Nitric oxide(no)-secreted by neurons as a nerotransmitter growth factors these are peptides and proteins,stmulate growth of various tissues,prostagland modified fatty acids
The outer ear which consists of the ear lobe, the ear canal (auditory canal) and the superficial layer of the ear drum (tympanic membrane). This part collects sound waves and directs it to the middle...
The three main parts of the ear are the outer ear, middle ear and the inner ear. The outer ears function is to funnel or pass sound waves through the ear to the middle ear. The middles ears function...