Question

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Answer 1

Answer:

Heart is the vital organ of the human body. Heart plays a major role in our body. The heart is responsible for major functions and transportation in our body repost it

Heart

The heart is an organ that pumps blood throughout the body. Human circulatory system is responsible for the transport of materials inside the human body. The organs of the circulatory system are heart, arteries, veins and capillaries. It comprises four chambers:

Answer 2

Step-by-step explanation:

In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system.