| air vesicles | One of the thin-walled saclike terminal dilations of the respiratory bronchioles, alveolar ducts, and alveolar sacs across which gas exchange occurs between alveolar air and the pulmonary capillaries. Synonym: alveoli pulmonis, alveolus, air cells, air vesicles, bronchic cells. (05 Mar 2000) |
|---|---|
| malpighian vesicles | The minute air-filled vesicle's on the surface of an expanded lung. (05 Mar 2000) |
| coated vesicles | Vesicles formed when cell-membrane coated pits (coated pits, cell-membrane) invaginate and pinch off. The outer surface of these vesicles is covered with a lattice-like network of the protein clathrin. Shortly after formation, however, the clathrin coat is removed and the vesicles are referred to as endosomes. (12 Dec 1998) |
| seminal vesicles | Two structures about 5 cm long behind the bladder and above the prostate gland which contribute fluid to the ejaculate. (12 Dec 1998) |
| synaptic vesicles | Membrane-bound compartments which contain transmitter molecules. Synaptic vesicles are concentrated at presynaptic terminals. They actively sequester transmitter molecules from the cytoplasm. In at least some synapses, transmitter release occurs by fusion of these vesicles with the presynaptic membrane, followed by exocytosis of their contents. (12 Dec 1998) |