In order to answer why the cell would need aquaporins when the plasma membrane is permeable to water, we need to understand the make-up of water and the cell membrane. The water molecule is polar with its H+ and OH- ions. Cell membranes are selectively permeable.
Anatomy of the Auricle. The auricle or pinna is a relatively large appendage on the side of the head. It is prominent in most people and plays a very important role in hearing â it directs sound waves into the ear canal. The auricle is composed of cartilage which is covered by skin.
An enchondroma is a type of benign (noncancerous) bone tumor that originates from cartilage. Cartilage is the specialized, gristly connective tissue from which most bones develop.Cartilage plays an important role in the growth process.There are many different types of cartilage throughout the body. An enchondroma most often affects the cartilage that lines the inside of the bones.artilage is the specialized, gristly connective tissue from which most bones develop. Cartilage plays an important role in the growth process. There are many different types of cartilage throughout the body. An enchondroma most often affects the cartilage that lines the inside of the bones.