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specialised heart muscle tissue between the right atrium and right ventricle which conducts the normal electrical impulse from the atria to the ventricles.
extremely small infectious particles that can only reproduce inside a host cell.
an endocrine gland attached to the base of the hypothalamus, which secretes hormones that play a...
the blood circuit from the heart to the body and back to the heart.
a collection of tissues joined in a structural unit to serve a common function.
found in the cell wall of xylem cells where the secondary cell wall is absent but the primary...