Organ System Essay

1300 Words 6 Pages
Falling at number eight on the thirteen steps of complexity are organ systems. These organ systems are extremely important in the makeup of organisms. Two very important organ systems are the muscular and nervous systems. Both have separate functions and organs and also have their own fair share of problems. The muscular system composes of the tissues and organs that are used to exert a force, whether under voluntary or involuntary control. Muscles are composed of long, slender cells called fibers, and these fibers come in bundles with very few or countless amounts per bundle. Muscles move by either contracting or extending, which is directed by nerve impulses sent from the central nervous system. There are three main types of muscles: smooth, …show more content…
Skeletal muscles are the muscles that are attached to the bones. These muscles are responsible for movement. Skeletal muscles have a striped fashion underneath a microscope. Working together by contracting or extending, skeletal muscles combine forces to create movements directed by nerve impulses. The two main types of skeletal muscles are flexors, which close joints, and extensors, which open joints. Most skeletal muscles are under voluntary control. Lastly is the cardiac type of muscle. This muscle, like the skeletal muscle, is striated in build. Due to the necessity and one’s own body’s lack of trust of one’s self, cardiac muscle is an involuntary muscle, regulated by parts of the nervous system. Cardiac muscle, the most important part of the cardiovascular system, is the muscle that is responsible for the heart contracting periodically in order to pump blood throughout the entire body. This is done for about one hundred thousand times a day, so the muscle has to be durable and strong. Most healthy hearts supply enough pressure to squirt blood out thirty feet. However some hearts are not as healthy due to poor diet and lack of exercise. In order to keep all of the muscles …show more content…
The nervous system holds the main organ in the body that is responsible for running and regulating the entire body; the brain. Along with all other parts of the nervous system, the brain coordinates all bodily functions. The nervous system is divided into two main parts: the central nervous system, the brain and spinal cord, and the peripheral nervous system, all extending nerves and sensory receptors. The central nervous system sends out impulses in response to stimuli and necessary functions at up to two hundred and eighty miles per hour. Nerves are made up of neurons are classified based on function: sensory, motor, and interneurons. Sensory neurons send messages based on their specific sense to the brain. Motor neurons control the contraction and extension of muscles, and interneurons are neurons that communicate with and relay messages between neurons. The central nervous is made up the brain, which is made up the cerebrum, the cerebellum, and the brain stem which then can be divided into the medulla oblongata, the pons, and the midbrain. The cerebrum is responsible for conscious thought, learning, and thought. Also, this part of the brain can be divided into two hemispheres, where the right hemisphere controls the left side of the body and the left hemisphere controls the right side of the body.

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