The contractile vacuole acts to regulate quantity of water in a cell. In freshwater environments the concentration of solutes inside the cell is higher than outside the cell (i.e., the environment is hypotonic).he contraction of the contractile vacuole and the expulsion of water out of the cell is called systole. Water always flows first from outside the cell into the cytoplasm, and is only then moved from the cytoplasm into the contractile vacuole for expulsion.
Induced coma. A barbiturate-induced coma, or barb coma, is a temporary coma (a deep state of unconsciousness) brought on by a controlled dose of a barbiturate drug, usually pentobarbital or thiopental.
A coma is induced in patients who are at high risk of brain injury, either from physical trauma (as in the case of Giffords, who was shot in the head in 2011), a drug overdose, or a disease such as meningitis, rabies or status epilepticus (a long-lasting and life-threatening seizure).isks of a medically induced coma. Like most medical procedures, an induced coma carries some risks. One of the consequences that we do know of is an increased risk of infection, Souter said.