15. A 87-year-old man complains of shortness of breath, fever, and swelling of the lower limbs for 2 years. He props up pillows while sleeping. When he is disturbed in sleep, he does to window to get fresh air. He is diagnosed with left heart failure and is prescribed Digoxin. How does this medication bring about contractility of the cardiac myocyte? * A. Decreases Ca$^{2+}$ conductance B. Decreases Na$^+$ Conductance C. Increases K$^+$ conductance D. Inhibition of the sarcolemmal Na$^+$/K$^+$ ATPase
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Contractility refers to the ability of the cardiac muscle cells (myocytes) to contract and generate force. In other words, it is the strength of the heart's contractions. Now, let's analyze the options given: A. Decreases Ca++ conductance: Calcium ions (Ca++) Show more…
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