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The Muscular system contains more than 650 individual muscles anchored to the skeleton. The most powerful muscle is the Gluteus Maximus; it makes up your bottom. The longest muscle is the Sartorius; it runs from the hip to the knee. The largest muscle in area is the Latissimus Does; it is located in your back. Muscles are attached to your bones by tendons. Your muscles don't work alone; they work in groups.
With groups of two, you have an extensor and a flexor. An extensor is a muscle that's allows a joint to straighten. And a flexor is a muscle that causes a joint to bend. You have two types of muscles, voluntary and involuntary. Voluntary muscles work only when you want them to work. Like your arms, you move them using your brain.
Involuntary muscles work all by their self, like the heart. Muscle exerts force by converting chemical energy into tension and contraction. Muscles move and make us capable of a variety of actions by simply contracting and becoming shorter. Muscles pull but they cannot push. Muscles are made up of millions of tiny protein filaments, which work together to produce motion in the body. Each of more than 600 muscles is served by nerves, which link the muscle to the brain and spinal cord.
Our bodily needs demand that muscles accomplish different chores, so we are equipped with three types of muscles. Cardiac muscles, found only in the heart, power the action that pumps blood throughout the body. "Smooth" muscles surround or are part of the internal organs. Both cardiac and smooth muscles are called involuntary muscles, because they cannot be consciously controlled. The third types of muscles are called "skeletal" muscles.
These carry out voluntary movements and are what ache after strenuous exercise. Skeletal muscles are the body's most abundant tissue, comprising about 23 % of a woman's body weight and about 40 % of a man's body weight. There are a variety of muscles that interact in the movement of the body. These muscles range from muscles of facial expression to muscles that help the ankle, foot, and toes move. Some of the muscles located in the head include the following: the epicranius, which helps raise the eyebrows; the buccinator, which compresses the cheeks inward; the platysma, which allows the mouth to open downward; the masseter, helps close the jaw; and the splenius capitis, which rotates the head, bends the head to one side, and brings the head to an upright position. However, as we all know the head is not the most important part of the body.
The muscles that interact together to help one's upper body to function range from the trapezius, to the deltoid, to the extensor carpi ulnaris. The trapezius, which is located in the pectoral girdle along with the rhomboids major, the levator scapulae, serratus anterior, and the pectoralis minor, helps rotate the scapula and flexes the arm. It also raises and lowers the scapula and shoulder. The deltoid is a member of the upper arm family. Such muscles as the pectoralis major and the teres major and minor surround the deltoid. Its main action is to abduct the upper arm, then extend the humorous or flex it.
The extensor carp ulna is, which is located in the base of the fifth metacarpal, allows the wrist to extend and retract. Finally, the muscles that can be considered to be the strongest in the body, those of the lower body, since, these muscles receive the most strenuous work of any muscles, interact to insure that a person's everyday exercises are not affected. The psoas major, gluteus maximus and medius, biceps femoris, rectus femoris, gastrocnemius, and the soleus are just some of the muscles that work as a team to help the lower "half" going. The functions of these muscles range from flexing the thigh (the psoas major), to flexing and rotating the leg laterally and extend the thigh (the biceps femoris), to plantar flexion of the foot and flexion of the leg at the knee (the gastrocnemius and the soleus). Once these aforementioned muscles and its "teammates" work together properly, the human body is ready to function.
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Research essay sample on Skeletal Muscles Smooth Muscles
