Answer: a) respiratory arrest
Explanation: the neuro-muscular blocking agent causes muscles to relax, respiration is vital for oxygen intake and and proper functioning of vital organs. Respiration depends on the diaphragm muscles for the expansion and contraction of the lungs; administration of NMBA can hamper the diaphragm muscles and this could be fatal hence, respiratory arrest should be watched out for.
Answer:
in controlled experiment an independent variable is systematically manupulated and dependent variable is measured ; any extraneous variables are controlled
