Animal Cell Picture Biography
Source:- Google.com.pk
All living organisms are made up of cells and new cells are produced when live cells divide. The cell is the smallest unit of life in an organism. The cell lives and, as a result, the organism lives. Whatever an organism does for survival it does for the survival of its cells.
Microscopes
The first microscopes were composed of a single lens just like a magnifying glass. They were called simple microscopes. Later microscopes were designed using 2 lenses. They are called compound microscopes. The top lens through which you look is called the eyepiece while the lower lens that is close to the slide is called the objective lens. They are called compound microscopes. The magnification power of a compound microscope is calculated by multiplying the magnification of the 2 lenses. Since these microscope use light to see the objects they are called light microscopes.
Below is a diagram of a compound light microscope. Learn the various parts. You will be using the microscope in your biology study.
TOP
Robert Hooke
In 1665 Robert Hooke used a light microscope to study cork. He noticed that the cork was composed of many small boxes. He named the compartment cells because they reminded him of prison cells.
It is now known that all living things are composed of cells. They are measured using the unit micrometer. The symbol for micrometer is µm. A µm is one thousandth of a millimetre.
TOP
Animal Cells
The diagram below is an animal as may be seen using a light microscope. All the living matter of a cell is called protoplasm. The cell is surrounded by a cell or plasma membrane. The nucleus is the control centre of the cell. The cytoplasm surrounds the nucleus. The cytoplasm is everything within the cell except for the nucleus. There are many small organelles within the cytoplasm. This is where most of the cell’s activities take place. The cytoplasm is composed of 90% water. They cannot be seen using a light microscope. They will be discussed later.
TOP
Plant Cells
The diagram below is a plant cell as may be seen using a light microscope. All the living matter of a plant cell is also called protoplasm. The cell is surrounded by a cell or plasma membrane. Unlike the animal cell the plant cell also has a cell wall surrounding it. This is made of cellulose and is very rigid. It supports the plant cell. The nucleus is the control centre of the cell. The cytoplasm surrounds the nucleus. The vacuole is a storage area for the plant cell. The vacuole contains cell sap. This is made of sugars, salts, and pigments. The chloroplasts contain chlorophyll. This is where photosynthesis occurs within the cell.
TOP
The Ultrastructure of Cells
With the invention of the electron microscope a whole new world was open up to scientists. Most light microscopes will enlarge a specimen up to 1000 times (1000X) but the electron microscope enlarge the specimen 250,000X and higher! Using these microscopes scientists were able to discover parts of the cell never seen or known of before. The fine detail of a cell when seen by an electron microscope is called ultrstructure.
TOP
Cell Membrane (Plasma Membrane)
Below is a diagram of a part of the plasma membrane. Note that they are composed of phospholipid molecules and protein. The phosphate heads of each molecule is on the outside of the structure while the lipid tail of each are on the inside part of the membrane. The protein location varies along the membrane. Note that there are pores along the membrane. This is where materials enter and leave the cell. The parts of the membrane move around constantly. That is why the membrane is said to be fluid. This is called the fluid mosaic model of the plasma membrane.
Click here to view an animation of the structure of the plasma membrane
TOP
Plasma Membrane Functions
The membranes allow some materials to enter the cell but not all materials. Thus, the membrane is said to be semipermeable. Water, oxygen and carbon dioxide freely pass through it, many other chemicals cannot. Another term used for this aspect of the membrane is selectively permeable.
The membrane keeps cell contents together allowing efficient coordination of its activity. It helps the cell keep its contents.
Give support to the cell.
Recognise (sense) molecules that touch them.
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
Animal Cell Picture Animal Cell Model Diagram Project Parts Structure Labeled Coloring and Plant Cell Organelles Cake
No comments:
Post a Comment