Why does the musuclar system respond to exercise?

Answer 1

Stimuli are received from the CNS by the dendrites and passed on via the axon. At the end of the axon is the axon terminal, which connects to the motor end plate of the muscles to form the neuromuscular junction. As there are so many muscles fibres it would take a lot of internal wiring to connect all off the stimulates between 15 and 2000 muscle fibres -- this is called a motor unit. The number of fibres in a motor unit depends on the type of work the muscle does. Once the motor unit is stimulated then all the muscle fibres in it will contract. This is known as the 'all or none' law. So once you start exercising (at steady state, running) all of your muscles will start contracting quite fast and start to go mad firing impulses. This will be caused by all of the impulses being sent to the brain from the muscles. But in our experiment we did we saw that the rate of the impulses slowed down about 3minutes and plateau out as well did the breathing rate and heart rate.

Answer 2

There are multiple responses, one is if lactic acid build up in the muscle's you will feel a burning pain, another is that when you exercise the muscles get micro tears and the body will register that as soreness or pain, and the body will heal and repair the tears and then it will add a little more muscle, it does this to compensate so that next time you lift that weight you can do it easier and with less effort. Also when you do any activity the neurons in the brain will develop more connections with other brain cells called "synapses", and when they do this the task becomes easier because your brain become accustomed to it and with some activities you will get to the point where you can do it without paying much attention.

Answer 3

The muscular system is torn slightly with strenuous exercise, especially with weight lifting. Once a muscle is torn through exercise, it recovers, and makes this muscle bigger, stronger and tougher. Therefore, all muscles are similar to calluses.

Answer 4

The body has evolved to respond to the demands that are placed upon it. Anything used heavily, such as a muscle, will grow, to be better able to do what it is being used to do, and anything not being used will tend to atrophy. This is a successful evoltionary design that makes organisms better able to survive.

Answer 5

Muscles become more pliable, allowing an increase amount the muscle can be stretched without tearing or causing other damage. It also increases the rate and speed of transmission from the central nervous system.

Answer 6

Muscle fibers break down and are torn during excercise. They repair and rebuild during rest