<p>Can someone help me answer this questions?!? please!@</p>
<p>1) Explain why blood pressure and heart rate differ when measured in a reclining position and in a standing position.</p>
<p>2) Explain why an athlete must exercise harder or longer to achieve a maximum heart rate than a person who is not as physically fit.</p>
<p>ur pumping against gravity…?</p>
<p>2) because an athlete’s heart is normally conditioned to pump at a lower rate (stronger muscle) it doesn’t have to work very hard when increasing activity a small increment, so it would take a massive amount of activity to force it to its threshold…</p>
<p>1st one i don’t know</p>
<p>first one is because of gravity. when u stand up the heart has to work against force of gravity.</p>
<p>Cujoe got the second one.</p>
<p>First one:</p>
<p>Yes, you are pumping somewhat against gravity but also:</p>
<p>When you are standing you are using all the small muscles to actually stand. Muscles in your legs and feet are contracting in order to keep you in balance. These muscles need oxygen and thus your heart must pump faster. When reclining, the floor is keeping your body up and you are not using muscles to balance yourself. </p>
<p>Hope this helps…</p>
<p>Ladros</p>
<p>thanks@! it really helped!</p>
<p>isnt this one of the AP labs?</p>
<p>yup it is.</p>
<p>yup it is… lab #10… i guess u guys r smarter then me n thought it was easy? haha i HATE the teacher for bio she makes everything harder than it should be… i practically spend 20 hours a week just on bio, and like 2 hr / week on math and physics combined. sad.</p>