Bio250 Exam Study Questions with Accurate
Solutions
External Respiration
Gas exchange that occurs at the respiratory exchange site.
Picks up O2 from the environment
Releases CO2 produced by the cells
Internal Respiration
Gas exchange that occurs at the tissues
Picks up CO2 produced by the cells
Drops off O2 to tissues
Ventilation
The convection of air/water over the gas exchange membrane
Perfusion
The circulation of dissolved gasses in body fluids
Atmospheric Pressure
The sum of all gasses and their pressures
Partial Pressure
Each gas exerts a pressure that is proportional to its concentration
Gas moves from high to low concentration
Solubility
The ability of a gas to dissolve in water
Gas Exchange Membrane
, Four major types
1. Body surface
2. Gills
3. Tracheae
4. Lungs
Evagination
The portion of the organism, that grows out of the surface (Extremities)
Gill
Highly permeable
Used in submerged species
External Gills
Protrude from the body
Common in invertebrates and larval amphibians
Internal Gills
Enclosed in a protective cavity
Common in fish species
Buccal Cavity
The "mouth" area of the fish. Molecules eaten and absorbed across the gills pass through here
Gill Slits
The flaps that can open/close depending on when the fish needs them to
Operculum
The flap that covers the gill slits
Gill Arch
Solutions
External Respiration
Gas exchange that occurs at the respiratory exchange site.
Picks up O2 from the environment
Releases CO2 produced by the cells
Internal Respiration
Gas exchange that occurs at the tissues
Picks up CO2 produced by the cells
Drops off O2 to tissues
Ventilation
The convection of air/water over the gas exchange membrane
Perfusion
The circulation of dissolved gasses in body fluids
Atmospheric Pressure
The sum of all gasses and their pressures
Partial Pressure
Each gas exerts a pressure that is proportional to its concentration
Gas moves from high to low concentration
Solubility
The ability of a gas to dissolve in water
Gas Exchange Membrane
, Four major types
1. Body surface
2. Gills
3. Tracheae
4. Lungs
Evagination
The portion of the organism, that grows out of the surface (Extremities)
Gill
Highly permeable
Used in submerged species
External Gills
Protrude from the body
Common in invertebrates and larval amphibians
Internal Gills
Enclosed in a protective cavity
Common in fish species
Buccal Cavity
The "mouth" area of the fish. Molecules eaten and absorbed across the gills pass through here
Gill Slits
The flaps that can open/close depending on when the fish needs them to
Operculum
The flap that covers the gill slits
Gill Arch
