hi so today we're going to introduce the
human body and we're going to do this
by basically just doing a general
overview of anatomy and physiology
and then from there in the subsequent
lectures we will go a little bit more in
detail about the different organ systems
so first off let's talk about anatomy
and physiology
when we talk about it we normally use
the two words together but they are
actually two separate disciplines
anatomy is going to be the study of the
structures of the body
whereas physiology is going to be the
study of how those body parts are
actually functioning so here you have a
table
that just shows you the differences
between the branches of anatomy
and the branches of physiology for
example a radiologist or someone who's
going to study things like x-rays
and look at images of the structures of
the body would actually be studying the
branch
under anatomy whereas let's say a
cardiologist
or neurologist is going to be really
studying the physiology and specifically
the pathophysiology
when making diagnoses
so now let's just talk about the human
body
and the way that it is organized so when
we
see we visualize the human body let's
think about that as like a book
and so we start at the the most basic
level of any book or in is going to be
the letters
in the book so and this way
we have the chemical level the chemical
level
is going to be made up of your atoms and
your molecules
these are the most basic structures of
the human body from there
we have our words so the words in the
book
are now the most functional part of the
book
so when you just have letters if you
just threw a whole bunch of letters onto
a page they wouldn't make sense
but once you put those letters into
functional units known as
words now we are able to actually start
doing things
this is the same when we talk about the
cellular level
the body is made up of trillions of
cells
and these cells are the basic functional
unit
of the human body
when we take a group of cells and we put
them all together
we get the tissue level so
a group of similar cells working
together
are going to make tissues in the body
and there are several different types of
tissues
found in the human body and so the
tissue level would be
like in a book taking those words and
putting them into sentences
so then we take our sentence and we're
going to take multiple sentences
put them together and make a paragraph
this would be similar to your organ
level
so at the organ level now we're going to
take different types of tissues
and we're going to put them all together
in order to perform
some type of function and that's when we
get our different organs so examples of
organs are going to be things like the
heart
the stomach the eyes
the nerves and the neurons all of these
things
are different types of organs and then
from there we take our paragraph and we
put that into chapters
so a chapter is usually about one
specific
subject and in the same way our organ
systems or the system level is when you
have a group of
organs working together to perform a
function
so an example of a system would be like
the digestive system
which is involved in the digestion of
the nutrients that we take in
from our external environment and how
our body uses those nutrients
and so finally we get our book
the book is the organism or the
organismal level
where we're taking all of the chapters
we put them together and we make our
story
the story of the body
so let's now talk about things from
the system level
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