Vitamin D and Calcium Levels

by Kevin Ahern, PhD

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    There are several considerations in regulating the body calcium levels. We’ve talked about the blood but there’s several things to consider. First of all, vitamin D in our diet. Are we getting enough calcium in our diet? And is our body making sufficient amounts of vitamin D to support the calcium that we need. The parathyroid hormone or the PTH that I talked about is active in the kidneys and the bone as we shall see. And this helps to either, in the case of PTH, to release calcium so that the body has enough calcium travelling to the blood stream or in the case of a protein called calcitonin to actually absorb that calcium back into the bone and reduce the blood levels of calcium. We’ll see that in just a second. So the bones as I said are important reservoirs of calcium. A place to put excess calcium when the body has excess calcium and a place to provide calcium when the calcium levels are too low. These two hormones, calcitonin and PTH, that I have described play important roles in that process. The bone making that is the taking of calcium out of the blood and putting it into the bone occurs in specialized bone cells called osteoclasts. This reduces blood calcium and stimulated by calcitonin. On the other, when the blood needs more calcium, bones are broken down in specialized cells called osteoclasts. These cells are stimulated by the hormone known as PTH. Now, another important variable in calcium levels in the blood is phosphate concentrations. Phosphate levels are increased by calcitonin. Calcitonin acts on the kidneys and it stimulates the process of phosphate reabsorption that is preventing the phosphate from being excreted in the urine. As a consequence phosphate concentration in the blood supply goes...

    About the Lecture

    The lecture Vitamin D and Calcium Levels by Kevin Ahern, PhD is from the course Vitamins.

    Included Quiz Questions

    1. All of the answers are true.
    2. None of the answers are true.
    3. Vitamin D controls uptake from the diet.
    4. Parathyroid hormone (PTH) and calcitonin regulate kidneys and bone.
    5. Bones serve as a reservoir of calcium.
    1. Calcitonin increases blood phosphate and reduces blood calcium.
    2. PTH stimulates bone making a reduction of blood calcium levels.
    3. PTH increases phosphate levels.
    4. All of the answers are true.
    5. None of the answers are true.

    Author of lecture Vitamin D and Calcium Levels

     Kevin Ahern, PhD

    Kevin Ahern, PhD

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