BIO202H5 Lecture Notes - Lecture 3: Buccal Pumping, Countercurrent Exchange, Lamprey
Document Summary
Impossible to come back and differs from acclimation and acclimatization. Animals through evolution needed to change systems to adapt to environment. 15 ventilation= getting oxygen available gas exchange; ventilator surface respiratory system oxygen is available to animal via. Air or water medium will need velum directs water into gill sacs there"s water flow through mouth lamprey; (unidirection; and tidal) Water flow is unidirectional will never go back out. Lamprey are adapted in a way to use gill spaces in a tidal ventilation. Gill sacs will aid with gas exchange delivery of oxygen to circulatory media. Lamprey has unidirectional flow where it goes from one opening to. Lamprey must attach its mouth for a long time while feeding so it got this. Water enter through gills, gas exchange happens then water expels through the same. Helps water to be directed to the gills. Contraction of muscles in throat create a negative pressure which help water pass spaces.
