- Okay, chloroplasts are
the organelle
that where photosynthesis
takes place.
And just like we looked at the
anatomy of the mitochondria,
we're going to look at
the close up anatomy
of the chloroplast.
This is an--what?
A picture that was a tough word
to come up with,
of a chloroplast and again
I want you to notice
that there is an outer membrane,
an inter membrane space,
and an inner membrane.
The inter membrane space is
irrelevant for us
when we're talking about
the process of photosynthesis.
I do want you to notice that
the chloroplast also has
its own DNA.
Its own ribosomes.
The key structures that
we£re going to look at here
are these flatten stacks of
pancakes inside the chloroplast.
So let£s draw a picture because
that£s how my brain works
and we'll label the parts that
are important for you to know.
I do, wow that£s
a huge chloroplast.
Do you see that yeah, it totally
looks different than
the mitochondria already?
It looks very different.
It does have its own cytoplasm.
The cytoplasm in a chloroplast
is called stroma.
It also has those little stacks
of pancakes.
And so I'm gonna draw them
like this.
They have space inside them.
That is very good.
Look I£m drawing more.
And then there£s
going to be more.
Okay, whatever. So you get the
idea and now watch.
The whole stack
is called a granum.
That£s singular.
Plural is grana.
So I£m going to write that
down, too. Like grandma.
Grana is plural.
So there are three grana
in my chloroplast drawing.
And this is one grana.
A granum is made up of several
structures called thylakoids.
And the thylakoid
is a single pancake.
This is a thylakoid.
In this granum I have one,
two, three, four thylakoids.
I have a total of eight,
nine, 10, 11 thylakoids
in my drawing.
There is a thylakoid space, okay
I£m going to turn this into
thylakoid space because look,
I£m pointing to
the inside of it.
And then I£m going to turn this
into a thylakoid.
I've told you that it£s really
similar to cellular respiration.
Are you feeling the love?
Like this space has some
potential here.
Maybe something is going to be
happening inside my thylakoid.
True story.
I think those are
all the pieces. It£s green.
It£s green for
a reason, Dog Pounds.
It£s green because there are
pigments embedded
in these thylakoids and there.
Look at all my pigments.
There are--I'm going to tell you
what they're called.
It£s chlorophyll.
Chlorophyll is a pigment that£s
embedded in all
and it£s why my chloroplasts
look green.
All right. What£s the point
of a chloroplast?
Remember that we£re taking
energy,
light energy from the sun here.
And we£re somehow turning that
light energy into sugar.
And that happens
in the chloroplast.
So light energy,
we have to take a second.
We have to do a little aside on
light and figure out
what exactly is light in order
to make this whole thing happen.
