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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

The hierarchy of biological classification's eight major taxonomic ranks. The hierarchy of biological classification's eight major taxonomic ranks.
Maslow’s hierarchy of needs. Maslow’s hierarchy of needs.
Metastasis Cancer Order Metastasis Cancer Order
Sequential blending uses a computer to calculate the correct ratio as well as the prescribed order ... Sequential blending uses a computer to calculate the correct ratio as well as the prescribed order ...
Sensory receptor synapses with first-order sensory neuron Sensory receptor synapses with first-order sensory neuron
In Maslow's view, needs operate from the bottom up in this needs hierarchy In Maslow's view, needs operate from the bottom up in this needs hierarchy
Video: Chromosome structural organization/ Mechanisms for chromosome movement Animation

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