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The Nerve Impulse

By: Administrator, Views: 12733

The action potential explained.

Anatomy and Chemical Makeup of a Single Hair (Animation)

By: HWC, Views: 5936

The hair's outer cuticle surrounds hair cells filled with tough keratin macrofibrils. Each macrofibril consists of smaller microfibrils. A microfibril is made up of three keratin polypeptide chains. The chains are linked together by disulfide bonds. A hair consists of keratin chains held...

Chemical Synapse Animation

By: HWC, Views: 5111

A neuromuscular junction is a chemical synapse between the axon endings of a motor neuron and a muscle cell. A narrow synaptic cleft separates the presynaptic cell (the motor neuron) from the postsynaptic cell (the muscle cell). The presynaptic cell contains vesicles filled with neurotransmitt...

Digestion Animation

By: Administrator, Views: 11361

The mouth or oral cavity is formed by: - The hard and soft palates at the top or roof - the cheeks - the tongue - the lips Contains the teeth and salivary glands. The gingivae (gums) surround the necks of the teeth. The lingual frenulum is a thin fold of mucous membrane that connects...

Chemical Messengers Animation

By: Administrator, Views: 11311

Three types of chemical messengers.

Green alga life cycle Animation

By: HWC, Views: 2362

Chlamydomonas zoospores are haploid flagellated cells. As long as conditions are favorable, these cells reproduce asexually. As many as sixteen cells may form by mitosis within a parent cell. Daughter cells escape when the cell wall ruptures. When conditions become less favorable, the...

Virtual Tour of the Heart

By: Administrator, Views: 10547

Everything you need to know about your heart

Neuron Type Animation

By: Administrator, Views: 10717

Interneurons: - Are called central or associative neurons. - Located entirely within the central nervous system. - They function to mediate impulses between sensory and motor neurons.

Inflammatory response Animation

By: HWC, Views: 4286

Any tissue damage or bacterial invasion can bring about inflammation. The inflammatory response can be triggered by an invasion of bacteria, or by a cut or other physical damage to cells. Chemicals, such as histamine, released by the bacteria or damaged cells. accumulate in the tissue. Thes...