Answer:
Proteins and phospholipids make up most of the membrane structure. The phospholipids make the basic bag, while the proteins are found around the holes and help move molecules in and out of the cell.
The retina and optic nerve are part of the central nervous system, as they are derived from the neural tube. We know that oligodendroglia provide myelin for the central nervous system and Schwann cells provide myelin for the peripheral nervous system. Therefore, oliogodendroglial cells must provide the myelin for the optic nerve.
So it is the concentration of carbon dioxide<span> that plays the major part in governing the</span>rate<span> and depth of </span>breathing<span>. ... This produces an increase in the </span>rate<span> of lung ventilation, which quickly brings the CO</span>2<span> concentration of the alveolar air, and then of the blood, back to normal levels.</span>
