Assignment 4 Essay examples

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The role of energy.
The role of energy in the body is extremely important as it is the power source which allows us to function. Without it we would not be able to carry out simple everyday activities such as communicating (talking) and moving. The role of energy also helps the body’s cells to repair themselves making them stronger and helps to reproduce making new cells for growth. It is needed in the body to allow blood to circulate around reaching the vital organs, to allow the human to be able to breathe and to be able to digest food.

The most common type of energy is chemical energy. The primary source of a human’s energy comes from food for chemical reaction. Energy comes from a person’s metabolism; the chemical reactions in the body's cells that convert the fuel from food into the energy this known as the metabolic rate which is affected by inheritance, body fat and exercise. There are two stages anabolism which builds up new cells and powers catabolism which breaks down old cells. Another type of energy in the body is sound energy and this is generated by the voice box in the throat. Another is electrical energy which is responsible for the nerve impulses and muscular contractions and finally light energy which originates from the sun and is then later stored as the original chemical energy that is packed and stored into food. Energy cannot be created or destroyed however only converted from one energy form to another energy form.
Within the human body there are a number of different systems which produce energy that allows our body to function. I am going to go into detail for two of them which are the digestive system and the cardio-vascular system.
The cardio-vascular system
The cardio vascular system consists of the heart (which is a muscular pump that pumps the blood around the body and transports carbon dioxide which is a waste product to the lungs and out of the body. It is also made up of blood vessels, arteries, arterioles, capillaries, venules and veins. The first stage of the cardiovascular system is when the human inhales the air through mouth and the nose where it then travels down to the human’s lungs through the blood stream. There are two primary circulatory loops in the human body which are the pulmonary circulation look and the systemic circulation loop. The pulmonary circulation transports deoxygenated blood from the right side of the heart to the lungs, where the blood picks up oxygen and returns to the left side of the heart. The pumping chambers of the heart that support the pulmonary circulation loop are the right atrium and right ventricle. The systemic circulation carries highly oxygenated blood from the left side of the heart to all of the tissues of the body (with the exception of the heart and lungs). Systemic circulation removes wastes from body tissues and returns deoxygenated blood to the right side of the heart. The left atrium and left ventricle of the heart are the pumping chambers for the systemic circulation loop. As well as oxygen and carbon dioxide being transported through the blood, it also transports such materials within hemoglobin and plasma. The red blood cell which is the one that transports oxygen contains the hemoglobin which absorbs the oxygen within the lungs and releases the oxygen to the rest of the body transporting energy. The body needs energy for exercise to take place. During and/or exercise it has an immediate effect on the individuals heart rate making the heart beat faster and faster creating more contact known as powerful stroke. The individual’s blood pressure is then a measure of the force that the heart uses to pump the blood around the body.

Digestive system
The digestive system is made up from a group of organs that are work together to convert food into energy and basic nutrients that can feed the entire body. The alimentary canal is made up of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. In addition to the
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