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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
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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.
The role of cell-signalling proteins in the morphology of birds' feet.
Animal Cell
cell structure
A Human Cell
A typical eukaryotic cell.
The cell cycle has three stages: interphase, mitosis, and cytokinesis