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the blood circuit from the heart to the body and back to the heart.
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
an endocrine gland attached to the base of the hypothalamus, which secretes hormones that play a...
the process of removing salt and other minerals from seawater, to make it drinkable.
neurons that transmit nerve impulses away from the central nervous system to the effectors.