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.
The perichondrium (from Greek ÏÎµÏÎ¯ (peri 'around') and ÏÏÎ½Î´ÏÎ¿Ï (chondros 'cartilage')) is a layer of dense irregular connective tissue that surrounds the cartilage of developing bone.It consists of two separate layers: an outer fibrous layer and inner chondrogenic layer.erichondrium can be found around the perimeter of elastic cartilage and hyaline cartilage. Fibrocartilage and articular cartilage both lack perichondrium. Perichondrium is a type of irregular collagenous ordinary connective tissue, and also functions in the growth and repair of cartilage.