The Skeletal and Muscle systems. Tutorial ? Question
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When people lose too much bone density as they age-or never reach peak bone density o begin with-they can
develop a condition called osteoporosis. People with osteoporosis have what are called br tle bones and an
increased risk of fractures. Anyone can get osteoporosis, but the following groups are mos suscep ible:
• all women over age 50 (Women are four times more likely than men to develop osteoorosis.
• people with a small skeletal frame
Why do you think these groups have a high risk of osteoporosis?
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Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.

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