p.p1 because without it, the body would not function

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s2 {font: 7.3px ‘Century Gothic’; font-kerning: none} Importance of the circulatory systemThe circulatory system in multicellular organisms is important because without it, the body would not function properly without it. The heart is the most important organ out of the circulatory system because it transports oxygen and nutrients. It bring the oxygen from the digestive system and from the respiratory system. The oxygen that is made gets used when ATP is being created.

The nutrients (protein, fat, carbohydrate, vitamins and sugars) from the digestive system get diffused via the capillaries and getsWithout the heart and the circulatory system, oxygen would not get transported to the entire body. The body would stop working if oxygen is not circulated. The circulatory system also gets rid of waste chemicals such as lactic acids from the muscle cells by using veins as a way of transporting the waste away. The circulatory system also gets rid of any chemicals that would be of any harm.

For example, carbon dioxide gets transported to the lungs. Any other waste such as toxins would get sent to the liver, kidney and lungs so it can be gone from the body. The system also fights infections and provides a pathway for the white blood cells to engulf the infected cells (bacterial or viral) and break it apart.

The circulatory system sends signals if some part of the body get injured so cells can start to heal it.It keeps the body temperature in control. For example. when the body temperature drops, the body will try to save the body heat and there is more muscle activity (when you are shivering) going on which increases the body temperature so it stays stable. If the body temperature is increasing above 37oC then the nervous system will get signals so the sweat glands can release fluid to cool down the body. The cardiovascular system also transport signals from the endocrine gland so the hormone can function properly.

It controls the thyroid gland which is a hormone that  make sure that the cells in the body function normally.Importance of the respiratory systemThe respiratory system is important because it make sure that the body has enough energy to function and do activities. It is also important because the process is how get the energy from the food that has been digested. However, the main function of the respiratory system is to get rid of carbon dioxide (that was produced by metabolism) and to receive oxygen through inhalations so the body would function normally. If the oxygen gets depleted in the body, then the body will not function. A multi organism such as a mammal would inhale from a nose in which oxygen is collected from the air and the oxygen is passed on to the cardiovascular system. The respiratory system would not function if the cardiovascular system was not functioning.

When the oxygen gets passed on to the cardiovascular system, the red blood cells get transported to arteries which bring oxygen to different places in the body. The respiratory system is also linked to brain. If there is less oxygen going to the brain than normal, the neutrons will start to break down and any cellular activities will be halted. There is also a chance that the cells in the brain would die if oxygen is not reached to the cells.