Facts about Human Cell How many cells are in our human body?
Cells live, they do their duty and they die
Majority of cells in the human body are bacterial cells, and most are beneficial.
Cells are the smallest living units that are capable of reproducing themselves.
There is no real consensus on the number of cells in the human body. Estimates put the number
between ten trillion and one hundred trillion
Recently, scientists said that Cells final count is 37.2 trillion.
How did these researchers come up with 37.2 trillion?
They actually broke down the number of cells by organs and cell types,
Example, there are 50 billion fat cells in the average body, and 2 billion heart muscle cells. Adding all those up, they got 37.2 million.
Everyone’s body is made of the same basic stuff.
All living things, large or small, plant or animal, are made up of cells.
Most living things are made up of one cell and they are called unicellular organisms.
Many other living things are made up of a large number of cells that form a larger plant or animal.
These living things are known as multicellular organisms. Water makes up about two thirds of the weight of cells.
The number of cells depends on the size of the person: bigger person, more cells. Also, the number of cells in our body keeps changing as old cells die and new ones form.
All the parts of our body are made up of cells.
There is no such thing as a typical cell.
our body has many different kinds of cells.
Though they might look different under a microscope, most cells have chemical and structural features in common.
In humans, there are about 200 different types of cells, and within these cells there are about 20 different types of structures or organelles.
Each cell has a size and shape that is suited to its job.
Cells that do the same job combine together to form body tissue, such as muscle, skin, or bone tissue.
Groups of different types of cells make up the organs in your body, such as your heart, liver, or lungs.
Each organ has its own job to do, but all organs work together to maintain our body.
Cells are so small that most can only be seen through a microscope.
Every cell is made from an already existing cell.
Each cell in the body has two major components, the cytoplasm and the nucleus.
All cells have a membrane.
Cell membranes are the outer layers that hold the cell together.
They let nutrients pass into the cell and waste products pass out.
Not everything can pass through a cell membrane.
What gets through and what doesn’t depends on both the size of the particle trying to get in and the size of the opening in the membrane.
Cells also have a nucleus. This is the cell’s control center.
Cells continually divide to make more cells for growth and repair in your body.
The nucleus contains the information that allows cells to reproduce, or make more cells.
Another important part of a cell is the mitochondrion.
This is the part of the cell where food and oxygen combine to make energy.
The cytoplasm contains the structures that consume and transform energy and perform many of the cell’s specialized functions, including storing and transporting cellular materials, breaking down waste, and producing and processing proteins.
The nucleus is the control center and contains the genetic information that allows cells to reproduce.
The mitochondrion (plural mitochondria) in the cell is the factory where food and oxygen combine to make energy.
Food is the energy the cell needs.
Each cell needs oxygen to burn (metabolize) the nutrients released from food.
The body has some cells that do not experience cell division.
And red blood cells and outer skin cells have cytoplasm but do not have a nucleus.
In the cell, the process is called respiration.
Oxygen breaks down the food into small pieces.
The oxidizing of the food molecules is turned into carbon dioxide and water. Water makes up about two-thirds of the weight of the cell.
The energy released is used for all the activities of the cell.
The cell membrane has receptors that allow the cell to identify surrounding cells.
Different kinds of cells release different chemicals, each of which causes certain other types of nearby cells to react in certain ways. Within each of these different cells are found twenty different types of organelles, or structures.
Slightly over two hundred different kinds of cells make up the human body.
The shape and size of each type of cell is determined by its function.
Muscle cells come in many different forms and have many different functions.
Blood cells are unattached and move freely through the bloodstream.
Skin cells divide and reproduce quickly.
Some cells in the pancreas produce insulin, others produce pancreatic juice for digestion.
Mucus is produced in cells in the lining of the lung. Our lungs also contain alveolar cells that are responsible for taking in gas from the blood.
The cells that line the intestine have extended cell membranes to increase the surface area, helping them absorb more food.
Cells in the heart have a large number of mitochondria to help them process a lot of energy, because they have to work very hard.
Nerve cells generate and conduct electrical impulses; for the most part, they do not divide.
Each Nerve cell has a specific place in our nervous system.
Nerve cells outside of the brain are very long and have the task of passing signals between the brain and the rest of the body, allowing us to move our muscles and sense the world around us. The rest of our nerve cells—about one hundred billion of our body’s cells—are brain cells.
Brain cells are the most important cells in our bodies. It is our brain that defines who we are.
Brain cells in children under five do have the ability to reproduce, to some extent. However, we are naturally losing brain cells all the time. The best estimate of normal brain cell loss is put at nine thousand per day.
That may seem like a large number, but remember that the brain has 100 billion
Cells, so a nine-thousand-cell loss per day is not that great. Inhalants, such as glue, gasoline, and paint thinner, cause brain cell loss at thirty times the normal rate. Excessive alcohol use is a big contributor to brain cell damage.
Cells that all do the same job make up tissue, such as bone, skin, or muscle. Groups of different
types of cells make up the organs of the body. Different organs grouped together form a system, such as the digestive system or the circulatory system. All the systems working together make up a healthy human body.
Liver cells last about a year and half.
Red blood cells Live for 120 days.
Skin cells are good for 30 days.
White blood cells survive for thirteen days.
Average adult loses close to 100 million cells every minute but they are replaced every minute and it keeps going on
The number of cells that an adult male loses per minute is roughly 96 million. Fortunately, in that same minute, about 96 million cells divided, replacing those that died.
Just as we shed dead skin cells, dead cells from internal organs pass through and out of the body with waste products.
How Many Atoms Are There in a Human Cell?
According to an estimate made by engineers at Washington University, there are around 1014 atoms in a typical human cell.
Another way of looking at it is that this is 100,000,000,000,000 or 100 trillion atoms.
Watch the video - BBC Secret Universe: The Hidden Life of the Cell - Understand how a cell works
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Tuesday, January 07, 2014
Tags – General Knowledge Science Cell Facts
07 January 2014
Facts about Human Cell How many cells are in our human body?