3 (a) Movement

Muscles named Flexor and Extensors works in opposite to each other, causing contraction of some and lengthening of other muscles.  There are 2 types of movement voluntary and involuntary.  Voluntary  movement is movement that you can control. Some examples are moving, talking and sitting. Involuntary movement is actions that you cannot control some examples are reflexes and breathing.  Movement can be changed based on our experience. For example if you do a phisical task more than once you are likily to get better at that task.   Our brain can fine tune movement.  To fine tune our movement our brain uses the sensitivity of muscle spindles also know as Gamma motor neurons.  Another group of motor neurons is known as the Golgi tendon organs detects the force created by contracting muscles and it signals the brain how much force is being applied.  3 parts of the brain help in movement. The motor corex controls alpha motor neurons. It can control many motions and it regulates sepcific musucle functions.  The cerbullum is the 2nd part of the brain that works with movement.  It receives information from head, limbs and cerebral cortex.   The last part of the brain is the basal ganglia.  The basal ganglia controls movemet errors and helps releses dopamine a neurotransimeter that helps with controling movement.