Class Notes (839,112)
Canada (511,191)
Biology (6,826)
Biology 1001A (1,727)
Lecture 13

Lecture 13: "Introduction To Gas Physiology"

1 Page

Course Code
Biology 1001A
Susanne Kohalmi

This preview shows half of the first page. Sign up to view the full page of the document.
Organismal Physiology Lecture No. 13: Introduction To Gas Physiology Thursday October 25 , 2012 Oxygen & Physiology: -It is essential to receive oxygen for metabolism and exchange it with the environment. Along with CO , 2 oxygen is one of the respiratory gases. Oxygen On Earth: -The composition of “dry” gases (excluding water vapour) in the atmosphere include: about 20% O , 2 0.03% CO an2 78.09% N. 800 mya, oxygen levels were quite low and over time, there has been a rise in the levels of atmospheric oxygen. This has led to the eventual diversification of metazoans, seen most evidently in the Cambrian (approximately 503 mya). Thus, the rise of oxygen and the diversification of animals are definitely correlated (as animals increase in size, they will require a greater demand of oxygen in the environment). Introduction To Oxygen Physiology: -Animals do not actively transport O acro2s respiratory surfaces (no pumping of oxygen). Instead, the movement of O depe2ds on the rate of diffusion. As all cells need to be bathed in fluid to survive (including moist respiratory surfaces), it is necessary for O to 2irst dissolve in liquids and then diffuse across this liquid barrier. The respiratory surface that supplies gas exchange for the entire body of the animal is influenced by three factors: the animal’s s
More Less
Unlock Document

Only half of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.