sphincters

"The teacher required the students to bring their textbooks to class every day. "

"The tight bandage was constricting his arm, making it hard to move. "

"The tall fence surrounds the playground, keeping the children safe. "

"the iris sphincter in the eye"

"The athlete's physiological responses to the intense workout were carefully monitored by the coach. "

"After a long day at work, taking a warm bath is very relaxing. "

"Turn the doorknob to open the door."

"The coffee maker is functioning properly this morning, so I can have my coffee. "

"The carpenter used a T-square to draw a normal to the edge of the wooden board. "

"His bodily deficiencies were a heavy burden to him."

"Muscle consists largely of actin and myosin filaments."

"The carpenter used a strong metal band to hold the broken wooden beam together. "