Training. According to the American Physical Therapy Association, there were more than 200 accredited physical therapy programs in 2013. Master of Physical Therapy or Master of Science in Physical Therapy degrees are no longer offered in the U.S., and PTs in training now receive a Doctor of Physical Therapy degree.
Cell Membrane. The cell membrane (plasma membrane) is a thin semi-permeable membrane that surrounds the cytoplasm of a cell. Its function is to protect the integrity of the interior of the cell by allowing certain substances into the cell, while keeping other substances out.
cell membrane. A cell membrane is like a cell's gatekeeper. It's the outer layer that surrounds a cell, letting substances in â or keeping them out. A membrane is a barrier that offers protection, like a rubber membrane that keeps rain from seeping under your roof. A cell membrane surrounds and protects the contents of a cell. It controls which substances can enter and exit the cell. The membrane also gives a cell its shape and enables the cell to attach to other cells, forming tissues.