PSL280H1 Study Guide - Final Guide: Pinniped, Mammary Gland, Harbor Seal
Document Summary
Respiratory system: composed of nares / blow holes nasal cavity larynx(voicebox) Trachea pirmary bronchi secondary bronchi bronchi bronchiols alveoli: * cartilage of the repiratory is usually complete rings, *process of breathing( opening air way) is voluntary, closing is passive, mysticete 2 blow holes odontocete one blow hole, cetacean and pinniped larynx. Goose beak is supported by thyroid cartilage ( cetaceans) Short trachea which consists of cartilage rings: beluga/ sperm(5-7) dugong(4) manatee (8-12) Pinnipeds 2 arytenoids or throat cartilages that help close off the epiglottis. Pinnipeds have same sized lungs but the right has 4 and left has 3. Cetaceans have a larger , longer and heavier right lung heart pushed left: cetacean have more cartilaginous support, small residual lung volume massive tidal volume. Sea otter: rl( 4 lobes) ll(2lobes) large lung capacity not for diving but buoyancy. Sirenia: extremely long lungs almost as far as the kidneys and aid in buoyancy control: diaphragm is under lungs and runs lengthwise.
