unit 5- Anatomy and physiology P4 M1 D1
Energy is the strength and ability that is required in order to perform physical or mental activities. There are different forms of energy these consist of: magnetic, kinetic, heat, light, gravitational, chemical, sound, electrical, elastic and nuclear.
The law, conservation of energy states that the total amount of energy within a system remains constant at all times, although energy within the system can be changed from one form to another. Energy cannot be created or destroyed, but it can be transformed. The law of conservation of energy states that when energy is being used, it’s not being used up instead it’s being transformed from …show more content…
Ventilation occurs when we inhale and exhale. When an individual inhales the intercostal muscles contract, expanding the ribcage. The diaphragm contracts and pulls downwards to increase the volume of the chest and the pressure inside the chest decreases and air is pushed into the lungs.
When we exhale the intercostal muscles relax, the ribcage drops downward and the diaphragm relaxes, moving upwards to decrease the volume of the chest. Finally the pressure inside the chest increases and air is pushed out of the lungs.
Materials such as oxygen, carbon dioxide and glucose enter and leave cells by diffusion. When a cell is respiring the concentration of oxygen and glucose inside the cell is lower than the surrounding blood so these substances move into the cell. As carbon dioxide is produced the concentration inside the cell increases to a level higher than the surrounding blood, so carbon dioxide diffuses out of the cell.
The cardiovascular system
The cardiovascular systems main function is to pump oxygenated blood and nutrients around