Lecture 20 - BIOL104-04 Principles of Biology I Lecture#20...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
BIOL104-04 Principles of Biology I October 13, 2010 Lecture #20 Ch 49 Respiratory System
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Introduction to Respiratory System Every cell in the body must exchange material with its surrounding environment – Single cells organism exchange occurs directly across membrane – Multicellular organisms require specialized systems for transport & exchange Structural adaptations to increase surface area allows the needs of every cell to be met
Image of page 2
Introduction to Gas Exchange Cellular respiration in mitochondria – Uses O 2 and produces CO 2 as waste Challenge for multicellular organisms – Obtaining sufficient oxygen – Disposal of excess carbon dioxide Respiration at body system level involves – Mechanics of breathing – Exchange of oxygen & CO 2 in respiratory organs
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Gas Exchange Involves Ventilation, Circulation & Respiration
Image of page 4
Gas Exchange Involves Diffusion Across Membranes External environment in gas exchange is always aqueous Terrestrial vertebrates – Oxygen from air dissolves in a thin layer of liquid that covers the respiratory surfaces Diffusion process is passive – Driven by the O 2 & CO 2 concentrations on two sides of the membrane – For dissolved gases concentration is expressed as pressure
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Fick’s Law of Diffusion Five things govern the rate of diffusion – Solubility of the gas in the aqueous film lining the gas exchange surface – Temperature – Surface area available for diffusion – Difference in partial pressures of the gas across the gas-exchange surface – Thickness of the barrier to diffusion
Image of page 6
Fick’s Law of Diffusion
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Evolutionary strategies have maximized gas diffusion
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the 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