away to fine capillaries to enrich each body part with oxygen and nutrients and collect from them wastes and carbon dioxide. This deoxygenated blood is drained into the veins which bring this blood back to the heart.

Click to see answers.

a. Pie chart: (Red region = red blood cells, Yellow region = plasma, burgundy region = platelets and gray region = white blood cells)

The purpose of the heart is to pump blood at high pressure so that it is able to reach all parts of the body. For this the cardiac muscles are thick and strong and they are specialized to contract (and relax) at the same time. This simultaneous contraction allows the heart to be able to build up the pressure required to supply blood to all parts of the body. The digestive tract is not designed to do any sort of work that the heart does and therefore its muscles are made differently. They can contract and relax as required to move the food around the tract.

The heart is an organ that is working at all times and must therefore be regularly provided with nutrients and oxygen to keep it energized. Coronary arteries around the heart are responsible for providing nutrients and oxygen to it. Some times with age, or with long intake of high cholesterol and fatty diet, these arteries can become partially block by the deposition of the fats in the food. In such case the supply of nutrients reaching the heart reduces and the heart is deprived of its nutrients and oxygen and fails to function properly leading to symptoms of fatigue, dizziness and heart burn.

Permanent blockage of coronary arteries leads to heart attack. The heart is deprived of its nutrients and oxygen completely and therefore stops functioning. This condition can even lead to death if not addressed immediately.

Click to see answers.