The Human Muscle System

There are over 650 muscles in the human muscle system in which contribute to complete physical activities such as running, walking, dancing, speaking, and even breathing. (Every day myst) Muscles are organized into three classifications skeletal, cardiac, and smooth.

Skeletal, smooth, and cardiac muscle are found in particular organs. The heart is the only organ that is composed of cardiac muscle. As the heart has a life time job in pumping the blood throughout the body. The vigorous muscle contains cell that appear to be striated. The interlocking cells allow the heart to contract and relax when pumping blood. The cardiac muscle is involuntary. In the walls of hollow organs such as the stomach, gallbladder, and colon smooth muscle is found.

In the anterior trunk, movement of the arm from the shoulder joint, movement of the scapula, movement of the abdominal wall, and muscles used for breathing. The deltoid muscle is a large, round shape, triangle that is located at the shoulder. With the assistance of this muscle we can complete daily tasks such as lifting your hands to the sides and to the front. The pectoralis major is a large muscle that is located in the anterior chest area between the arm and sternum. In a day to day life this muscle creates a vertical, rotational and lateral motion, as it is attached to the humerus. Beneath the pectoralis major you can find the pectoralis minor. Inferior to the pectoralis minor and lateral to the trunk you can find the serratus ventralis. Both muscles pectoralis minor serratus work together. As the muscles protracts, rotates and elevates the scapula. The muscle serratus ventralis is essential in horizontal arm movements, an example of this movement would be when a person pushes or punches. Inferior to the pectoralis major and lateral to the trunk you can find the serratus ventralis. The muscle rectus abdominus commonly known as the “6 pack” muscle found in between the inguinal ligament and the sternum. In a day to day the rectus abdominis compresses the abdomen and flexes vertebral column. (Allen and Harper 2014) A superficial muscle that is lateral to the rectus abdominis is the external oblique muscle. The