THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Every cell lining the small intestine bristles with thousands of tightly packed microvilli that project into the gut lumen, forming a brush border that absorbs nutrients and protects the body from intestinal bacteria.

Detailed explanation-2: -Microvilli: The cells on the villi are packed full of tiny hairlike structures called microvilli. This helps increase the surface of each individual cell, meaning that each cell can absorb more nutrients.

Detailed explanation-3: -The epithelium (outer layer) of villi is made of a mucous-membrane layer. The layer has different types of cells. The tall, narrow columnar cells of villi called enterocytes are covered in microvilli. The microvilli lining the villi cells are about 1 micrometer.

Detailed explanation-4: -The gut is lined by cells containing brush borders, which are composed of arrays of microvillar protrusions that help in nutrient absorption and provide a barrier against pathogens and toxins. Microbes such as E. coli can destroy microvilli with potentially life-threatening results.