Rehab Cell

Physical Medicine and Rehabilitation

Urinary system 1- Functions

Urinary system 1- Functions


– Hello, my little cutelets. So, today, we get to talk about
one of my favorite body systems. I’m pretty sure
that every body system that I talk about is my
favorite body system, but the kidneys really are,
like, one of my favorite body systems. It may be good for you,
it may be not so good for you. Today’s conversation is going to focus
on the anatomy of the kidney, and not so much
how it does its job. We’ll save that for physio, and you will get lots of doses
of how the kidney does its job. Before we dive
into the anatomy, though, we kind of need
to look at an overview of what the kidney does, because its job is really
important. If you remember, the kidneys are
actually retroperitoneal. They’re in the abdominal cavity,
and you can see that here. You can see my diaphragm
up here, defining the superior
border of the abdominal cavity. And you remember that the peritoneal cavity sits
inside the abdominal cavity. The peritoneal cavity contains
many digestive organs, not all of them, though. And part of, for example,
the duodenum is retroperitoneal, the pancreas are
retroperitoneal, behind the peritoneal cavity. Those structures
that are retroperitoneal are definitely included
in the abdominal cavity. The kidneys are
an example of that. When we look at our cadavers, if you don’t remove
the peritoneal cavity, like, break
through the peritoneal cavity, you can’t see the kidneys. Like, it doesn’t even
look like you have kidneys. It looks like you just reached
the back of the body wall, and it’s just
this smooth back wall. But if you go in there
and kind of poke around, you’ll see that the kidneys are
back there, and thankfully they’re
back there. So, let’s talk
about what they do. Their primary purpose,
like, really, if you think about it,
all of us, all critters, really, are just giant bags
of saltwater. Now, think
about that for a second. I’m going to draw you.
Okay. There you are. Actually, I should probably
make a little mouth, and a little digestive system, and a little anus.
Okay. But then the rest of this, all of this part that is not
the inner tube, all the rest of this stuff,
it’s cells. And your cells are filled
with salty water, each cell is. That’s the cytoplasm
of the cell. And the cells are
surrounded by salty water. Blood, if there’s
blood flowing through here, which oh, we already know,
yes, indeed there is. And look, I’m making a little vessel right here
just for the fun of it. I didn’t connect my vessel
to anything, which is a very bad thing. But the blood is salty water
that cells are floating through. The kidneys work
with the circulatory system to basically remove the garbage
produced during metabolism. The job of the kidney– okay, I’m going to draw one here
for you. There’s a kidney. This is not
anatomically correct. The job of the kidney is to take
all your blood and filter it, because as you metabolize, as you go
through processes of life, you make garbage. Think about just
cellular respiration. Think about the process, the cellular mechanism
that results in ATP, which is the energy
currency required for almost all cellular processes. Just making ATP
that your muscles can use, and your neurons can use, and whatever, you make carbon
dioxide as a byproduct. And carbon dioxide is bad news. Like, if you keep carbon dioxide
in your blood, you will get acidic blood. And if your blood gets too
acidic, all the proteins in your system
will stop working. That’s a bad situation.
Like, let’s try to avoid that. So your kidneys do all this work
to get garbage out, and to make sure and monitor
the qualities of this fluid that surrounds everything
in your body. Okay.
Monitoring qualities, like, what kind of
qualities are we monitoring? The kidneys help address pH. They help
maintain ion concentrations. For example, they
maintain sodium ions, potassium ions,
bicarbonate ions. These are just examples.
We’ll talk a ton about this. The kidneys help maintain
glucose concentration. The way a kidney works is it
filters out all of the blood, and then functions
to modify this. The kidneys also maintain,
like, I don’t know if there’s
a better way to say this, but the amount of water
in your system. The kidneys monitor
how concentrated your blood is. If it’s too concentrated, the
kidneys send messages that say, “Dude, we need more water. Let’s make our blood less
concentrated.” So you’ll reabsorb more
water from the system, and maybe even go get
some water and drink it. They’re involved in all sorts
of homeostatic processes. I think where we’re going
to start is we’re going to look
at the gross anatomy of a single kidney, and then we’re going to look
in at the cellular pieces in our kidney that are
functioning as filters. All right.
Gross anatomy first. Here we go.

5 thoughts on “Urinary system 1- Functions

  1. I am now done with my A&P 1&2 classes, and I am confident that without your videos it would have been 10x harder to get through these classes. Thanks for your awesome teaching videos! I have not had to go to any tutoring or anything because of your videos. Honestly, the book and my professor was not helping me grasp the concepts, but once I watched these videos I understood many concepts just by watching the video once!

    For any student looking to pass A&P, I highly recommend these videos from Wendy Riggs! She really made A&P very interesting and fun, but more importantly she teaches in a way that is easy to comprehend.

    Sn: I just felt that I needed to give credit where it is due. I usually don't leave comments, so this speaks how much these videos was a help to me.

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