cardiac conduction system
The cardiac conduction system is the structure in the heart responsible for generating and conducting electrical signals to ensure that the heart beats rhythmically.
Small intestine wall cross-section (microscopic 3D structural diagram)
The small intestine wall is divided from the inside out into mucosal layer, submucosal layer, muscular layer, and serosal layer. The small intestine, as an important organ in the human digestive system, has functions such as digestion, absorption, motility, and immunity.
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