Lecture 8

Question 1

What do gases look like in aqueous solutions?

Answer 1

they are seen as bubbles, and the reason they stay this form is due to the proportional partial pressures found in the gas phase and within the water therefore there is no reason to break it apart

Question 2

What way does gases move?

Answer 2

from high to low partial pressures

Question 3

An animal example that shows gas within water?

Answer 3

water beetles, they contain a bubble attached to their back which allows for oxygen from within the water to enter the bubble so it is able to breathe underwater.

Question 4

What is so important about gas diffusion within a animal?

Answer 4

1. gases dissolve better in gasses
2. Gas molecules that bind to other molecules, makes it so that they no longer count towards partial pressure

Question 5

What does convection and diffusion mean and look like within a body?

Answer 5

Diffusion - Oxygen diffuses from high pp from lungs to arteries.

Convection - It is the movement of gas transport over extended distances like getting the oxygen from the mouth to the lungs

Question 6

What does diffusion look like as it crosses the thin membranes, with specialized structures

Answer 6

With lungs - they are inside the body and contain environmental medium

with external gills - they project from the body directly into the environmental medium

Internal gills - they stick off of the body and have something that protects unto the body cavity allowing pumping of the medium

Question 7

how does O2 enter the body, when focusing on the flow

Answer 7

1. Unidirectionally
2. tidal

Question 8

how does the lungs work and what type of flow is it?

Answer 8

Tidal flow and essentially gas is inhaled and then travels via convection to the lungs. Once the lungs are reached the partial pressure is below the environmental medium therefore this causes the shift of O2 to diffuse across the membrane entering into the blood, away from the lungs, then when exhaled it is reverse but CO2 is diffused from the blood into the lungs

Question 9

what does unidirectional flow look like

Answer 9

concurrent there the blood flows in the same direction, oxygenated and deoxygenated

countercurrent, where they move in opposite directions.