After jogging with your friend for about 30 minutes, she stops and asks why your heart rate increases and your heart feels like it is pumping harder after you exercise for a while. Based on your understanding of the cardiovascular system, your best response would be which of the following statements?
a. You're out of shape. Those things wouldn't happen if you exercised more.
b. Exercise makes your body need more nutrients and oxygen; your heart pumps harder and faster to deliver more blood containing those things to your muscles.
c. When you exercise, your blood pressure increases, so your heart has to work harder to overcome the higher blood pressure.
d. Exercise pushes more blood into your heart, so your heart has to work harder and faster to pump the blood out so you don't go into heart failure.
Question 2
You are assessing a 38-year-old woman who is complaining of the sudden onset of chest pain and dyspnea. She describes the pain as sharp and states that it increases when she takes a deep breath. You note that she is tachypneic. Her BP is 130/82 and her pulse is 100. Based on her presentation, you suspect that she may have:
a. pulmonary embolism.
b. pericardial effusion.
c. unstable angina.
d. an aortic dissection/aneurysm.
Summation of Heart Sounds, Normal S1
Summation of Heart Sounds, Loud S1
For this bimolecular reaction, the rate constant k is second order
anatomy of the heart
Anatomy of Heart
A Change of Heart