1. During inspiration, the intrapulmonic pressure: A. Increases B. Decreases C.

Question

1. During inspiration, the intrapulmonic pressure:

A.       Increases

B.       Decreases

C.       Goes to zero

2. Which of the following causes an increased ventilation of the lungs?

A.       Decreased CO2 in the blood

B.       Increased CO2 in the blood

C.       Increased PO2 of arterial blood

D.       Increased pH of the blood (decreased hydrogen ion concentration)

3. As an animal grows, its surface area increases as a _____ function, while its volume increases as a _______ function.

A.       Cubic, cubic

B.       Cubic, square

C.       Square, cubic

D.       Square, square

4. Diving or falling into very cold water will reflexively:

A.       Make you take a deep breath

B.       Slow HR and stop respiration

C.       Increase HR and heat production

D.       Cause your knee to jerk

5. The connection neurons for the baroreceptor reflexes are in the:

A.       Cartotid sinuses

B.       Aortic arch

C.       Medulla oblongata

D.       Right atrium

Explanation / Answer

1. During inspiration, the intrapulmonic pressure:
A. Increases
B. Decreases
C. Goes to zero

The answer is B. Decreases.

The air enters in to the lung during inspiration. During inspiration the intrapulmonary pressure decreases below atmospheric pressure which leads to the air enters in to the lung.

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