Biology - HELP!

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1

<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>

2

<ol>
<li><p>In a reclined position, all the organs and their arteries are level with the heart, reducing the pull of gravity.</p></li>
<li><p>A person physically unfit tires sooner b/c his body isn’t accustomed to the excercise.</p></li>
</ol>