BIO 201 Lecture Notes - Lecture 8: Neural Crest, Squamata, Body Plan
Document Summary
Indeterminate growth (regulative: blastophore does not form mouth, radial cleavage, coelom forms from outpocketing of gut, different type of photoreceptors, monociliated cells in the epidermis, creatine phosphate as phosphate storage, no chitin. In one state, collagen is stiff and non-elastic toughness and rigidity. In one state, collage is soft and fluid flexibility and deformability: change is rapid and controlled by nervous system, cl. In pharyngeal cavity: secretes mucous and iodinated proteins that trap food particles in prochordata, thyroid gland in most vertebrates (production of iodinated hormones) Amphibia: mostly carnivorous, lungs not very efficient, most gas exchange is through moist thin epidermis covered with mucus, skin is semi-permeable. Shelled amniotic egg: amnion, allantois, chorion, leathery shell, embryo is nourished by yolk sac. Reptiles, birds and mammals: amniotes: embryo develops in amniotic sac, oviparous: amniotic eggs with shells (reptiles, birds and monotreme mammals)
