T HE HEART AND CIRCULATORY SYSTEM 1. All must be able to identify the organs in the circulatory system. (Level 3) 2. Most should be able to describe the heart and the main blood vessels and their role. (Level 4-5) 3. Some could describe the role of the ‘double pump.’ (Level 6) PowerPoint slides Fill in the gap sheets Labelling the heart Heart dissection Learning objectives: Learning activities:

ARTERIES Carry blood away from the heart. The blood in the arteries is under high pressure and so: Arteries have thick outer walls Arteries have thick layers of muscles and elastic fibres VEINS Carry blood to the heart. The blood in the veins is under low pressure and so: Veins have thin walls Veins have thin layers of muscle and elastic fibres.

Unlike arteries, veins have one-way valves in them to keep the blood moving in the correct direction.

Oxygenated blood - Blood that contains oxygen Mainly found in arteries Deoxygenated blood - Blood that does not contain oxygen Mainly found in veins e/heartdiseaserev2.shtml ase/heartdiseaserev3.shtml

The heart is a muscular pump that keeps blood moving.

1.Complete worksheet titled ‘The heart and the circulatory system.’ 2.Label the diagram of the heart TASK:

The heart is a DOUBLE PUMP: 1st - blood is pumped to the lungs & returns to the heart, 2nd - blood is pumped to respiring muscles & back to the heart again. 1. Deoxygenated blood is pumped from the heart to the lungs 2. The blood receives oxygen and is pumped back to the heart 4. The oxygen leaves the blood to be used for respiration in the body and the blood goes back to the heart 3. The oxygenated blood is then pumped to the rest of the body