Biology- Heart rate and adrenaline Questions about the heart rate and how it changes. 3.0 / 5 based on 1 rating ? BiologyCirculationGCSEEdexcel Created by: tasha_0803Created on: 16-01-15 18:21 Why do muscles need oxygen during excercise? They respire aerobically and need the oxygen to release energy. 1 of 8 What does aerobic respiration in humans also produce? Carbon dioxide. 2 of 8 Carbon dioxide levels are picked up by what? Receptors in the aorta and carotid artery. 3 of 8 Where do these receptors send signals to? The brain. 4 of 8 Why does heart rate increase? To carry the blood to the lungs quickly to get rid of the dangerous carbon dioxide. 5 of 8 Why does the oxygen supply to the muscles need to increase when you are threatened? The muscles need to prepare for a "fight or flight" motion. 6 of 8 Adrenaline is released from where? The adrenal glands. 7 of 8 Adrenaline binds to specific receptors in the heart and causes what? The heart to contract faster to speed up the blood supply to different muscles. 8 of 8
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