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Results for: 'Anatomy and Chemical Makeup of a Single Hair (Animation)'

Primary Active Transport - electrochemical gradient and ion transport / water movement

By: HWC, Views: 2144

Energy derived from ATP changes the shape of a transporter protein which pumps a substance across a plasma membrane against its concentration gradient An electrochemical gradient is a gradient of electrochemical potential, usually for an ion that can move across a membrane. The gradient consis...


By: Administrator, Views: 5068

Conjunctivitis, also known as pink eye, is inflammation of the outermost layer of the white part of the eye and the inner surface of the eyelid. It makes the eye appear pink or reddish. Pain, burning, scratchiness, or itchiness may occur. The affected eye may have increased tears or be "stuck shu...

Febrile Seizure

By: Administrator, Views: 4968

The majority of epilepsy cases are idiopathic (cause not identified) and symptoms begin during childhood or early adolescence. A child who has a seizure while standing should be gently assisted to the floor and placed in a side-lying position. In adults, epilepsy can occur after severe neu...

Mycobacterium tuberculosis: Drug Resistance and Natural Selection

By: HWC, Views: 1002

The evolution of drug resistance in microorganisms, such as M. tuberculosis, that cause human diseases is of particular concern to biologists. When Mycobacterium tuberculosis infects the lungs of humans, it causes the disease tuberculosis, also called TB. Once infected, the lungs act as a new...

EpiPen Animation (Part 1)

By: Administrator, Views: 5782

An epinephrine auto-injector is a medical device for injecting a measured dose or doses of epinephrine by means of autoinjector technology. It is most often used for the treatment of anaphylaxis. The first epinephrine auto-injector was brought to market in the 1980s.

Ankle Inversion Animation

By: Administrator, Views: 123

Eversion–Turning outward. Inversion–Turning inward.

Dendrite Animation

By: Administrator, Views: 5209

Dendrites (from Greek δένδρον déndron, "tree"), also dendrons, are branched protoplasmic extensions of a nerve cell that propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project. Electrical stimula...


By: HWC, Views: 1176

Living things must accomplish a great number of tasks just to get through a day, and these tasks are accomplished by a diverse range of biological molecules. In the range of tasks that molecules accomplish, however, proteins reign supreme. Almost every chemical reaction that takes place in living...

Simple and Double Sugar

By: HWC, Views: 1789

Here are the molecular structures of three simple sugars: glucose, ribose, and fructose. Look at these simple sugars and identify what characteristics they all share. As you can see, all of the carbohydrates have carbon, hydrogen, and oxygen in a ratio of 1:2:1 and there is always a double bo...