|Are cells a big part of our bodys?
|Question Date: 2009-05-21|
Yes cells are a big part of our bodies in two
ways, first because most of our body weight is
made of cells. About 60% of our body weight is
water and about two thirds of that is inside
cells. A lot of the rest of the weight is
Second, because cells are what makes
or organizes most of the rest of our weight.
Cells break down some molecules and build up other
ones, including protiens, fats, sugars, and DNA.
Cells make proteins and other things that do
their jobs outside the cells. Hair and
fingernails are made of a protein called keratin.
Collagen is another protein made by cells. It is
part of our skin. Cells also pump salts around,
which moves water.
Many things in our
bodies are combinations of cells, cell products,
and water. Something like blood contains a lot of
water, along with red blood cells for carrying
oxygen, white cells for fighting disease, and
platelets, which ar pieces of cells and help the
blood clot. There are also lots of protiens,
sugars, and various other fuels, wastes, and
signals. Bones are made of minerals, proteins,
water, and live cells that constantly make and
break down the bone.
Cells are also small
parts of our bodies. We're made of trillions of
cells. (A trillion is a 1 with 12 zeros.) Each
one is tiny, but together, they can build the
largest animal that has ever lived, the blue
Anything that has ever lived has
been made of cells. Some things are only one cell
big. Which do you think came first, things made
of one cell, or multicellular things? What's the
advantage of having many different specialized
cells instead of one cell?
There's a nice
site on cells at:
Cells are the fundamental units of life on our
planet. All organisms, including cells, are
composed of cells. Cells contain water and many
other large and small molecules - in fact, about
10,000 different types of molecules are in each
cell (on average). A human body has about 60
TRILLION cells! When you think about it, it is
pretty amazing - all those cells came from just a
single cell - a fertilized egg! And when you look
at the different types of cells in a human body,
not only do you deal with that very large number,
but there are many TYPES of cells- your blood
cells, neurons, heart, muscle, etc... You have
probably heard it said that our bodies are "mostly
water." that is true, but that water is contained
primarily within those 60 trillion cells. Another
very interesting thing is that the principles that
underlie the functions of a single celled
organism, like a bacterium, are very similar to
those principles that govern the cells in a human
body. So the very short and to the point answer to
your question is "YES!" Keep asking good
Every tissue in our body is made up of millions
and millions of cells. Depending on if it is
your kidney, or your skin, the cells are a little
different in order to do the job they need to do.
Skin cells need to be able to protect our bodies
and need to be able to re-grow very quickly if we
are injured. Kidney cells need to be able to
filter out the bad stuff and un-needed nutrients
from our blood.
Cells are the building blocks of our bodies.
Think of our bodies as a book,full of chapters,
words and letters. Chapters are similar to our
systems(nervous system, endocrine system, vascular
system, etc) Each of our systems (book chapters)
are made up of organs (heart, lungs, stomach,
skin,etc). Organs are similar to words, in that
the words work together in a specific order to
make a chapter of a book just like organs work
together to make up our systems. So lastly cells
are similar to letters. Letters come together in
a specific order to make each word and each work
is made up of different letters. Cells come
together in a specific order to make organs.While
this is somewhat simplified, it hopefully shows
how much a part cells play in our body.
Yes. Our bodies are made of cells (about 100
trillion of them for an average-sized human).
They make up all parts of our bodies.
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