Cardiac Output

Debate and discussion of any biological questions not pertaining to a particular topic.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
rave264
Garter
Garter
Posts: 2
Joined: Sat Sep 17, 2005 6:03 am
Contact:

Cardiac Output

Post by rave264 » Tue Sep 20, 2005 3:27 am

my teacher gave us this question, and we answered it in class, but i still don't understand it.here's it:

using this formular, explain why marathon runners have a significant heart rate? Cardiac Output = (heart rate)(stroke volume)

User avatar
rosebud
Garter
Garter
Posts: 22
Joined: Sun Sep 18, 2005 1:33 pm

Post by rosebud » Tue Sep 20, 2005 9:18 am

Cardiac output is a measure of the blood flow through the heart to the systematic and pulmonary circulation.

Heart rate is the number of beats per minute.

Stroke volume is the amount of blood pumped out of one ventricle of the heart as a result of a contraction.

Using this formula you would be able to calculated the the heart rate for a marathon runner. Marathon runners need more oxygen to keep going and so they are said to have larger hearts on the left side. This could cause a significant heart rate.

Hope it helps
:D

User avatar
mith
Inland Taipan
Inland Taipan
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN
Contact:

Post by mith » Tue Sep 20, 2005 12:19 pm

Actually, runners have a much lower heart rate because their hearts are stronger, more blood is pumped per stroke and their lungs are very efficient...ever notice how they don't really breath that hard?
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

User avatar
rosebud
Garter
Garter
Posts: 22
Joined: Sun Sep 18, 2005 1:33 pm

Post by rosebud » Tue Sep 20, 2005 3:31 pm

sorry

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Tue Sep 20, 2005 7:28 pm

Lance Armstrong's heart only beats 40 times a second :D And his heart IS 30% LARGER!!!
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

User avatar
victor
King Cobra
King Cobra
Posts: 2668
Joined: Sat Apr 30, 2005 12:01 pm
Location: Yogyakarta, Indonesia..
Contact:

Post by victor » Wed Sep 21, 2005 11:48 am

Hey, seeing the title reminds me of pattern that Brian gave me in counting cardiac output.
Vol. O2 = Q (Vp-Ap)
Q = cardiac output
Vp = pulmonary vein
Ap = pulmonary arthery
Q: Why are chemists great for solving problems?
A: They have all the solutions.

rave264
Garter
Garter
Posts: 2
Joined: Sat Sep 17, 2005 6:03 am
Contact:

Post by rave264 » Wed Sep 21, 2005 2:17 pm

thanks a lot guys. that helps. :D
biology is my fav subject

Post Reply

Who is online

Users browsing this forum: hojoborolo14fs, jamesgatesons and 15 guests