"The layer that contracts to churn food or move food along 2.Layer consisting of a membrane that lines a body cavity that opens to the exterior; overlays smooth muscle 3.Areolar connective tissue layer located deep to the mucosa 4.A serous membrane that is the external layer of a GI tract organ"

1.)MUSCULARIS

2.) MUCOSA

3)SUBMUCOSA

4) SEROSA

Explanation:

Muscularis reffers to the smooth muscular layer of the wall of contractile organ found in our body or the thin layer of smooth muscle that forms part of a mucous membrane.One of its main function is in aiding

the propelling of nutrients from the lumen to the submucosa.

mucosa reffers to the membrane that covers different cavities in the body and also lines the surface of internal organs in the body. It has layers of epithelial cells that lyes on the layer of loose connective tissue in the body.

Serosa is found in the organs ofabdominal cavity( outer wall ) it reffers to the membrane that consist of a thin layer of cells.

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.