Ch30

Which of the following actions increase the volume of your lungs?

• The diapphragm flattens and moves downward.

• The rib cage becomes smaller.

• Air pressure increases inside the lungs

• Gases move from areas of lower pressure.

The huge surface area in the lungs were Oxygen is absorbed and Carbon Dioxide is released is in the

• trachea

• bronchi

• alveoli

• bronchioles

The blood in veins is

• leaving the lungs.

• moving in single file.

• carrying oxygen.

• traveling to the heart.

The arteries and arterioles of the circulatory system transport Oxygen to the

• mouth

• lungs

• cells

• heart

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Blood is carried to and from the cells of the body by the

• arteries

• capillaries

• muscles

• veins

Oxygen inhaled into the alveoli diffuses into the

• capillaries

• arteries

• adjacent alveoli

• bronchioles

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The Oxygen molecules in the blood bind to an iron-rich protein called

• hemoglobin

• carbonic acid

• uric acid

• dissolved gas

The nervous system regulates breathing by

• overriding signals during exercise.

• monitoring dissolved gases in the blood.

• maintaining a constant rate of inhalation.

• constricting the blood vessels in the lungs.

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How does asthma affect the structures of the lungs?

• It causes the bronchioles to constrict.

• It destroys alveoli over time.

• It makes the lungs produce mucus.

• It relaxes the diaphragm too much.

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Why does Carbon Dioxide diffuse from the blood into the alveoli?

• Carbon Dioxide concentration is higher in the blood than in the alveoli.

• The brain signals the alveoli to absorb Carbon Dioxide.

• When Oxygen leaves the blood, another gas must replace it.

• There is not enough hemoglobin to carry the Carbon Dioxide.