Surgeon taking heart blood sample from harbour porpoise (Phocoena phocoena) during necropsy to discover cause of death, Royal Zoological Society, London, UK
By: Gavin Parsons
Oxford Scientific
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Two Hearts
By: Eric Anthony Johnson
Brand X Pictures
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Meat selection in store
By: Matt Carr
Workbook Stock
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Frog vein wall showing the thinner wall as compared to an artery. (Magnification x100)
By: Garry DeLong
Oxford Scientific
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Cornish Game Hens
By: Stok-Yard Studio
FoodPix
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Mammal heart (cardiac muscle), showing sarcomeres, myofibrils, and associated mitochondria. TEM X48,400.
By: Dr. Fred Hossler
Visuals Unlimited
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#74732748
Beijing, Peoples Republic of China
By: Stuart Fox
Gallo Images
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Primate Cardiac Muscle
By: M I WALKER
Photo Researchers
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Close-up of a raw heart of lamb with sliced bell peppers