Structure and Functions of a Human Body

Topics: Cardiac muscle, Muscle, Reproductive system Pages: 5 (1910 words) Published: June 7, 2011
I enjoy researching and learning more about the muscular and reproductive systems it is interesting to learn how they actually work together in our body to help us perform daily tasks in life. I especially enjoy the muscular system, I am a physical fit person, I enjoy daily exercise and keeping myself healthy and in shape therefore learning more about the muscular system is very interesting. The reproductive system is another wonderful system to study and learn about, it is a great part of human life. I find it amazing to learn about the structure and functions of these two body parts and how they actually work together to perform homeostasis. We have so many muscles in our muscular system, too many to list. There are three main types of muscles. Cardiac muscles, skeletal muscles and smooth muscles, these particular muscle types are the main muscles of the muscular system and work together with other systems of the body to perform homeostasis. Muscles work together to provide the body with posture and other positions, they also have the ability to contract causing movements like walking and more subtle movements like smiling and breathing. The cardiac muscle is an involuntary muscle of the heart; it is composed of two sides and four chambers, the left and right atria and the left and right ventricles. The atria are located at the top of the heart and receive blood from various parts of the body. The ventricles are located at the bottom of the heart and pump blood away from the heart. The right ventricles pumps deoxygenated blood to the lungs. The left ventricle pumps oxygenated blood to the rest of the body. The cardiac muscles have the ability to work and not get tired out. The muscle is controlled by the lower part of the brain called the medulla oblongata and the main function is to propel blood in to circulation.

The smooth muscle is an involuntary muscle that provides force that moves your bones. Smooth muscles work together with your conscious effort. These muscle fibers are spindle shaped and can tense and relax; they are about twenty to five hundred micrometers in size. The structures are mechanically connected to one another so that one cell contracts to other adjoining. Smooth muscle contracts spontaneously by hormones or drugs and by mechanical stimulation such as a stretch. The skeletal muscle is the internal framework of the body, made of series of bones that provides force that move your bones. Muscles are connected to the bones by tendons and are responsible for the movements of the skeletal system. The muscle is attached closer to the trunk, the insertion is distal attachment. The contraction of a muscle is the result of the movement of a bone connected to each other at a flexible joint; the connected joints are brought closer together with the contraction of a muscle. If the bone is moved away when the muscle contracts it is called an extensor. There are two structures and functions of the reproductive system, the male and female functions. The female structures and functions are the uterus, fallopian tubes, cervix, ovary, and vagina. The uterus is connected to the vagina at the cervix. The uterus is shaped like an upside pear and has a lining and muscular walls it contains some of the strongest muscles in the female body, these muscles are able to expand and contact to hold a growing fetus and help push the baby out during labor. A normal uterus is about three inches. The fallopian tubes are located in the upper corners of the uterus and connect to the ovaries. The ovaries release eggs in to the fallopian. There are two fallopian tubes that attach to either side of the uterus, they are about 4 inches long and look about as wide as a piece of spaghetti, within each tube is a tiny passageway and at the end of the fallopian tube is an area that looks like a funnel. When an egg comes out of an ovary it travels down the fallopian tube, tiny hair help it push it down the narrow passageway toward the...
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