OCR 21st Century Biology B7 3.5 / 5 based on 3 ratings ? BiologyGCSEOCR Created by: Christabel AcquahCreated on: 16-06-13 20:30 10853629714 Across 1. when blood vessels in the skin constrict (15) 4. tissue that contracts and relaxes (6) 5. blood temperature is monitored by a centre in your brain called the.. (12) 10. the science of working with extremely small structures (14) Down 2. the smaller, less muscular upper chambers that receive blood coming back to the heart from the veins (6) 3. cells that are completely unspecialised (4, 5) 6. when blood vessels in the skin dilate (12) 7. rigid tissues that make up the skeleton (5) 8. tough, fibrous, elastic connective tissues that connect muscle to bone or bone to muscle (7) 9. animals with an internal skeleton (11)
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