Spacesuits are necessary protection for the dangerous environmental conditions of space, which include extreme temperatures and radiation without pressure or oxygen. Without a spacesuit, the low pressure would cause lungs to inflate and rupture, and the removal of oxygen from the bloodstream within 15 seconds would lead to loss of consciousness and death due to deoxygenated blood reaching the brain. A spacesuit also prevents hypothermia by providing insulation for the musculatory system.