extensor

"It is hard work to swim against the current."

"the resistance of bacteria to certain antibiotics"

"Several people have lost their suitcases. Whose have you found?"

"Check the oil in your car once a month."

"She straightens her messy hair before going to school. "

"I asked her age."

"If you still feel unwell tomorrow, see your doctor."

"The child carefully straightened the crumpled paper before handing it to the teacher. "

"Muscle consists largely of actin and myosin filaments."

"My elbow is aching from all the homework I've been doing. "

"The muscle contraction during exercise resulted in a temporary reduction in the size of the arm. "

"The company extends its office hours until 7 PM to handle the increased customer demand. "