Human Body Essay

Essay about The Human Body: The Muscular System

543 Words3 Pages

The human body is composed of many different systems working cooperatively. Unlike other body systems, there are some that are essential for circulation, locomotion and posture; the muscular system being one of those. Muscles, the main constituents of this system, are organs that serve in converting chemical signals into mechanical forces which permit the movement of the body (Campbell, 2012). The basic units of this system are muscular cells. This type of cells originates from the mesoderm where the development results in a buildup of myofilaments in the cytoplasm and the formation of specialized parts and channels. A type of muscles in the iris, which is an exception, originates from the ectoderm (Paulsen, 2010).
There are several…show more content…

The human body is composed of many different systems working cooperatively. Unlike other body systems, there are some that are essential for circulation, locomotion and posture; the muscular system being one of those. Muscles, the main constituents of this system, are organs that serve in converting chemical signals into mechanical forces which permit the movement of the body (Campbell, 2012). The basic units of this system are muscular cells. This type of cells originates from the mesoderm where the development results in a buildup of myofilaments in the cytoplasm and the formation of specialized parts and channels. A type of muscles in the iris, which is an exception, originates from the ectoderm (Paulsen, 2010).
There are several types of muscles that serve unique functions and are distributed in different parts of the body. The three main types of muscles that differ in morphology and function are skeletal, cardiac, and smooth muscles.
Skeletal Muscles
Skeletal muscles make up a big percentage of muscle mass in the human body ranging from 36 percent to 42 percent depending on the gender of the person. With their attachment to the skeleton, these muscles have the ability to produce contractions and to move muscle components over large spans. The contractions are voluntarily controlled by motor neurons originating from the spinal cord and by specific neurotransmitters; mainly the neurotransmitter acetylcholine (Campbell, 2012). The bundles of

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Human Body Essay

The Human Body Your body is a wonderful thing. It has many systems, organs, cells etc... Each part controls a different part of your body and how it functions. I am going to tell you about all of the systems.

The PNS includes the nerves that connect the CNS to all parts of your body. It carries messages to and from the CNS. All parts of the nervous system are made up of special nerve cells called neurons. Neurons cannot replace themselves like the other cells. Once they've been destroyed, they can't replace themselves.

There are many systems one of them is the nervous system. The nervous system is the group of body parts that makes and sends the commands that control all your actions. There are many different parts of the nervous system. Like the central nervous system (CNS). The CNS includes the brain and the spinal cord. It is the bodies main control center. There is also the peripheral nervous center (PNS). Another system is the respiratory system.

The respiratory system is the group of body parts that changes gases in order for the body to work properly. The respiratory system has two sections. The upper sections include your nose, mouth and windpipe. The lower section includes the lungs and two structures within the lungs the bronchi and the alveoli. The two lungs are the main organs of breathing. Lungs are elastic bodies one on each side of the heart. They are filled with millions of tiny air sacs called alveoli. The alveoli are at the end of the bronchi. The diaphragm is an important part to breathing. The diaphragm is a large muscle that separates the chest from the abdomen.

Another system is the skeletal system. The skeletal system is all...

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