Question

what do you mean by circulation of blood?
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Answer 1

Answer:

blood circulation The circulation of blood refers to its continual flow from the heart, through branching arteries, to reach and traverse the microscopic vessels in all parts of the body, reconverging in the veins and returning to the heart, to flow thence through the lungs and back to the heart to start the circuit again. This uninterrupted movement of the blood is necessary to maintain the supply of oxygen from the lungs and nutrients from the gut, as well as for the distribution of hormones, many other chemicals, water, and heat, and the delivery of waste for excretion. The 5 litres of blood contained in the blood vessels of a typical adult at rest complete the circuit in about one minute: the blood recirculates 1500 times each day even without any exercise to speed it up.

The beginning of the modern concept of the circulation of blood is attributed in Western society to William Harvey, who, in a treatise published in 1628, Exercitatio anatomica de motu cordis et sanguinis, presented convincing evidence that blood flowed in arteries out from the heart to the tissues and returned back along veins. He did not know how blood passed from arteries to veins, as this was long before Malpighi of Bologna discovered the microscopic capillaries which connect them, but he deduced that some sort of channels must exist. Harvey based his radical conclusions on experiments on a wide range of animals and then demonstrated his results and explanations to his colleagues.

Explanation:

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Answer 2

Answer:

The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.The circulatory system (cardiovascular system) pumps blood from the heart to the lungs to get oxygen. The heart then sends oxygenated blood through arteries to the rest of the body. The veins carry oxygen-poor blood back to the heart to start the circulation process over.

Explanation:

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