All cells can only come from existing cells. It is the basic unit of life, and everything living has one or more cells. These three rules of cells make up something called cell theory, which applies to every single cell in the world. 

There are 2 types of cells also, eukaryotic and prokaryotic. The difference between them is that the membranes of prokaryotic cells are in an envelope but eukaryotic are not. Eukaryotic cells can be found in plants and animals, and prokaryotic cells can be found in bacteria.

An organelle is something inside of a cell that does a specific function which helps the cell do several things to function. A few examples of organelles are vacuoles, mitochondria, and centrioles.

Plant and animal cells have a lot of differences. Plant cells have a hard covering protecting the cell called a cell wall. It protects the inside of a cell from getting harmed by anything outside of it. The cell membrane, however, can be found in both plant and animal cells. The cell membrane keeps cells safe from viruses and harmful substances. Both cells have a nucleus. The nucleus is like the brain of the cell. Mitochondria, which is also in both types of cells, is the powerhouse of the cell.

Nothing can survive without these little tiny microscopic cells in your body, which I find spectacular.


What are cell’s jobs?

All cells have one thing in common, which is to help the organism and to keep it alive.

Red blood cells carry oxygen and take it from your lungs when you inhale, they spread the oxygen throughout the body, then they bring the carbon dioxide and take it all the way back to your lungs to exhale. Yes, that means that every single breath that you take causes your red blood cells to flow through your body super quickly there and back.

The shape of red blood cells, which is a concave shaped disk, helps carry oxygen and makes it easier for it to flow through your body.

White blood cells are a part of the body's immune system. They fight off diseases, viruses, and things that could harm your body.

For an example, if you have a good immune system, you would have less of a chance to get chicken pox, an illness you get that causes red, itchy dots to appear on your skin, and it would give you a very high fever. (It helps protect you from all diseases, not just chicken pox)

Why would having a good immune system help? Well because, like I said, white blood cells would try to stop the illness from getting into your body. Vaccines create antibodies, which help white blood cells fight them, giving you less of a chance of getting sick. I like to imagine a little fight scene in my head with tiny white soldiers.

Nerve cells can send messages from your brain to all the parts of the body. The shape of nerve cells help send them from a long distance. But, what types of messages do they send? Well, for an example, imagine that you are chopping a carrot and accidentally cut your finger. It would hurt. That is an example of a message from your brain saying, “Hey, stop what you're doing. Don't chop your finger anymore!”

If we didn't have nerve cells, we could chop our fingers off without knowing it. Imagine losing your finger for a carrot.

Or, when you accidentally burn your hand, your nerve cells make you feel pain so you move your hand away.

Xylem cells are only in plant cells. They have a tubular structure and are hollow on the inside. They carry fluids like water  and nutrients throughout the plant to hydrate it. They can also store fluids and nutrients inside of it, which is pretty handy. The roots take nutrients and take water from the soil in the ground, and then it all goes through the xylem to different parts of the plants.

Every single cell in our bodies are useful to us somehow. They do their jobs every single day to help us live.


How do cells function and do their jobs and also help people and living things survive?


Well, there is a large variety of all sorts of cells. There are more than 200 different types of cells in the human body.

Cells give the body structure, and they take nutrients from food that we eat and turn it into energy so we could move around and do everyday things. It also gives cells energy too, cells need to take in energy as well. With energy, cells get to duplicate themselves in order to create more cells.

Cells have a lot of different parts, and each one has a function. Those parts are called organelles.

Cells are inside your body and all around you. A wooden coffee table is made of cells. Well, they may be dead cells, but they were alive once before.

Hair is made up of dead cells. It's kind of strange knowing that you have dead cells growing out of your head. It makes things weird when you say, “Hey, go wash your greasy dead cells.” Or “I'm going to the barbers to cut off my dead cells!”

Hair is fed by blood vessels, which gives it nutrients and everything it needs to stay on our scalp instead of it falling off. Once the hair reaches the skin on our scalp, it dies and so it turns into dead cells.

There are over 100,000 strands of hair on our scalp. 50-100 strands of hair fall out every day, but hair is constantly growing so it gets replaced by new hair strands.

Anyways, what i'm saying is that cells play a big role in our everyday normal lives. Like I had said before, red blood cells carry oxygen from our lungs to all over our body. They travel through our veins and arteries. Red blood cells help us breath.

For an example, if you had a super tight bracelet around your wrist, it is dangerous to keep it on because it can cut off your blood circulation which would stop blood from pumping through your veins and oxygen would not be able to reach your hand, which would turn your hand purple. By doing that, you could lose the ability to use your hand. 

All cells matter and are very important to us. If one type of cell in our bodies stopped working, it could cause death, pain and danger to our bodies functions.


Assess the functions of cells.


. Cells are the basic unit of all life forms.

. Human bodies are made of jillions of all different types of cells that major in their own specific functions.

. Cells give the body structure and gain nutrients from food which helps cells work better in order for your body to function.

. Cells collect together which make up tissues and tissues group together to form organs in our body such as lungs, kidneys, the heart, brain etc.

. Organelles perform a specific function. They can only be found in eukaryotic cells.

. Organelles can do things like making protein, converting chemicals and creating energy for the cell.

. The nucleus is the brain of the cell. It could be found in the centre of the cell. Both plant and animal cells have a nucleus.


I conclude that…

Cells are specifically made to do different jobs in organisms. Cells have organelles inside of them. They remind me of organs inside of a human because they help cells to function and keep staying alive. Organelles all have one main function to help a cell live.