Prior to the Apollo missions, life support in space suits was connected to the space capsule via an umbilical cable. However, with the Apollo missions, life support was configured into a removable capsule called the Portable Life Support System that allowed the astronaut to explore the Moon without having to be attached to the space craft. The EMU space suit, used for spacewalks, allows the astronaut to manually control the internal environment of the suit. The Mark III suit has a backpack containing about 12 pounds of liquid air for breathing, pressurization, and heat exchange.
prior to the apollo missions life support in space suits was connected to the space capsule via an umbilical cable however with the apollo missions life support was configured into a removable capsule called the portable life support system that allowed the astronaut to explore the moon without having to be attached to the space craft the emu space suit used for spacewalks allows the astronaut to manually control the internal environment of the suit the mark iii suit has a backpack containing about 12 pounds of liquid air for breathing pressurization and heat exchange