BIOL108 Lecture Notes - Lecture 33: Keratin, Mechanoreceptor, Thermoregulation

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Lien Luong

Document Summary

Amniote phylogeny: synapsids: includes mammals and numerous extinct taxa. Contrasts with the anapsids (0) and diapsids (2) Dentary bone: in the jaw; very big. In mammals, the jaw consists of only the bone. Separate the nasal passages from the oral cavity. Chewing and breathing at the same time. Secrete nutritious fluid (milk) to feed offspring. Movement of leftover jaw bones to the middle ear. Reptile ears have only 1 bone, mammal ears have 3. Eardrum moves from close to outside in reptiles to quite deep in head in mammals: endothermic. More differentiated than reptile dentition (looks pretty much the same) Greater diversity of tooth from both within and individual and between species. Occludes (bottom and top contacts) more closely than those of reptiles. Allows food to be ground more finely. Greater surface area allows more nutrients to be extracted more rapidly. Compared to reptiles who typically continually replace teeth over lifespan: limbs.