Biology- B2 Part B 0.0 / 5 ? BiologyCell OrganisationGCSEAQA Created by: 13clarkenCreated on: 18-03-18 11:50 3587941106 Across 1. Resting heart rate is controlled by a … in a group of cells in right atrium wall which produces small electrical impulses (9) 6. ?= Volume of blood/Number of minutes (4, 2, 5, 4) 8. Thin outer wall, wide lumen and have valves, thin inner layer of muscle and elastic fibres (4) 9. Lungs are protected by the ... (4) 10. These reduce cholesterol in the blood, and are drugs which decrease the amount of bad cholesterol, they reduce the risk of heart attacks (7) Down 1. They help blood clot, have no nucleus, clot a wound and stop microorganisms getting in (9) 3. They defend against infection, have a nucleus and produce antibodies and antitoxins to fight microorganisms (5, 5, 5) 4. This carries everything in the blood (6) 5. This is cause when fatty material blocks the arteries an blood flow is restricted so oxygen isn't delivered (5, 6) 7. … arteries surround the heart and come off the aorta, which gives the heart oxygenated blood (8)
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