The Heart 2.0 / 5 based on 1 rating ? ScienceASAQA Created by: kynaatCreated on: 26-12-12 13:18 4263715 Across 1. Lactic acid builds up in the muscles during exercise, this is called the... (6, 4) 4. Found between the left atrium and left ventricle. (8, 5) 5. One complete sequence of contraction and relaxation is called a... (7, 5) Down 2. Relaxation of the heart muscles is known as... (8) 3. What is the stimulus for the heart to increase it's speed of concentration?? (6, 7) 6. When the left ventricle contracts, blood flows into the... (5) 7. What blocks the coronary artery so blood cannot flow past?? (5, 8)
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