These muscles increase thoracic cavity dimensions by elevating the first and second ribs during forced inhalation.
A. External intercostals
B. Scalenes
C. Transversus thoracis
D. Internal intercostals
E. Serratus posterior inferior
(
Question 2) These muscles extend from a superior rib inferomedially to the adjacent inferior rib. They elevate the ribs upon contraction, thereby increasing the transverse dimensions of the thoracic cavity during inhalation.
A. External intercostals
B. Scalenes
C. Transversus thoracis
D. Internal intercostals
E. Serratus posterior inferior
(
Question 3) Contraction of these muscles depresses the ribs, but only during forced exhalation.
A. External intercostals
B. Scalenes
C. Transversus thoracis
D. Internal intercostals
E. Serratus posterior inferior
(
Question 4) If all else remains equal, an increase in the difference between atmospheric and alveolar pressure results in an increase in airflow.
Indicate whether this statement is true or false.
(
Question 5) Organize the items listed into the proper sequence of events for gas exchange.
a: O2 is transported to cells by circulatory system.
b: O2 is drawn into the lungs during inhalation.
c: Cells use O2 and generate CO2.
d: CO2 is exhaled.
e: The circulatory system transports CO2 to the lungs.
A. a, b, c, d, e
B. b, a, c, d, e
C. b, a, c, e, d
D. c, e, d, a, b
E. e, d, c, b, a
(
Question 6) The chest wall is anatomically configured to contract inwardly, so that when the thorax is opened surgically its walls collapse.
Indicate whether this statement is true or false.
(
Question 7) Foreign particles that are not filtered out by the respiratory epithelium are
A. dissolved by enzymes in the alveoli.
B. coughed up during normal daily activities.
C. collected by lymph nodes.
D. carried away in blood.
E. stored in nearby pulmonary alcoves.
(
Question 8) During expiration, relaxation of the diaphragm and external intercostals
A. increases the volume of the thoracic cavity.
B. increases the pressure in the thoracic cavity.
C. expands the rib cage.
D. flattens the floor of the thoracic cavity.
E. stimulates the phrenic nerve.
(
Question 9) You may have noticed that after a large meal you have had some difficulty breathing. Which explanation is most accurate with regard to this situation?
A. The food presses on the bronchi, making air flow difficult.
B. The large quantity of food retards pulmonary blood flow.
C. Oxygen to the lungs is restricted due to fullness in the stomach.
D. A full stomach impedes contraction of the diaphragm, limiting inhalation.
(
Question 10) Pulmonary fibrosis
A. decreases elasticity, thereby increasing resistance and decreasing airflow.
B. increases elasticity, thereby increasing resistance and decreasing airflow.
C. decreases elasticity, thereby decreasing both resistance and airflow.
D. increases elasticity, thereby decreasing resistance and increasing airflow.
Quick Reply
