Category Archives: WHAT?
171.WHAT IS A HORMONE?
Hormones are secreted by the endocrine glands. Endocrine means “the internal secretion of a gland.” Another name for them is ductless glands, because they don’t send their secretions into ducts but directly into the bloodstream. Hormones are also produced by some organs such as the liver and the kidney, but most of the hormones in the body come from glands.
170.WHAT DO WHITE BLOOD CELLS DO?
You can see that blood, so necessary for life, is not a simple thing. Many different substances have their special work and importance.
Although the red cells are by far more numerous in the blood and give blood its color, the white blood cells have a critical role, too. The white blood cells are called leukocytes.
163.WHAT IS A SQUID?
In the days when Columbus sailed the seas there were stories told of long-armed monsters that reached out of the water to scuttle ships and pull the sailors down to the depths of the ocean. Such stories were exaggerations. There never were such monsters, and what the sailors probably saw were giant octopuses or giant squid.
