Thames & Kosmos Kids First: Biology Lab (V 2.0) handleiding

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Animal Cells and “Guinea Pigs”

TYpES oF aNIMaL CELLS

Animal cells have very different shapes and

colors, depending on what task they take on

in the body. From the piece of meat, you

were able to examine two types of cells. The

colorless fat cells are large round or oval

shapes packed together in groups. They are

almost completely ﬁlled with a fat reservoir,

like a big bubble of oil inside the cell, and

are therefore pure energy stores.

It’s a completely different story with the

muscle cells from the meat. They are

striped, elongated structures that are hardly

recognizable as cells. When you raise your

arm, each one of these individual muscle

cells will shorten, an action that draws on

the energy stored in the fat reservoirs inside

the fat cells!

There are dozens of different types of

cells in our bodies, such as skin, bone,

blood, and nerve cells. Each one of these cell

types has its own special work to do, and

each looks different from the others!

Fat cells in the skin

Muscle ﬁbers

Do you remember the onion cells? When you viewed them with the microscope,

you could clearly see the protective cell walls. But you may not have noticed

any cell walls when you examined the cells from the oral mucosa and the meat.

Rightly so! Because like all animal cells, they have no cell wall at all.

In simple terms, one can say that animal cells do not need the cell wall because

a skeleton or armor takes over their protective function and gives the animal

its necessary stability. The cells of plants and animals also differ from one

another in other ways. Animal cells, for example, have no chloroplasts.

The Cell Wall

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