Mechanisms of breathing

What happens to the pressure in the lungs when the thoracic cavity expands?

• decreases

• increases

• stays the same

What happens to the volume in the lungs when the thoracic cavity is made smaller

• decreases

• increases

• stays the same

• decreases pressure

What is the path of an air molecule into the lungs?

• trachea, larynx, bronchioles, bronchus

• larynx, trachea, bronchus, bronchioles

• trachea, bronchus, larynx, bronchioles

• bronchus, pharynx, epiglottis, alveloi

What happens at the alveoli?

• air sacs are made

• the chest is raised

• gaseous exchange

• inhalation

What happens to the lung pressure before inhalation

• stays the same

• increases

• decreases

Boyle's law says that the volume and pressure of a gase are inversely proportional, what does this mean?

• if volume increases, then pressure increases

• if volume increases, then pressure decreases

• if volume increases, then pressure stays the same

Using Dalton's Law, what is the partial pressure of gas A in the following:

Total pressure: 160mmHg (gas A + gas B)

Partial pressure of gas B: 55mmHg

• 215mmHg

• 105mmHg

• 8800mmHg

• 2.91mmHg

There is a ____________ resistance to air flow in the trachea than the bronchioles due to ______________ in the trachea.

• higher, larger cross-sectional area

• lower, a smaller cross-sectional area

• higher, a smaller cross-sectional area

• lower, a larger cross-sectional area

High compliance means

• it is easier to expire

• it is harder to inspire

• it is hard to expire

the volume of the airways that isn't involved in gas exchange is known as the

• anatomical dead space

• physiological dead space