πŸ’ Heart Structure and Function


Heart structure

Types of circulation Electrical impulses and The sequences of events in heart contraction

Cardiac output = heart rate x stroke volume

Interpreting heart function data

The P wave and the T wave

Arrythmias

First-aid treatment of hearts attack and cardiac arrest


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In my quest to find a suitable diagram for the heart, this is what I found:

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Definitely use your textbook as a guide on this. It only takes a google search to realise the ridiculous number of variations of diagrams for the heart and different annotations. You need to be able to sketch a heart and label the main veins, valves, arteries and aorta, and the ventricles and atria.

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There are two types of circulation going on via the heart: pulmonary circulation and systemic circulation. Pulmonary circulation is a short-distance route between the heart and the lungs, where deoxygenated blood is taken to be replenished with oxygen. Although normally veins take blood away, and arteries take blood to, in the case of pulmonary circulation things are the opposite way around. The pulmonary vein brings freshly oxygenated blood into the heart – left atrium -, while the pulmonary artery takes deoxygented blood back fromΒ the right ventricle into the lungs.

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Here’s a quick nifty video that shows what happens as the bigger picture:

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The advantages of double circulation in mammals as opposed to single circulation (such as in bony fish) include the option to have a higher blood pressure and……