Heart muscle structure, computer illustration. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.

- Image ID: KY3WY6
Heart muscle structure, computer illustration. Heart muscle is composed of spindle-shaped cells grouped in irregular bundles. Boundaries between individual cells are faintly visible here. Each cell contains one nucleus, visible as a dark stained spot. Cardiac muscle is a specialised muscle tissue that can contract regularly and continuously without tiring.
Science Photo Library / Alamy Stock Photo
Image ID: KY3WY6

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