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Muscle Cells

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Oesophagus and peristalsis
How the muscle cells in the oesophagus move the food from the mouth to the stomach.
The muscles move in pairs. Behind the food bolus, the circular muscles contract and the longitudinal muscles relax. In fron of the food muscles, the the circular muscles relax and the longitudinal muscles contract.

Role and Working of the Stomach
The stomach is an organ that stores and digests food. It can be thought of as a muscular bag, which churns up food, but it is more than just muscle cells.

The inner surface of the stomach is lined with a tissue of epithelial cells that secrete mucus. There are cavities in the lining called gastric pits where tissued of gland cells secrete digestive juiced to break down the food.

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