Murfreesboro is a city in Pike County, Arkansas, United States. The population was 1,764 at the 2000 census. The city is the county seat of Pike County. Crater of Diamonds State Park is located just to the south. The crater is an eroded lamproite pipe where diamonds were discovered in 1906. 100,000 were found by 1933, and visitors to the park may still take away whatever they can find.
The guard cells surround each stoma in a plant cell. They regulate  the opening and closing of stomata to facilitate gas exchange and  control transpiration in plants.
The Guard cells control the openings of the stoma in plants. When light hits the guard cells, it caused the cell to pump potassium ions into the guard cells. As potassium is p â¦ umped into the guard cell, the water potential decreases. This drop in water potential causes the water from the intercellular spaces and surrounding cells to enter the guard cell increasing the turgidity and opening the stoma.