concept

Human heart (mitral valve) tissue displaying calcification

Human heart (aortic valve) tissue displaying calcification

Digitalis purpurea (Purple foxglove)

Cardiac muscle stained for mitochondria. Mitochondria provide the energy to power contraction of the muscle.

Digitalis lanata (Woolly foxglove)

Adult sheep (ovine) heart

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Cardiac

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Human heart (aortic valve) tissue displaying calcification

Human heart (mitral valve) tissue displaying calcification

Human heart (mitral valve) tissue displaying calcification

Human heart (aortic valve) tissue displaying calcification

Adult sheep (ovine) heart