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Capillaries are the smallest blood vessels in the body and are thin enough to allow for the exchange of materials (such as nutrients, oxygen, and waste products) between blood and surrounding tissues. Their thin walls facilitate this exchange by allowing substances to pass through easily.
A cell is a tiny unit of living material surrounded by a thin membrane.
Mercury has a thin atmosphere that is made up of many gases, including: hydrogen, helium, oxygen, calcium, potassium, sodium and water vapor. Mercury is the smallest planet.
The smallest element in the cytoskeleton is the actin filament, also known as microfilaments. Actin filaments are thin, dynamic fibers made of protein subunits that play a key role in cell structure and movement. They are about 7 nm in diameter, much smaller than microtubules and intermediate filaments.
Australia is the smallest continent.