Select the correct statement about the physical factors influencing pulmonary ventilation.
A) A decrease in compliance causes an increase in ventilation.
B) A lung that is less elastic will require less muscle action to perform adequate ventilation.
C) As alveolar surface tension increases, additional muscle action will be required.
D) Surfactant helps increase alveolar surface tension.
C) As alveolar surface tension increases, additional muscle action will be required.
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Why is blockage of a coronary artery such a serious threat to cardiac muscle?
A. Cardiocytes have weak sarcolemmas that easily rupture. B. Cardiocytes have abundant mitochondria and rely on a constant supply of oxygen. C. Cardiocytes rely on a constant supply of calcium. D. The myosin of cardiocytes is unique and requires abundant nutrients and oxygen. E. Cardiocytes are fast-twitch fibers.
Which of the labeled structures are found in DNA but not RNA?
1 A 2 B 3 C 4 E a) 1 only b) 2 only c) 3 only d) 4 only e) 1 and 4
In the presence of light, photoreceptors __________.
Fill in the blank(s) with the appropriate word(s).
The nuclear envelope is perforated with openings called nuclear ________________ that regular the movement of molecules through the envelope.
Fill in the blank(s) with the appropriate word(s).