Biology Definitions - Chapter 9 0.0 / 5 ? BiologyAdaptations for transport in animalsASWJEC Created by: grtrice2005Created on: 23-02-22 16:11 243156 Across 1. the degree to which two molecules are attracted to eachother (8) 4. the heartbeat is initiated in the muscle cells themselves, and not dependent on nervous or hormonal stimulation (8, 11) 5. the increasing ease with which haemoglobin binds its second and third oxygen molecules, as the conformation of the haemoglobin molecule changes (11, 7) 6. the only conducting tissue in the wall of the heart between the atria and ventricles, through which electrical excitation passes from the atria to the conducting tissue in the ventricles (5, 11, 4) Down 2. the movement of the oxygen dissociation curve to the right at a higher partial pressure of carbon dioxide, because at a given oxygen partial pressure, haemoglobin has a lower affinity for oxygen (4, 6) 3. an area of the heart muscle in the right atrium that initiates a wave of electrical excitation across the atria, to generate contraction of the heart muscle. It is also known as the pacemaker (4, 6, 4)
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