The eustachian tubes explained
By: Alicia M Prater PhD
Ear tubes are actually called Eustachian tubes, or the auditory tubes. They are short, small cartilage and bone canals that connect the middle ear, an air-filled cavity, and the nasopharynx, which is better pictured as the lower nasal cavity behind the mouth. This allows air...
The structure of the ear
By: Morgan Nielsen
Understanding how humans hear is a complex subject involving the fields of physiology, psychology and acoustics. But the structure of the ear in basics is very simple to understand.The ear, or organ of hearing, is divisible into three parts: the external ear, the middle...
The human reproductive system
By: Alicia M Prater PhD
The reproductive system consists of internal and external sex organs and glands necessary for sexual reproduction. Which structures are present depends on a given individual's sex. Sex hormones are chemicals released into the blood to direct the development of male and female sex organs, secondary...
Different types of blood vessels
By: Alicia M Prater PhD
The circulatory system is a complex network of muscular and elastic tubes, called vessels, that connect all of the tissues to a central pump - the heart. Life is dependent on nutrients and oxygen getting to each and every tissue and cell within the human...
The respiratory system
By: Alicia M Prater PhD
Every cell and tissue of our bodies requires oxygen for its functions and produces carbon dioxide as waste. We breathe in oxygen to the lungs where it is exchanged in the alveoli for carbon dioxide in the blood. Red blood cells carry oxygen throughout the...
The skeletal system
By: Alicia M Prater PhD
The skeletal system, known more fondly as the skeleton, is made up of bones connected via cartilage and ligaments at joints. They are also connected to muscles, skeletal muscles to be exact, via tendons. The skeleton provides the frame for the body and supports the...
Cells involved in human immunity
By: Alicia M Prater PhD
Human immunity to disease and infection is both an active and reactive process. Immune cells and their products protect the body from invading organisms, but also actively seek and destroy any that get past the initial lines of defense. Some act on specific targets and...
Do Humans use only 10 Percent of their Brain
By: William Cobbs
We brain specialists say that humans in general use 5% of their brains, not 10%! It is not entirely the fault of the individual. All physically well persons are born with pretty much the same potential, the one non-identifying character being heredity. Brainy people tend...
Do Humans use only 10 Percent of their Brain
By: Joshua Jones
It really depends upon what you mean by "use". Humans use only a small percentage of the brain to process information consciously; however, they use the majority of it when factoring in the perceptions of the senses such as taste, feel, smell, hearing, and sight...
Do Humans use only 10 Percent of their Brain
By: Ted Sherman
HUMOR: Well, yes, some very few special people use ten percent or more of their brains. If you're talking about the most intelligent humans of history. We all know, geniuses like Einstein, Gallileo, Edison, Da Vinci, Michelangelo, the Wright Brothers and the Spears Sisters are...

 

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