Locomotor System

 Injuries are an implicit risk in any activity. They can happen staying at home, while walking down the stairs and, of course, if you're doing any activity. To take notes about this topic is important to know the characteristics of each sport and then we must compare their injury indexes. Injury index:  It is an average number of injuries that happens, per one thousand hours of practice, in a particular activity. A rookie in sports like skating or boxing is likely to get injured until he masterize his technique. Also if you practice a contact sport such as footbal or rugby you are able to injure easily. Now, we must start with the ranking: Rugby: It has got a rate of 17 injuries per one thousand hours of practice. The contact added to the particularity of the footwear, makes contusions and ligament problems very common. Squash: Squash is the root cause of back injuries, heart problems (due to its high demand) and muscular problems. This is because it is played in avery small s...

 A dislocation is when a bone slips out of a joint. You can dislocate any joint of your body, for example, your knee, ankle, hip or shoulder. Dislocations almost always happen during traumas or sports injuries. If you suffer a dislocation you should never try to push a dislocated joint back to its place and you must receive medical attention as soon as posible. An untreated dislocation could cause damage to your ligaments, nerves, muscles or blood vessels. Dislocations typically result when a joint experiences an unexpected or unbalanced impact. This happens when the affected area suffers a harsh hit. When your joint dislocates, it is more likely to suffer another one. Types of dislocations: Complete dislocations (luxation):  It happens when the bones in your joint are totally separated and pushed out of place. Subluxation: It is a parcial dislocation. You have a subluxation if something pulls your joint apart and the bones still touch, just not as completely as usual. They ar...

 Muscles convert chemical energy into energy of motion. They use the chemical energy of the food we eat. We need this energy to enable growth and repair of tissues, to maintain body temperature and to fuel physical activity. The source of energy of our body is the ATP (adenosine triphosphate). Once the muscle contraction starts our body makes more ATP. There are three biochemical systems to produce ATP: using creatine phosphate (with oxygen): All of our muscles got a little bit of ATP but it only last for 3 seconds. So our body creates ATP breaking down creatine phosphate to create it quickly. 8-10 seconds. using glycogen (without oxygen): Fortunately, our body contains a carbohydrate called glycogen, so we can produce ATP from glucose. But it supplies the energy more slowly than from creatine phosphate. It lasts about 90 seconds, but we don't need oxygen, so our heart and lungs can increase the oxygen in our body. aerobic respiration (with oxygen): After two minutes of exercise, y...