sac

The larvae can alter the pH of the sac walls, causing the resilin to expand or contract.

From Science Daily ● Jul. 27, 2026

In a dark room, a doctor pointed to an hourglass shape glowing on the ultrasound screen: There was her amniotic sac, funneling into her dilated cervix, and there was their tiny daughter’s foot, dipping out.

From Salon ● May 27, 2026

Then came the worst part: I passed the amniotic sac.

From The Wall Street Journal ● May 13, 2026

The next day she was diagnosed with pericarditis - an inflammation of the fluid-filled sac around the heart.

From BBC ● Oct. 12, 2025

“Is this true?” asked the rat, eyeing the sac suspiciously.

From "Charlotte's Web" by E.B. White

The researchers next placed the larvae inside miniature pressure chambers to determine how much pressure the air sacs could withstand before collapsing.

From Science Daily ● Jul. 27, 2026

They had been believed to be fraternal twins because they developed in different amniotic sacs, but doctors found their markers were exactly the same while assessing Grace as a potential stem cell donor.

From BBC ● Jun. 9, 2026

In another chapter, Mr. Haskell follows the path of an owlet moth into the cranefly orchid’s flower and lets us watch how sacs of pollen attach themselves to the insect’s eye.

From The Wall Street Journal ● Apr. 17, 2026

The spiders’ white egg sacs, usually laid between October and November, are often attached to leaves, tree bark and flat structures and contain 400 to 500 eggs, according to Jorowatch.

From Los Angeles Times ● Apr. 9, 2026

This wasn’t too difficult, as the younger boys took one look at the shiny, wrinkled gray sacs and turned away in horror; you couldn’t have paid them to put one in their mouths.

From "The Evolution of Calpurnia Tate" by Jacqueline Kelly