Bio 26 Unit 2 Seatwork Respiratory

Question 1

Ventilation perfusion coupling means that more blood flows past functional alveoli than past nonfunctional alveoli.

Answer 1

true

Question 2

The olfactory mucosal lining of the nasal cavity contains the receptors for the sense of smell.

Answer 2

True

Question 3

The functions of the nasal conchae are to enhance the air turbulence in the cavity and to increase the mucosal surface area exposed to the air.

Answer 3

True

Question 4

The lungs are perfused by two circulations: the pulmonary and the bronchial. The pulmonary circulation is for oxygenation of blood. The bronchial circulation supplies blood to the lung structures (tissue).

Answer 4

True

Question 5

Changes in arterial pH can modify respiration rate and rhythm even when carbon dioxide and oxygen levels are normal.

Answer 5

True

Question 6

Intrapleural pressure is normally about 4 mm Hg less than the pressure in the alveoli.

Answer 6

True

Question 7

During normal quiet breathing, approximately 750 ml of air moves into and out of the lungs with each breath.

Answer 7

False

Question 8

The alveolar ventilation rate is the best indexof effective ventilation.

Answer 8

True

Question 9

In chronic bronchitis, mucus production is decreased and this leads to the inflammation and fibrosis of the mucosal lining of the bronchial tree.

Answer 9

False

Question 10

Labored breathing is termed dyspnea.

Answer 10

True

Question 11

The largest amount of carbon dioxide is transported in the bloodstream in the form of carbonic anhydrase.

Answer 11

False

Question 12

Increased temperature results in decreased O2unloading from hemoglobin.

Answer 12

False

Question 13

The paired lungs occupy all of the thoracic cavity.

Answer 13

False

Question 14

Valsalva’s maneuver involves closing off the glottis (preventing expiration) while contracting the muscles of expiration, causing an increase in intra-abdominal pressure.

Answer 14

True

Question 15

Smoking diminishes ciliary action and eventually destroys the cilia.

Answer 15

True

Question 16

Tracheal obstruction is life threatening.

Answer 16

True

Question 17

The parietal pleura lines the thoracic wall.

Answer 17

True

Question 18

The average individual has 500 ml of residual volume in his lungs.

Answer 18

False

Question 19

Atelectasis (lung collapse) renders the lung useless for ventilation.

Answer 19

True

Question 20

The Hering-Breuer reflex is a potentially dangerous response that may cause overinflation of the lung.

Answer 20

False

Question 21

Strong emotions and pain acting through the limbic system activate sympathetic centers in the hypothalamus, thus modulating respiratory rate and depth by sending signals to the respiratory centers.

Answer 21

True

Question 22

As carbon dioxide enters systemic blood, it causes more oxygen to dissociate from hemoglobin (the Haldane effect), which in turn allows more CO2to combine with hemoglobin and more bicarbonate ions to be generated (the Bohr effect).

Answer 22

False

Question 23

Dalton’s law states that the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture.

Answer 23

True

Question 24

Oxygenated hemoglobin releases oxygen more readily when the pH is more basic.

Answer 24

False

Question 25

Nasal conchae mainly work on inhalation to warm and moisten air. They serve minor functions for exhalation.

Answer 25

False

Question 26

Under certain conditions, the vocal folds act as a sphincter that prevents air passage.

Answer 26

True