Anna is a cna who has been leaning over doing bed baths on patients who cannot move in their bed. after two hours, anna has a backache. which body mechanics principle was she likely violating? a. breathe properly when exerting energy b. use the largest and strongest muscles and joints c. keeping her body over her base of support d. proper alignment

D, because she was leaning over for too long then she is used to

Explanation:

during longer space exploration trips, crewmembers may develop vision impairment risks and short-term cardiac atrophy or a decrease in the size, strength, weight, and activity of the heart during space flight because they can experience microgravity. in addition, the long-term medical condition is loss of bone mineral density and radiation exposure.

it contracts and pulls the lungs downwards. this opens the lungs and chest cavity and allows air to come into the lungs.