Describe the role of energy in the human body

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The role of energy in the body:

In our body we need energy to circulate blood, lymph and tissue fluid throughout the blood. It is also necessary for breathing and taking in oxygen, making new cells for carrying out grown and repair, to transmit nerve impulses so that we can respond to changes in the environment to build different complex molecules such as enzymes and hormones form the simple molecules produced after digestion of food.

Respiratory system is the process of breathing oxygen in and carbon dioxide out. This process is happened in our lungs. Anabolism is a building up of biochemical compounds or components and catabolism is the processes that break down molecules into smaller units and release energy.

C6 H12 O6 + 6O2 6CO2 + 6H2O + 36 ATP

Glucose + Oxygen Carbon dioxide + Water + Energy

Respiratory system

When we breathe air in from nasal passage and mouth it goes to the pharynx and then larynx which is also called a voice box because it contain the voice code. Epiglottis is open when we breath in and closed the larynx when eat food to prevent food and liquid from entering into the larynx. After the larynx it goes through trachea. Trachea has rings of cartilage which prevent it from collapsing. It is lined with layer of ciliated epithelium cells and goblet cells. Goblet cells produce large amount of mucus which helps to trap the dust and bacteria when we breathe in. Ciliated epithelium cells have many tiny hairs called cilia which beat together in a rhythm and move the mucus back up the trachea to the throat. After trachea it passed through the two bronchi. The bronchi branch into smaller bronchioles, which end in clusters of air sacs called alveoli. Alveoli are the place where gas exchange happen. It is round in shape and highly folded which gives a greater surface area leading to greater diffusion. (It is the movement of molecules of a gas or a liquid from a region of high concentration to a region of low concentration). The wall of alveoli is made of elastic fibres which allow expansion when we breathe in and recoil when we breathe out. It also contains the detergent- like substance called surfactant which lowers the surface tension and reduces the amount of effort needed to inflate the lungs. The alveoli are surrounded by capillaries and these capillaries carry blood containing carbon dioxide and when it gets in the alveoli the carbon dioxide diffuse from blood to alveoli and the oxygen diffuse from alveoli to blood. Alveoli are surrounded by narrow capillaries. The narrow path of capillaries slows down the blood flow and allows plenty of time for oxygen to pass through the arterial blood. Meanwhile, the waste-rich blood from the veins releases its carbon dioxide into the alveoli. The carbon dioxide follows the same path out of the lungs when we exhale.

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Diaphragm is sheet of muscles that lies across the bottom of the chest cavity and helps to pump the carbon dioxide out of the lungs and pull the oxygen into the lungs. The diaphragm contracts when the oxygen is pulled into the lungs and relaxes when the carbon dioxide is pumped out of the lungs.

The oxygen in now in the blood and we now need to get the blood to the cells this is the job of the circulatory system.

Circulatory system

Circulatory system actually happened in our heart and its function is to transport oxygen to all over ...

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