Which membrane protein transport process plays an important role in terminating the contraction of cardiac muscle?
A. Ca 2+-ATPase pumps move Ca2+ from the T-tubule back into the sarcoplasmic reticulum.
B. Na+/K+-ATPase pumps move Na+ back into the cytosol and K+ back into the T-tubule lumen.
C. Ca2+-ATPase pumps move Ca2+ from the cytosol back into the sarcoplasmic reticulum.
D. Na+/Ca2+-exchangers move Na+ out of the cytosol in exchange for Ca2+ movement into the sarcoplasmic reticulum.
E. Na+/K+-ATPase pumps move Na+ and K+ back out of the cell.
C
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The human immunodeficiency virus (HIV) targets CD2 cells.
Answer the following statement true (T) or false (F)
Upregulation of a target cell can occur in response to
A) prolonged increase in the level of a hormone. B) signals from antagonistic hormone products. C) prolonged decrease in the level of a hormone. D) signals from the posterior pituitary.
A patient is admitted to the hospital because of hypoxemia. On ambient air the patient's PaO2 is 50 mm Hg with an oxygen saturation of 82%
While breathing 100% oxygen through a non-rebreathing mask, his PaO2 is 83 mm Hg with an oxygen saturation of 92%. The cause of this man's hypoxemia is most likely: A. a physiological shunt B. low C. hypoventilation D. decreased inspired oxygen
Which protein makes up the thick filaments?
A. Actin B. Tropomyosin C. Myopathy D. Myosin E. Troponin