ANP 1105 Lecture Notes - Lecture 4: Mast Cell, Proteoglycan, Blood Plasma

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Ottawa U

Document Summary

Ex. epidermis of the skin separates the inside from the outside of the body. Also, the epithelium lining in the bladder separates the bladder wall from the urine. As an interface issue epithelium has many funcions: protecion, absorpion, filtraion, excreion, secreion, sensory recepion. Epithelial issue characterisics: polarity: all epithelia have an apical surface, an upper free surface exposed to the body exterior or the cavity of an internal organ, and a lower atached basal surface. All epithelia exhibit apical/basal polarity, the cell regions near the apical surface difer from those near the basal surface in both structure and funcion. Most apical surfaces have microvilli which give them a fuzzy appearance (brush border). Some epithelia (lining of the trachea) have cilia. Lying next the basal surface is the a supporing sheet- basal lamina: specialized contacts: epithelial cells it close together to form coninuous sheets (except for glandular epithelia).