Write a note on surfactants and Why do premature babies have low surfactant?
Which of the followig statements are true about surfactants ? (i) Thin non- cellular films made of protein and phospholipids - covering alveolar membrane. (ii) Their synthesis begins only after the 25^(th) week of gestation . (iii) They lower the surface tension in the alveoli and prevents the lungs from collapsing. (iv) They are synthesised and secreted by type II cells of the squamouse epithelial cells of alveoli.
The synthesis of surfactants begins only after the ________ week of gestation.
What are neurons? What are their functions.
What are spontaneous reactions? What are the conditions for the spontaneity of a process?
