Which is a symptom of lung cancer ?
Changes in color of the mucus that is coughed up from the lower airways
Blood pressure and heart rate are increased
Shortness of breath
Difficulty in breathing
What is the percentage of CO2 in the air we breathe out?
0.03%
4%
6%
2%
1. Taking in of O2 and giving out of CO2 2. Diffusion of O2 into blood and CO2 out of blood.3. Transport of oxygen to the cells.4. Combination of glucose inside cells to release energy.
Main cause of emphysema, a serious disease of respiratory tract is:
Polluted water
Tobacco smoking
Uncooked food
Polluted air
The respiratory control center of humans is located in the:
blood-brain barrier
alveoli
erythrocytes
brainstem (medulla oblongata)
What body structure protects the lungs from outside harm?
Cartilage
Tiny sacs
The rib cage
The diaphragm
