his chapter lays out the thyroid knowledge base necessary to understand the science and terms used throughout this book. A glossary is also provided at the end of the book to clarify technical terms as they arise.
THYROID ANATOMY AND PHYSIOLOGY
The thyroid gland is a roughly U-shaped organ at the front of the neck beneath the Adams apple. (Some people refer to their thyroids, but each of us has only one.) The gland has two lobes about two inches tall each, which rest vertically alongside the voice box and windpipe. The normal weight of an adults thyroid is about 20 grams (0.7 ounces).
Though small, the thyroid is the human bodys largest pure endocrine gland. A gland is any structure that secretes something within or outside the body. Glands can be endocrine or exocrine. Examples of exocrine glands include the liver, most of the pancreas, sweat and salivary glands, and the breasts. These organs secrete products by way of tubes called ducts onto the skin or into a body cavity, never into blood. Endocrine glands, on the other hand, secrete substances called hormones directly into the bloodstream. From head to foot, the major endocrine glands are the pituitary, the thyroid, the parathyroids, the adrenals, the pancreatic islet cells, and the gonads (testes in men, ovaries in women).
“Hey, you’ve got to see this. It’s about autism, and it’s in
Syracuse,” Mark said. A news anchor had announced the next story segment coming up on 20/20, ABC’s television news magazine.
I pushed back from the computer and rubbed my eyes as
I walked into the living room. Mark wasn’t sitting in the platform rocker. He was standing a few feet in front of the television set, his arms in front of his chest and holding his chin in his hands.
The program featured an education professor doing innovative, but controversial, work with children and young adults with autism. His clients couldn’t speak at all. Some of them barely had control over their arms and legs, let alone the dozens of tiny facial muscles that must be harnessed in order to speak. But when adults sat next to them and helped them keep their typing hands steady, they typed whatever they had to say.
They had smart, sophisticated ideas. Autism appeared to trap those ideas in their brains, an effect similar to cerebral palsy and other developmental disabilities that compromise muscle control.
In this chapter, we'll start using some of Bootstrap's most useful
HTML components. Components such as buttons, headers,
navigation menus, and comments system are commonly found on websites.
Through its components, Bootstrap helps us add such features to our sites
quickly and easily.
Page components form the basic structure of a web page. Examples of
page components include page headers, standout panels for displaying
important information, nested comments sections, image thumbnails, and
stacked lists of links. These are popular components that can take quite a
while to develop from scratch.
In this section, we'll focus on creating reusable HTML components
using Bootstrap-recommended markup and classes. Let's start with page
Giving a page a heading or title is not a big deal. Anyone can use
an <h1> tag to display a heading on a web page;
however, to neatly display a title with cleared browser default styles,
the proper amount of spacing around it, and a small subtitle beside it
can consume a surprising amount of time.
ceed on his journey, instead of staying at Colonel Scott’s a whole week, as he had first proposed to do. Reluctantly, and after much useless persuasion, the Colonel and his wife consented to his departure; and after breakfast his horse was saddled and brought to the door; and while “Pete” was busy adjusting his saddlebags, the poor victim of these merciless “Arkansaw jokes” attempted to offer something in the way of compensation for his entertainment, but, remembering what his Hempstead County friends had told him—that Colonel Scott would construe the offer of money into an insult and resent it as such—he was at a loss what to say. But, upon shaking hands with the Colonel and his wife and “Andy,” and bidding them good-bye, he ventured to say: “I do not know, my friends, how I shall ever be able to repay you for your kindness and—” “Oh, never mind,” said the Colonel, cutting him short,
“put it all in your book.” “Yes,” said Armstrong, “put it in your book, and if you ever come to White Oak Shoals, look up Andy