The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "D"?
A. major site of ATP synthesis when oxygen is available
B. contains digestive enzymes
C. outer boundary of cell, controls entry and exit of substances
D. directs cellular activities, contains DNA
E. site of protein synthesis
D
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Myofibrils are composed primarily of
A) fascia and tendons. B) troponin and tropomyosin. C) actin and myosin. D) perimysium and endomysium.
The free edges of the atrioventricular valves are attached to fibers called ____________________.
chordae tendineae liberated fibers pectinate muscles papillary muscles trabecula carnae
Where are sound vibrations amplified?
A) tympanic membrane B) auditory ossicles C) semicircular canals D) vestibule
Which of the following occur with emphysema?
A. Membranes form within alveoli, increasing surface area. B. Tar from cigarettes blackens alveoli. C. The walls of the alveoli degenerate, decreasing the surface area for gas exchange. D. Cells in the bronchial lining divide too fast, causing increased thickness of the bronchial lining.