MadSci Network: Medicine

Re: The effects of exercise on the cardiovascular and respiratory systems

Date: Sat May 12 13:08:42 2001
Posted By: M. Salik Jahania, M.D., Suregry, Cardiothoracic, University of Kentucky
Area of science: Medicine
ID: 987589926.Me

Sorry for the late response.
The cardiovascular system responds to exercise by increasing the activity 
level. The adrenal gland increases the production of the hormones 
adrenaline and nor adrenaline. These have direct effects on the heart. 
These hormones cause an increase in the heart rate and the force with 
which the heart contracts each beat.

This increases the total amount of blood that is circulated in the body 
every minute. That increase in blood circulation is required to meet the 
increased demand for nitutrients and oxygen that the muscles and other 
tissure require during exercise or for that matter during any time that 
the metacbolic demand on the body is high.

The blood vessels in non essential places places in the body also 
constrict during exercise and this provides extra blood volume for more 
essential organs such as the heart lungs and the brain.

The lungs also play an important part in all of this. Their primary role 
is to exchange oxygen and carbon dioxide in the blood with fresh air./
This increases the amount of oxygen in the blood that comes to the lungs 
from the body and decreases the amount of carbondioxide in the blood.

The lungs also increase their activity by increasing the number of breaths 
taken each minute and the amount of air taken in each breath.

Together the increase in the activity of both these organ systems 
increases the amount of blood and oxygen supply to the body.


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