Much of the human body doesn’t depend upon conscious thought; we are dependent upon our Master Designer.
11 Death and Destruction lie open before the LORD–how much more do human hearts!
We don’t know it, but even as we have this moment in time, our bodies are maintaining themselves without any conscious thought on our part. Take, for instance, our bones. What are they doing right now? From, “A Pocket Guide to the Human Body, page 54-56
Bones stop growing in length when we reach adulthood. But for the rest of our lives bones must continue to be maintained and change shape, repairing damage and responding to changing demands, such as shifting weight during pregnancy. So God designed a mechanism that allows bone to be both formed and removed where necessary. The cells that make bone are called osteoblasts (which means “bone maker”), and those that remove bone are called osteoclasts (which means “bone breaker”).
Osteoblasts don’t make the crystal part of bone (hydroxylapatite) directly. They first secrete bone matrix, which initially consists entirely of organic material, including the fibrous protein collagen. Bone matrix attracts minerals, such as calcium and phosphorus, which are in our body fluids. Over time, the minerals accumulate to form the crystal hydroxylapatite [which turns to bone].
Osteoclasts are relatively large cells with many nuclei that remove both the mineral and organic components of bone. They secrete an acid that dissolves the mineral of bone, and enzymes that break down the organic components of bone, including collagen.
During the growth phase of our life, osteoblasts make bone faster than the osteoclasts remove it. When growth is completed, God designed the osteoblasts and osteoclasts to work in harmony, constantly replacing bone without growth.
As we get older, osteoclasts may remove bone faster than osteoblasts make it, resulting in a reduction of bone density known as osteoporosis…bone density increases in response to load from weight or exercise…so exercise makes good sense to potentially reduce the effects of osteoporosis…
As we come to the end of our study of bones, it’s pretty obvious that evolution didn’t construct our skeletal system. There is too much irreducible complexity going on. Speaking of which, we will discover the same “problem” as we look at our skin, beginning tomorrow.
Abba, our human bodies are amazing. To think that they were perfect at one time, compared to all of the disease and cancer in our world, makes me rethink the consequences of sin in and on my life. “For every action, there is an equal and opposite reaction” is true for our bodies. When we sin to “live,” it actually harms us in some way, and ultimately, it destroys us. It’s not Your design, nor is it Your will (desire) for us to be destroyed by sin. You love us and want the best for us as long as we are here on this earth. But, You will provide us with new bodies in Your kingdom. They will be like Yours, Jesus. In the meantime, make us like You on the inside. May it be our highest priority. Amen.