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an enzyme that catalyses (speeds up) the hydrolysis (breaking) of a chemical bond.
a gland which secretes substances, usually enzymes, through a duct directly to the part of the...
a molecule that is formed when oxygen and haemoglobin combine chemically.
liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the...
the blood circuit from the heart to the lungs and back to the heart.