COVID-19 Covid-19 (microscopic 3D structure diagram)
Coronavirus disease 2019, abbreviated as COVID-19, is an infectious disease caused by severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2), which has led to a sustained outbreak and become one of the deadliest epidemics in human history.
Blue algae (microscopic 3D schematic diagram)
Cyanobacteria, also known as blue-green algae, are a type of large single-cell prokaryotic organism with a long evolutionary history, Gram negative staining, no flagella, containing chlorophyll-a but not chloroplasts (different from eukaryotic algae), and capable of oxygen producing photosynthesis. The difference from photosynthetic bacteria is that photosynthetic bacteria (red snails) undergo more primitive photosynthetic phosphorylation and do not release oxygen during the reaction process, making them anaerobic organisms, while cyanobacteria can carry out photosynthesis and release oxygen.
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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