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Unit 19: Biology Part 2 Page 27 of 137
Textbook Reading
Lesson 1: Skin, Cells, Tissues, and Organs
Bones & Muscles There are many different types of
cells in the body, but all of them
Organization of the Body work to maintain homeostasis. For
example, there are specific muscle
Our cells are happiest when they cells for muscles, specific heart
are in their normal or “home” cells for the heart, specific
state. This is a state in which the pancreas cells for the pancreas,
temperature, the concentrations of and skin cell cells making up the
molecules, and molecules being skin. The different cell types differ
produced are all at the levels at in how they function. They all work
which they normally function. This together to make sure the body
“normal” or “home” state is called functions normally.
homeostasis.
A tissue is composed of specific
Our cells—and the tissues and cells performing the same function.
organs they constitute—work hard An organ is made up of two or
to maintain homeostasis. We can more types of tissues working
see this in action. When it is cold together. Organs which work
out and we shiver, that’s our body together form organ systems.
trying to get the temperature up to Organ systems work together to
normal levels. When it’s hot out maintain homeostasis.
and we sweat, that’s our body
trying to get the temperature down There are four main types of
to normal levels. We see our body tissue. Tissues are groups of cells
trying to maintain homeostasis which together form specific
when we feel hungry, or thirsty. functions. These types are:
Homeostasis is an important epithelial tissue, nervous
characteristic of living things. tissue, muscle tissue, and
connective tissue.
If you were in the desert, your
body would be working hard to Epithelial tissue is found in tightly
maintain homeostasis—despite the packed surface layers; such as the
high temperature and the lack of skin, as well as the lining of the
water.
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