09 May 2013

#71 Effect of exercise on heartbeat and causes of coronary heart disease

A heartbeat is a contraction. Each contraction squeezes blood to the lungs and body. The heart beats about 70 times a minute, more if you are younger, and the rate becomes lower the fitter you are.

  • During exercise the heart rate increases to supply the muscles with more oxygen and glucose à allow the muscles to respire aerobically à they have sufficient energy to contract.
  • Regular exercise is important to keep the heart muscle in good tone à heart is more efficient in maintaining blood pressure andrisk of coronary heart disease and stroke. 

Coronary arteries

The muscles of the heart are so thick that the nutrients and oxygen in the blood inside the heart would not be able to diffuse to all the muscles quickly enough. The heart muscles needs a constant supply of nutrients so that it can keep contracting and relaxing. The coronary arteries supply this.

If a coronary artery gets blocked – e.g. by a blood clot – the cardiac muscles run short of oxygen  à they can not respire à can not obtain energy to contract à heart stops beating. This is called a heart attack or cardiac arrest.

Blockage of the coronary arteries is called coronary heart disease

Main causes of a coronary heart disease and preventive measures

(source: Health Line)
(not included in the syllabus) 


  1. maggie.danhakl@healthline.comApril 12, 2014 at 4:12 AM

    Hi Emma,

    Healthline recently put together an infograph showcasing heart disease statistics and facts to help someone understand their risk for a heart attack or other heart-related issues. You can see the infograhic here: http://www.healthline.com/health/heart-disease-infographic

    I am writing to you to see if you can help spread awareness about heart disease by sharing this with your followers or including it as a resource on your page: http://igbiologyy.blogspot.com/2013/05/70-effect-of-exercise-on-heartbeat-and.html

    Please let me know if you would be interested in helping to raise awareness about heart disease.

    Thank you for your time reviewing. Please let me know if there are any questions I can answer.

    Warm regards,
    Maggie Danhakl • Assistant Marketing Manager
    p: 415-281-3124 f: 415-281-3199

    Healthline • The Power of Intelligent Health
    660 Third Street, San Francisco, CA 94107
    www.healthline.com | @Healthline | @HealthlineCorp

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  2. Yeah you are right, our heart is a very important part of our body but we usually take it for granted. We have to do some efforts to maintain our heart by this you can not only live long life. But you can also live without any heart diseases . By the way, if you want more information about coronary heart diseases , you can come to this site.

  3. its important to know that Regular exercise is important to keep the heart muscle in good tone because heart is more efficient in maintaining blood pressure