Muscular System

                The Muscular system is the one that is responsible for the movement of our body. The functions of the muscular system are:

• ·         Movement of the body
• ·         Maintenance of Posture
• ·         Respiration
• ·         Production of body heat
• ·         Communication
• ·         Constriction of organs and vessels
• ·         Contraction of the heart

There are three types of muscles, these are the skeletal, cardiac and smooth muscles. Skeletal muscles are the muscles that are attached to the skeletal system. Cardiac muscles are located in our heart. Smooth muscles are located in walls or hollow organs, blood vessels and glands.

The activity that we have done is determining the time of the muscle fatigue in Isometric Contractions and Isotonic Contractions. In the Isometric Contractions we first put the book in one arm and recorded the time of the muscle fatigue. We also repeat it in the other arm and both arms. We also done it using 2 books for the left arm, right arm and both arms. The result is that the time of the onset of fatigue is longer when we put 1 or 2 books in our both arms.

In the Isotonic Contractions, we stroll, brick walking and running for five minutes and rate the sensation of muscle fatigue in each activity. We repeat it again, this time doing the exercise up and down a staircase. The most painful is running in the staircase up and down for five minutes.