Main article: Cell membrane. The cell membrane, or plasma membrane, is a biological membrane that surrounds the cytoplasm of a cell. In animals, the plasma membrane is the outer boundary of the cell, while in plants and prokaryotes it is usually covered by a cell wall.
Egypt lies between the Red Sea to the east and the Mediterranean Sea to the north. The Red Sea is a narrow, landlocked sea that separates Africa from the Arabian Peninsula. It links to the Mediterranean through the Gulf of Suez and the Suez Canal.
The Celtic Sea is an area of the Atlantic Ocean, generally located to the south of Ireland. It's bordered in the northeast by St. George's Channel, and in the east by the Bristol Channel, and English Channel.The region's Celtic heritage gave the sea its name, one suggested in 1921 by E. W. L. Holt. This somewhat generic name helps avoid any nationalistic controversies between countries.t's bordered in the northeast by St. George's Channel, and in the east by the Bristol Channel, and English Channel. The region's Celtic heritage gave the sea its name, one suggested in 1921 by E. W. L. Holt.