The Heart

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

The Heart
Note that the heart is seen from the front in the diagram. So the right side of the heart is shown on the left of the diagram. The left side is on the right side of the diagram.
The heart is a muscular pump. When it beats it pumps blood to the lungs and around the body.
The heart has four chambers. The two atria collect the blood. The two ventricles pump the blood out of the heart.
Valves prevent the blood from flowing backwards. The septum separates the two sides of the heart.
The right side of the heart pumps de-oxygenated blood (blood not containing oxygen) to the lungs to pick up oxygen. The left side of the heart pumps the oxygenated blood from the lungs around the rest of the body.

Heart Dissection
Demonstration of a heart dissection including external and internal features, the four main vessels connecting to the heart, and an explanation of the blood pathway.

Heart Model
Using a model of the heart to describe the different parts of the heart.

What Happens to your Heart when you Exercise?
During exercise, the muscle cells respire more than they do at rest. This means that oxygen and glucose must be delivered to them more quickly and waste carbon dioxide must be removed more quickly. This is achieved by increasing the heart rate, rate of breathing and the depth of breathing. The increased heart rate increases the rate of blood flow around the body. The increased rate and depth of breathing increases the rate of gaseous exchange in the lungs.

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