 Here we are with the first level of organization that illustrates or contains or has all the qualities of life and that is the cell. The cell is a defining structure in biology classes because it there are similarities all cells share a lot of similarities and you can imagine we will talk about it in detail in this class just like we're gonna spend time talking about chemistry. We're gonna spend time looking at the cell. I want to draw your attention just a second to the cells that are actually in this picture. These are cells. They're called HeLa cells and they actually were stolen from a woman looking for medical care for cervical cancer. She died and and from cervical cancer and in the process of attempting to get treatment for her condition her cells were taken and grown, reproduced, what made more of and they became a cell line in biological sciences that are very common. There's lots and lots of science experiments, projects, research that are happening using this woman's cells. The cells were harvested for the use in science without her permission. She and her family didn't ever receive notification let alone compensation for the use of these cells which is a really interesting, concerning perhaps conversation about life and rights and there's a book that you might be interested in. If you want to learn more about this it's called The Immortal Life of Henrietta Lacks. There's actually a movie now I think and I haven't seen it. I haven't read the book either but I am aware of the incredible the incredible value of her cells and the way that she was used and not compensated for what she offered to science. Wild that her cells can survive without her and continue to do good in the world. Super interesting. Okay so cells as we know they combine to form tissues and the imaging used on this is I think this is really pretty because it has um let me see if I can find my I don't know if you can see my mouse at the moment but um the red circles are the nuclei in the cells themselves so you can actually kind of see some of those um subatomic um no you can see some of the organelles that make up the cell themselves. Here's another view but this time we have multiple cells. All the red dots are cells you can see them in here. These are a certain kind of cell and the big green one is a different kind of cell. These are all cells that are found in your brain so these are nervous system cells and remember tissues are when different kinds of cells get together and and work together for a common function. This is an example of different kinds of cells that are working together. We often think of neurons as like the main the main dish the main point of a um of the nervous system it's the neurons but in us our neurons are about 10% of our nervous system cells and we have a lot of other cells that do work of taking care of the neurons of moderating the environment that they are in and even moderating the messages that neurons send. Nervous tissue super cool tissues as you know can combine to form organs and if you zoomed out of that last picture we would see all those cells working together different kinds of cells working together. If you zoom your way out you're going to end up with the brain and that's an example of an organ. The heart is an organ muscle muscle organs like your biceps freaky eye that's an organ it's a whole bunch of different kinds of tissues that are working together for a common function. After we have organs we have an entire system so the organs different organs working together make up a system the nervous system would be brain spinal cord nerves those are all different organs working together in the nervous system the musculoskeletal system is an organ system made up of all these different bone organs and muscle organs that make up these systems digestive system awesome system mouth esophagus stomach intestines out zone organ systems that do work for the body and if you put a whole bunch of organ systems together you get an organism. This guy is just hanging out living his best life in the glorious sun it feels like that's probably a nice cozy warm place that that guy's hanging out hanging out and he's made up all those levels of organization that we've talked about so far ultimately you get to this level now just like I mean just like life is challenging to define defining an organism you may think that it's super intuitive like I know exactly I am one organism it becomes rather complicated and we will explore those complications as we go organisms live together so let's look at multicellular critters and how they interact in the world