The Importance Of Humans

Humans are terrestrial but they don 't usually live wild in nature ,they make their own environment adapted to their needs, however humans have to live in a place where they can get consistent food supplies such as cow, pigs, chickens and plants. Oxygen and water is essential for human. Humans control their own competitors, predators, parasites, and diseases,humans require large and continual subsidies of energy, food, and other resources. These are needed in order to maintain the colonization of difficult environments and to continue the control of constraining ecological influences. Humans are naturally diurnal.

Humans need oxygen to create energy, all our cells have mitochondria which they create energy for our bodies in the form of …show more content…
The trachea splits into two smaller tubes called bronchi, each divides again from a tree branches shape called bronchioles. Theses bronchioles lead directly into the lungs and connect to the alveoli ( tiny air sac that allow gas exchange of oxygen and carbon dioxide takes place.) Because the lungs have no skeletal muscles of their own, so the work of breathing is done by the diaphragm, the diaphragm helps to pump the carbon dioxide out of the lungs and pull the oxygen into lungs. They are two very important adaptations in human gas exchange system that allows the human to survive successfully in their living environment. The first and most important part of gas exchange is the alveoli, alveoli are tiny membrane sacs that allow gas exchange of oxygen and carbon dioxide takes place. Alveoli have very thin permeable cell walls that are only one cell thick. Once the oxygen reaches the alveoli, it then diffuses through a single cell in …show more content…
The process of human internal circulation system begins by the capillaries, a site carries blood between arteries and veins. The capillaries carry the wastes and carbon dioxide through the deoxygenated blood to the venues, the venues branch into bigger vessels called veins, then the blood enters the right atrium through the superior vena cava and the inferior vena cava. After that the right ventricle contracts forces the blood into the pulmonary artery. The pulmonary artery carries the blood that is low in oxygen to the lungs where it becomes oxygenated. The oxygenated enters the left atrium through pulmonary veins, once the blood is in the left ventricle, the left ventricle contracts to pump the blood into aorta and then the aorta beaches into other arteries which then branch into arterioles. The arterioles meet up with capillaries which the oxygen and nutrients can be delivered to every cells in our body. All our cells have mitochondria which they requires oxygen to create energy for our growth, movement and brain function in the form of ATP. The capillaries in the lungs are the sites of chemical exchange from the blood through capillary walls and into body cells. It has many tiny vessels which reduces the pressure coming from the arteries and it 's only one cell thick so the molecules can