Travis is taking a long run, and his muscle tissue needs more oxygen. He is breathing heavily and taking in a lot of oxygen. How
does this exercise affect circulation?

A. Travis's heart pumps more quickly to allow oxygen to be removed from the air and transported to the tissue.

B. Travis's heart pumps more slowly to give the blood cells time to pick up the oxygen and drop it off at the tissues.

C. Travis's coronary arteries become blocked, so blood travels to other muscles, where it is necessary.

D. Travis's heart starts angiogenesis so that he has more vessels to transport blood to the tissues.

An 80-year-old woman comes to the urgent care clinic with dyspnoea on exertion. on physical examination, her blood pressure is 100/70, and her pulse is 75. she has no pulsus paradoxus. her jugular veins are distended, and she has distant heart sounds. in addition, she has extra third and fourth heart sounds. her liver is enlarged, and she has pedal oedema. she has occasional premature ventricular contractions on her electrocardiogram. a chest x-ray reveals clear lung fields with a dilated cardiac silhouette. her echocardiogram reveals ventricular walls with a "speckled pattern". which of the following is the most likely diagnosis? - alcoholic cardiomyopathy- amyloidosis- haemochromatosis- tuberculosis- viral myocarditis