Friday, 22 February 2013

2.63 describe the structure of the heart and how it functions

The heart can be thought of in four sections: the right atrium; the right ventricle; the left atrium; the left ventricle. A description of the workings of the heart:
The right atrium fills with blood (from the vena cava) and the valve is closed; This area is squeezed forcing the blood through an atrio-ventricular valve into the right ventricle; This area contracts forcing the blood through the pulmonary artery where it is oxygenated at the lungs; the pulmonary vein fills the left atrium with blood; This contracts forcing the blood into the left ventricle; when the left ventricle contracts the blood is forced out through the aorta.

Things to remember:
Veins lead to the heart; arteries lead away.
Atrium means entrance hall in Latin; hence the atrium is where blood enters the heart.
The left side is bigger than the right as it has to pump blood through the whole body.
You talk about the heart from right to left, as if you were examining someone's heart and using their own left and right.

12 comments:

  1. typo:
    heart, not hear (last sentence)
    thanks for the amazing blog!

    ReplyDelete
  2. As an addition- after its squeezed from the aorta it goes to all the other parts of the body and it comes back deoxygenated, the process repeats when it returns to the heart and the oxygen goes out of the heart via the pulmonary artery to the lungs for it to become oxygenised again to repeat the process.

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  3. Will you be doing A level Chemistry?

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  4. This comment has been removed by the author.

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  6. The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  7. more at

    http://igcse-biology-notes.blogspot.hk/2017/06/263-describe-structure-of-heart-and-how.html

    ReplyDelete