Category Archives: HOW?
201.HOW DO WE TASTE OUR FOOD?
Taste depends on the impact of the atoms given off by a substance on certain specially sensitive organs in our bodies. If the atoms of a substance can’t move about freely, we can’t taste it. That’s why we can only taste things that are in a state of solution.
Animals that live in water have taste buds all over their bodies. For instance, fish can taste with their tail fins! Animals that live on land have their taste buds concentrated in their mouths, and in man they exist only on the tongue.
194.HOW DO OUR MUSCLES WORK?
In our bodies there are certain cells which make up connective tissue — tissue that joins the various parts of the body together. All the cells in connective tissue can contract, or tighten up. In some parts of the body, these cells can contract to a special degree, so they transform themselves into muscle.
At those points in the body where muscle cells are used frequently, they multiply and join together to form a single smooth muscle composed of many fibers.
193.HOW DO OUR JOINTS WORK?
If our bodies didn’t have joints, it would be impossible for us to live as we do. We would have to lie absolutely still always, unable to move our heads, walk, raise our arms, or move a single finger! Our ability to move is possible because of the existence of joints.
Wherever two bones glide over one another, a joint exists. A joint allows the bones to glide smoothly with very little friction. This is because the ends of the bones are covered by cartilage so that they don’t really rub against each other.
