In a healthy person, which of the following will have the greatest influence on resistance to pulmonary airflow?
A) Respiratory rate
B) Bronchiole diameter
C) Quantity of surfactant
D) Contraction of the diaphragm
E) Atmospheric pressure
B
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Thick projections of muscle in the ventricles that anchor chordae tendineae are called
A) pectinate muscles. B) conus arteriosus. C) papillary muscles. D) trabeculae carneae. E) auricles.
Which carries oxygenated blood from the lungs to the heart?
A. Pulmonary trunk B. Superior vena cava C. Inferior vena cava D. Pulmonary veins E. Pulmonary arteries
The most nutrient absorption takes place in the
A) duodenum and jejunum. B) stomach and duodenum. C) jejunum and ileum. D) esophagus and stomach. E) ileum and cecum.
A sudden increase in pressure within the carotid sinus leads to
a. increased sympathetic nerve activity b. increased parasympathetic nerve activity c. increased cardiac output d. increased peripheral resistance e. none of the above