{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

IMG_NEW_0002 - system of insects for gas transport to and...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
TECTURE 3: Respiration and Gas Exchange 1. Respiratory systems facilitate Oz and COz transfer As animals get larger, they must maximize SA to bring 02 in. Therefore, respiratory systems do several things to facilitate Oz uptake: increase SA decreases diffusion distance increase blood supply 2. Gas exchange organs reflect different respiratory media , Air ' Oz is plentiful {.21% at sea level) . is less dense and less viscous . breathing air is relatively easy and not that efficient (we extract only 25% of air we inhale) Water . contains 40 x less 02 as air (and much less at higher temPeratures and salinities) high density/viscosity = hard to move breathing in water in relatively energy- demanding; needs to be highly efficient 3. Trachea -network of tubes throughout insect body -tubes are kept from collapsing by thick rings of chitin -trachea branch into finer tracheoles, which supply individual cells -gas exchange occurs at the ends across moist membranes -compensates
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: system of insects for gas transport to and from tissues 3. Gills GILLS are an external organ and are very different from lungs due to the of nof t4., epithelium to increase SA. Site of gas exchange is the secondary lamella" n\ flfl ventilation is.tlNlglBECIloNAL due to properties of water Blood flow is COUNTERCURRENI Water and \----blood flow in opposite directions. This maintains a gradient along the gill exchange surface (secondary lamellae) and allows the almost complete transfer of 02 3. Lungs LUNGS are an organ of small volume which allows for: Q maximization of respiratory S.A. Qu"n small diffusion distance covered in rab handout. rib n"t'lo'*va J Mammals use negative-pressure breathing /P$c# 2d' f#;r air into rungs) and air no* iffi t^effiffi Automatic controlof breathing (Fig. a2.271 ;rkb*) . breathing is regulated by involuntary mechanisms \-__...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern