What is the percentage of CO2 in the air we breathe out?
0.03%
4%
6%
2%
The respiratory control center of humans is located in the:
blood-brain barrier
alveoli
erythrocytes
brainstem (medulla oblongata)
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
Cough and sputum production are the most common symptoms of:
Lung cancer
Emphysema
Chronic bronchitis
Homeostasis
Oxygen moves from the lungs into the bloodstream through:
nerve fibres
a large artery in the heart
small blood vessels in the lungs
a tube in the lungs called the jugular vein
The expansion of the lung and inhalation of air are in part the result of:
the muscles of the lungs relaxing, allowing the lungs to get larger.
decreased pressure of the interpleural fluid.
the contraction of the muscles of the diaphragm.
the muscles of the lungs relaxing, allowing the lungs to get smaller.
