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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.
many-celled, complex organisms with cell differentiation and specialised tissues performing life...
a form of asexual reproduction. It is an unequal cell division, in which a small cell forms...
a substance found in certain fatty foods or manufactured in the liver. High levels of...
the spontaneous movement of molecules, atoms or ions, from an area of higher concentration to an...
small, non-pigmented plastids that occur in roots and non-photosynthetic tissues of plants. They...