Communication and homeostasis 5.0 / 5 based on 1 ratingTeacher recommended ? BiologyCommunication and homeostasisA2/A-levelOCR Created by: princess-kenwayCreated on: 07-06-15 12:52 4312 Across 1. What do alpha cells secrete? (8) Down 2. What does the adrenal medulla manufacture? (10) 3. What do beta cells secrete? (8) 4. Where do the ionic exchanges that cause an action potential occur? (3, 5, 2, 7)
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