Sentence Examples

  • Highly specialized air-sacs are characteristic of all birds.
  • Special sacs developed from the intersegmental septa lodge the developing ova and sperm.
  • Air-sacs, by which the breathing capacity is much increased.
  • To this category belong certain sacs and pouches.
  • Exchange of gas through the walls of the air-sacs, almost devoid of blood-vessels, can at best be much restricted.