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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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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

Elastic fibres are made of elastin, one type of structural protein found in the ECM of animal cells Elastic fibres are made of elastin, one type of structural protein found in the ECM of animal cells
To maintain balance the bipedal pelvis has a foreshortened ilium and is broader and bowl-shaped. The To maintain balance the bipedal pelvis has a foreshortened ilium and is broader and bowl-shaped. The
In a gear-type oil pump, the oil flows through the pump around the outside of each gear. This is an ... In a gear-type oil pump, the oil flows through the pump around the outside of each gear. This is an ...
A point-type ignition system showing the distributor cam which opens the points A point-type ignition system showing the distributor cam which opens the points
Healthy Bone (left) vs Weakened Bone (right) Healthy Bone (left) vs Weakened Bone (right)
Didinium, a barrel-shaped ciliate with tufts of cilia, catching (left) and engulfing (right) Paramec Didinium, a barrel-shaped ciliate with tufts of cilia, catching (left) and engulfing (right) Paramec
Video: Sex-Linked Traits! How are eye colors inherited in fruit flies?

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