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16 Cards in this Set
- Front
- Back
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__% of your Skeleton is remodeled per year. What areas ? |
10%. Ex. Bones in our feet remodel more frequently than the bones in our skull. |
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After age __ we start to lose balance in osteoclasts and osteoblasts, causing us to lose bone density. |
35 |
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Calcium homeostasis refers to the amount of calcium in _____. |
Blood |
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Normal blood calcium is (___-___ mg/dL) |
9.2-10.4 |
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What three organ systems play a role in keeping the blood calcium near 9.2-10.4? |
Bone, Kidney, Digestive tract |
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99% of the bodies calcium is in your ____. |
Bones |
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What process would occur is our blood calcium was high, for example 11 mg/dL? |
We need to get rid of some calcium. Put the calcium into the bones (deposition). Osteoblasts would stimulate that process! All blood filters through our kidneys every 22 minutes! If our calcium level is too high, as it runs through the kidneys it will be pee’d out. If we eat food containing calcium, it will not be absorbed in the blood. The digestive tract will take its course, It will be lost in feces! |
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What process would occur is our blood calcium was low, for example 8.9 mg/dL? |
We need more calcium Our bones would perform resorption (using osteoclasts). This would deposit calcium from the bones into the blood stream. Calcium that was previously filtered in our kidneys will be reabsorbed into our blood stream. When you eat calcium in your food, the digestive tract will put calcium into our blood. (Another form of resorption) |
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How do our bones, kidneys, and digestive tract know when lose or gain calcium? |
Hormones |
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Calcitonin -Location, stimulus, function? -How? -clasts? +blasts? |
Stimulus- high calcium in blood Function- lowers blood calcium |
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PTH -Location? Stimulus? Function? - +clasts, -blasts, Kidney retains Ca (2+^) |
Stimulus- low blood calcium
function- raises blood calcium |
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Cacitriol (= vitamin D) Function? Stimulation? |
Raise blood calcium. Primarily via raising Ca++ absorption from small intestine/ decreases calcium loss in urine Stimulates +osteoclasts, bone resorption only when calcium is extremely low |
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What are those hormones a part of? |
Endocrine control of calcium homeostasis |
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PTH (parathyroid horomone) -Location? Stimulus? Function? - +clasts, -blasts, Kidney retains Ca (2+^) |
Function- raise blood calcium Stimulus- low blood calcium |
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Front (Term) |
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Front (Term) |
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