Friday, June 09, 2006

Mommy, what's my body?

Cara likes to ask me this question periodically. She started asking it when I was taking Human Anatomy. When i was taking Human Physiology she started asking "Mommy how does my body work?" I never told her the difference but she knew anyway. She is so smart. I am so often floored by how much she knows. sometimes i am convinced she is smarter than i am (honestly, sometimes its not too far of a stretch to think so). the human body completely fascinates me. i think it is the most beautiful of all God's creations. And after having studied it so intensely for a year i cannot imagine how someone can see anything other than perfect design. this is, of course, only my opinion and i am not debunking anyone else's thoughts on the origin of man. i suppose my studies have just confirmed more concretely for me the presence of a divine creator. i have decided that the design of the body is perfect in every way. it can heal itself, regenerate itself (just ask timm cash to see his fingers that he chopped the tips off of at can barely tell anything happened at all!), and maintain itself. Here's a for instance. In the summer time it gets too hot for the body to maintain proper life functions. So built into our bodies we have a thermoregulation feedback system (temperature regulation). we are set on or around 98.6 degrees. when the body gets warmerthan the set point, the brain sends a signal to the veins and arteries telling the deep ones to constrict and divert blood to the superficial ones so we can lose the excess heat. we also sweat. Because we sweat, we lose body water thus lowering our total body fluid volume which sets off another feedback system to compensate. When the body fluid volume feedback is working the kidney is stimulated by a certain horomone that tells it to reserve water. We also have a thirst center that is stimulated by another horomone so that we start to drink. I could go on forever just on feedback systems! If you are short on glucose in the body, for instance if you haven't eaten in a while, your body can just make it. The brain feeds off of glucose to function properly, so there are several ways in which glucose can be formed if it isn't ingested. Its freaking amazing. The reason your bone gets stronger the more you exercise is because when you put pressure on a bone it emits a small electric charge which in turn stimulate osteoblasts within the bone that strengthen and build bone. Freakin electricity in our bones! i often found myself to be speechless after many many lectures. Pretty neat stuff...

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