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Essay On Cells Of The Human Body

Essay on Cells and their parts

732 Words3 Pages

Cells are some of the smallest organisms around. All living things consist of cells, and yet they are invisible to the naked eye. Cells are the basic structural and functional units of life. Cells are made up of many different parts which allow them to function properly.

All cells are separated from their surrounding by a cell membrane. The cell membrane regulates what enters and leaves the cell and also aids in the protection and support of the cell. A cell membrane is similar to the walls surrounding your house.

In plants the cell membrane is surrounded by a cell wall. The cell wall is outside the cell membrane, and its purpose is to help the membrane protect and support the cell. Since the cell wall is very porous, water, oxygen,…show more content…

Chromosomes contain the genetic information that must be passed to each new generation of cells. Chromosomes are what you pass on to your children to make them who they are, it’s the DNA of a cell.

The cytoplasm is the area between the nucleus and the cell membrane. The cytoplasm contains many important structures. This area is basically the main place where you will find structures that help the cells stay alive.

Mitochondrion is an importance structure that lies in the cytoplasm area. Mitochondrion is the plural word for mitochondria, which is the key organelle that converts energy from one form to another. Mitochondria changes the chemical energy stored in food into compounds that are more convenient for the cell to use. The mitochondrion contains two special membranes. The outer membrane surrounds the organelle, and the inner membrane has many folds that increase the surface area of the mitochondrion.

Ribosomes are the structures in which proteins are made. Cells that are active in protein synthesis are often crowded with ribosomes. Ribosomes are composed of RNA and protein. Some ribosomes are attached to the membranes, and some are free in the cytoplasm. Ribosomes are among the smallest of organelles. They are no larger than 25 nanometers in diameter. A nanometer is equal to one billionth of a meter.

Many cells are filled with a complex network of tube like things known as the endoplasmic reticulum. The endoplasmic

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Essay about The Human Body: The Muscular System

543 Words3 Pages

The human body is composed of many different systems working cooperatively. Unlike other body systems, there are some that are essential for circulation, locomotion and posture; the muscular system being one of those. Muscles, the main constituents of this system, are organs that serve in converting chemical signals into mechanical forces which permit the movement of the body (Campbell, 2012). The basic units of this system are muscular cells. This type of cells originates from the mesoderm where the development results in a buildup of myofilaments in the cytoplasm and the formation of specialized parts and channels. A type of muscles in the iris, which is an exception, originates from the ectoderm (Paulsen, 2010).
There are several…show more content…

The human body is composed of many different systems working cooperatively. Unlike other body systems, there are some that are essential for circulation, locomotion and posture; the muscular system being one of those. Muscles, the main constituents of this system, are organs that serve in converting chemical signals into mechanical forces which permit the movement of the body (Campbell, 2012). The basic units of this system are muscular cells. This type of cells originates from the mesoderm where the development results in a buildup of myofilaments in the cytoplasm and the formation of specialized parts and channels. A type of muscles in the iris, which is an exception, originates from the ectoderm (Paulsen, 2010).
There are several types of muscles that serve unique functions and are distributed in different parts of the body. The three main types of muscles that differ in morphology and function are skeletal, cardiac, and smooth muscles.
Skeletal Muscles
Skeletal muscles make up a big percentage of muscle mass in the human body ranging from 36 percent to 42 percent depending on the gender of the person. With their attachment to the skeleton, these muscles have the ability to produce contractions and to move muscle components over large spans. The contractions are voluntarily controlled by motor neurons originating from the spinal cord and by specific neurotransmitters; mainly the neurotransmitter acetylcholine (Campbell, 2012). The bundles of

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