physiology def Flashcards
1
Q
Respiration
(3)
A
- provides oxygen
- removes CO2
- occurs in:
- Lung (between the air in the alveoli & pulmonary capilla blood)
- Tissue side
2
Q
pulmonary ventilation
A
renewal of air in the lung
3
Q
pulmonary respiration
A
exchange of gases between the alveoli & the pulmonary capilaries by diffusion
4
Q
internal tissue respiration
(2)
A
- oxidation of food by O2
- liberation of energy & disposal of CO2
5
Q
conducting zone includes
(6)
A
- nose
- mouth
- nasopharynx
- larynx
- trachea
- non-respiratory bronchiol
5
Q
respiratory zone includes
(3)
A
- respiratoy bronchioles
- alveolar ducts
- alveoli
6
Q
surfactant
(2)
A
- lipoprotein produced during fetal life
- decreases face tension & prevents collapse
7
Q
intrapleural pressure
(2)
A
- pressure between 2 layers of pleura
- always negative during normal respiration
7
Q
intrapulmonary pressure
A
pressure inside the alveoli during the respiratory cycle
8
Q
transpulmonary pressure
A
pressure difference between alveolar pressure & pleural pressure
9
Q
diffusion
A
gases diffuse from area of high pressure to an area of low pressure
9
Q
gas phase
(2)
A
- movement of gas from the atm til it reaches the respiratory membrane
- O2 moves faster than CO2 in this phase
10
Q
hypoxia
A
low oxygen levels in tissues
10
Q
liquid phase
(2)
A
- movement of gas from alveoli into the blood by diffusion
- CO2 diffuses 20x faster than O2
11
Q
central chemoreceptors
(2)
A
- located in surface of medulla
- responsible for detecting changes in concentrations of O2, CO2, H+
11
Q
chemical control respiration
A
to maintain proper concentration of O2, CO2, & H+
12
Q
hyoxemia
A
low oxygen levels in blood
