How is posture maintained with the muscular system?
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The muscles have a certain muscle tone (partial contraction) which keeps the body upright instead of limp. This is all your muscles, not just in your back. However, your back does have the long muscles running down your spinal chord (the name escapes me currently which makes me sad). Also, your leg muscles will partially contract to keep your legs upright.\n\nUnless you're dead, medicated, or paralyzed - your muscles will always have a partial contraction (aka tone).
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Flexibility, balance, agility, and force
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Strengthening your core (stomach and back) will help with your posture...most people don't realize stomach muscles influence a person's posture
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muscular system helps you move.....with out that you couldnt move anywhere......respiratory helps you breath.......circulatory helps the blood move through the body and other fluids get where they are going
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it just really depends on how stretched your skin is beforehand.  Some cheats, though.....do exercises that work your lower back and 'love handles'.  This will help with posture and help with appearence of a not-tucked-tummy.  Anything to stregthen your mid section.  Also, vitamin E can help tone your skin so it isn't so loose.
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Posture is important.  Don't be slumped over and lazy.  Look as if you could live without him.  Be confident in yourself and it will shine through.
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Stand up and stretch your arms above your head! The American Chiropractic Association (ACA) suggests, "Do the 'hug your best friend.' Wrap your arms around your body and turn as far as you can to the left, then to the right." \nExercise regularly to keep the abdominal muscles strong to help support the spine. \nAvoid wearing high–heeled shoes. Choose shoes that offer good foot support and comfort. Some styles can affect the body's center of gravity. Flat shoes are better. \nLook at yourself in the mirror. Is your posture good? Think about your posture and how to maintain it throughout the days' activities. Practice makes perfect!
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Muscle is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. Its function is to produce force and cause motion, either locomotion or movement within internal organs. Much of muscle contraction occurs without conscious thought and is necessary for survival, like the contraction of the heart or peristalsis, which pushes food through the digestive system. Voluntary muscle contraction is used to move the body and can be finely controlled, such as movements of the finger or gross movements like the quadriceps muscle of the thigh.\n\nthe masseter or jaw muscle is the strongest human muscle
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Skeletal Muscles, the muscles that moves your limbs, eyelids, lift your face, external sphincters of your anus and urinary bladder...\n\nHeart Muscles (Cardiac Ms) - these are also made of striated tissues
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shoulder lean and get up
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A system of balanced levers allows the user to adjust their posture in such a chair.\nTry the manufacturers of such chairs for more technical details\nGood luck!
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No growing medicines,\n\nMake sure you have correct posture.  Correct posture can give the appearance of a taller person. In some cases, if you slouch, you can add an inch or two by standing straight.\n\nCorrect posture will also prevent you from losing hieght as you age.
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Muscular System\n\nMuscle tissue can be organized into separate muscles that are considered individual organs. Together, they form the muscular system.The cells in a muscle have two major duties: movement and heat production. Although the joints of the skeletal system allow movement, they cannot make the movement themselves. For this they require the contraction of striated muscle. Movement inside the body cavity is provided by muscles made up of smooth muscle cells. For example, the movement of food through the digestive tract is provided by the smooth muscles in the esophagus, stomach, and intestines. Urine is moved through the urinary system by smooth muscles in the ureters, bladder, and urethra. Air is moved in and out of the lungs by smooth muscle in the diaphragm. The muscular system also serves as the major heat generator for the body, keeping tissues warm.\n\nMuscle is made almost entirely of protein. When protein intake through food is low or when food protein is not digested or absorbed properly, it must come from some other source. That source is the muscle tissue. Even when enough protein is provided by the diet, cancer cells will raid the muscles for protein to change into glucose. When muscle tissue decreases, the individual muscle is less able to perform its job, causing weakness in movement and the sensation of coldness due to loss of heat production. Although cancer of the muscular system is very rare, cancer in general can cause a serious loss of muscle tissue.\n\nEndocrine System\nThe endocrine system includes the pituitary and pineal glands; the hypothalamus, thyroid, and adrenal glands; the pancreas; and the testes or ovaries and placenta. These glands release their hormones into the bloodstream directly, as opposed to the exocrine glands, which release their products into ducts. The cell citizens of an endocrine gland are writers. They compose messages called hormones, which are distributed primarily through the bloodstream. Glands perform the same job as the nervous system: communication, integration, and control of bodily functions. The signals travel slower but are much longer lasting. Hormones are the main regulators of metabolism, growth and development, and reproduction.\n\nEndocrine cell tumors are called carcinoids. Cancers of the endocrine system include the following:\n\nGerm cell cancers—These include testicular cancer (male), gestational trophoblasic neoplasms (placental), and ovarian cancer (female). Pancreatic cancer—Over 90 percent of the carcinomas of the pancreas are mucinous adenocarcinomas that originate in the pancreatic duct. Thyroid cancer. Because they stimulate abnormal hormone production, cancers of the endocrine system are often able to produce symptoms in distant sites.\n\nHope this helps, good luck.
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Moves your skeleton apparently. It's job is to move your skeleton. The bones help structure this body so it can sustain movement.
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your  muscles contract and relax everytime you move. when you flex you are intentionally doing it.
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Cardiovascular, Muscular Endurance, Muscular strength, flexibility, and Body Composition.
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Once those muscles get tense - from sitting at a computer all day, from sleeping in an awkward position, etc. - they stay tense and need to be "released" by stretching or a massage.  We should all stretch, at least in a small way, several times a day to keep our muscles loose.  Once they get tense, it's easier for them to get tenser.  Try getting a massage, finding some good stretches, yoga, and using heating pads or taking hot baths.  Also, be sure to drink lots of water, as water helps remove the toxins in your muscles and the rest of your body that make you feel yucky, sore, and tense.