3.2 Human Gas Exchange Flashcards
1
Q
Outline the structures in the human gas exchange system.
A
- alveoli
- bronchioles
- bronchus
- trachea
- lungs
2
Q
Describe the adaptations of the alveoli.
A
- many alveoli so increases the surface area : volume
- thin wall so short diffusion distance
- extensive capillary network maintains a steep concentration gradient
3
Q
Describe the mechanism of inhalation.
A
- diaphragm contacts and external intercostal muscles contact
- volume increases and pressure decreases in the thoracic cavity
4
Q
Describe the mechanism of exhalation.
A
- diaphragm relaxes and internal intercostal muscles contract
- volume decreases and pressure increases in thoracic cavity
5
Q
What are some risk factors that increase the incidence of lung disease?
A
- smoking
- exposure to pollution
6
Q
What is a correlation.
A
Correlation is an association or relationship between variables.
7
Q
What is a causation.
A
A causation occurs when one variable is influenced by another.
