Lecture 9

Question 1

all respiratory systems are influenced by the basic physics of diffusion:

Answer 1

1. Fast and efficient only over very short distances
2. quantity of substance diffusing is directly related to surface area.
3. A concentration gradient drives diffusion.
   All of these interact in the phylogeny of the respiratory system and in fact respiratory systems are simply deigned to overcome these physical limits.

Question 2

What is the basic vertebrate gill plan:

Answer 2

1. blood supply
2. thin respiratory epithelium, folded to increase surface area.
3. Gill skeletal supports and a muscular pump
4. Centralized neural reflex to generate breathing pattern, irrigate the gills.

Question 3

who has gastralia?

Answer 3

turtles, crocodiles and sphenodone

Question 4

How does cuirassal basket assisnt with respiration breathing in most reptiles?

Answer 4

1. Prevents body wall collapse on inspiration
2. pushes up against organs during expiration
3. allows lungs to expand into abdominal cavity