PNB 2250 - Exam 1 Questions with Complete Solutions 100% Verified| Latest
Update Graded A+
How do we solve problem of alveoli weakness? Pulmonary surfactant
Pulmonary surfactant Complex mixture of proteins, phospholipids, & cholesterol
True/False: Pulmonary surfactant forms in water droplets False - water in a sheet
Amphibians have how many lungs? What type? Two bidirectional
Reptiles have how many lungs? What type? One bidirectional
Birds have how many lungs? What type? Multiple air sacs, unidirectional
Mammals have how many lungs? What type? Two bidirectional
Amphibians are _____ breathers Positive pressure
Ventilation Muscle contraction to drive air movement
Diaphragm contraction Changes lung volume, decreases pressure
Ventilation passageways Conducting paths, no gas exchange
,Ventilation respiratory membrane Alveoli
____ is required to ventilate the lungs O2
____ is the driving force in terrestrial animals, but not aquatic animals CO2
Problem with Cutaneous respiration Skin must be thin, making it fragile and subject to
desiccation
Why can't mammals breathe through skin? Skin is too thick
Tracheal respirations Diffusive system
Series of hollow pipes (trachea) throughout an insect's body
Spiracles "Doors" involved in tracheal respiration
Tracheole A small pipe that branches off the trachea in an insect and is used for gas
exchange
What is a limiting factor for insect size? Respiration - amount of O2 being exchanged
How are birds able to be suspended in air Hollow bones reduce their density, lift supplied by
wings
Where does gas exchange in birds? Parabronchi
, Where does gas exchange in birds during exhalation? Air sac
The common ancestor of present fishes had ______ Gills & lungs
If life developed in the ocean, what was the drive toward terrestrial existence? - Danger of
desiccation
- Gills poorly suited for terrestrial life
Present evidence says the drive to ______ drove the formation of gills Osmoregulate
When did air breathing fish first appear? 430 MYA
Lungs in fish likely evolved from _____ Swim bladders
Air-gulping in fish most likely developed in ____. Why? Warm, shallow water
Energy required to swim to the surface is significant.
4-Cycle breathers Lung to mouth
Mouth to air
Air to mouth
Mouth to lung
2-Cycle breathers Outside to lungs
Lungs to outside
Update Graded A+
How do we solve problem of alveoli weakness? Pulmonary surfactant
Pulmonary surfactant Complex mixture of proteins, phospholipids, & cholesterol
True/False: Pulmonary surfactant forms in water droplets False - water in a sheet
Amphibians have how many lungs? What type? Two bidirectional
Reptiles have how many lungs? What type? One bidirectional
Birds have how many lungs? What type? Multiple air sacs, unidirectional
Mammals have how many lungs? What type? Two bidirectional
Amphibians are _____ breathers Positive pressure
Ventilation Muscle contraction to drive air movement
Diaphragm contraction Changes lung volume, decreases pressure
Ventilation passageways Conducting paths, no gas exchange
,Ventilation respiratory membrane Alveoli
____ is required to ventilate the lungs O2
____ is the driving force in terrestrial animals, but not aquatic animals CO2
Problem with Cutaneous respiration Skin must be thin, making it fragile and subject to
desiccation
Why can't mammals breathe through skin? Skin is too thick
Tracheal respirations Diffusive system
Series of hollow pipes (trachea) throughout an insect's body
Spiracles "Doors" involved in tracheal respiration
Tracheole A small pipe that branches off the trachea in an insect and is used for gas
exchange
What is a limiting factor for insect size? Respiration - amount of O2 being exchanged
How are birds able to be suspended in air Hollow bones reduce their density, lift supplied by
wings
Where does gas exchange in birds? Parabronchi
, Where does gas exchange in birds during exhalation? Air sac
The common ancestor of present fishes had ______ Gills & lungs
If life developed in the ocean, what was the drive toward terrestrial existence? - Danger of
desiccation
- Gills poorly suited for terrestrial life
Present evidence says the drive to ______ drove the formation of gills Osmoregulate
When did air breathing fish first appear? 430 MYA
Lungs in fish likely evolved from _____ Swim bladders
Air-gulping in fish most likely developed in ____. Why? Warm, shallow water
Energy required to swim to the surface is significant.
4-Cycle breathers Lung to mouth
Mouth to air
Air to mouth
Mouth to lung
2-Cycle breathers Outside to lungs
Lungs to outside
