Animal Cells Biography
Source:- Google.com.pk
Cells are the Starting Point
Structure of generic animal cell All living organisms on Earth are divided in pieces called cells. There are smaller pieces to cells that include proteins and organelles. There are also larger pieces called tissues and systems. Cells are small compartments that hold all of the biological equipment necessary to keep an organism alive and successful on Earth.
A main purpose of a cell is to organize. Cells hold a variety of pieces and each cell has a different set of functions. It is easier for an organism to grow and survive when cells are present. If you were only made of one cell, you would only be able to grow to a certain size. You don't find single cells that are as large as a cow. Also, if you were only one cell you couldn't have a nervous system, no muscles for movement, and using the internet would be out of the question. The trillions of cells in your body make your life possible.
One Name, Many Types
Animal and plant cells
There are many types of cells. In biology class, you will usually work with plant-like cells and animal-like cells. We say animal-like because an animal type of cell could be anything from a tiny microorganism to a nerve cell in your brain. Plant cells are easier to identify because they have a protective structure called a cell wall made of cellulose. Plants have the wall; animals do not. Plants also have organelles like the chloroplast (the things that make them green) or large water-filled vacuoles.
Different types of animal cells
We said that there are many types of cells. Cells are unique to each type of organism. Humans may have hundreds of types of cells. Some cells are used to carry oxygen (O2) through the blood (red blood cells) and others might be specific to the heart. If you look at very simple organisms, you will discover cells that have no defined nucleus (prokaryotes) and other cells that have hundreds of nuclei (multinucleated). The thing they all have in common is that they are compartments surrounded by some type of membrane.
Cell Wall - What's it for?
Cell wall diagram While cell membranes might be around every cell, cell walls made of cellulose are only found around plant cells. Cell walls are made of specialized sugars called cellulose. Cellulose provides a protected framework for a plant cell to survive. It's like taking a water balloon and putting it in a cardboard box. The balloon is protected from the outside world. Cellulose is called a structural carbohydrate (complex sugar) because it is used in protection and support.
Cell walls also help a plant keep its shape. While they do protect the cells, cell walls and cellulose also allow plants to grow to great heights. While you have a skeleton to hold you up, a 100-foot tall redwood tree does not. It uses the strong cell walls to maintain its shape. For smaller plants, cell walls are slightly elastic. Wind can push them over and then they bounce back. Big redwoods need strength in high winds and sway very little (except at the top).
Another Hole in the Wall
Holes in the cell wall A cell wall is not a fortress around the delicate plant cell. There are small holes in the wall that let nutrients, waste, and ions pass through. Those holes are called plasmodesmata. These holes have a problem: water can also be lost. But even when the plant cell loses water, the basic shape is maintained by the cell walls. So if a plant is drooping because it needs water, it can recover when water is added. It will look just the same as when it started.
More Than Walls in Plants
You may hear about cell walls in other areas of biology. Bacteria also have a structure called a cell wall. Fungi and some ptotozoa also have cell walls. They are not the same. Only plant cell walls are made out of cellulose. The other walls might be made from proteins or a substance called chitin. They all serve the same purpose of protecting and maintaining structure, but they are very different molecules.
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cells Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
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