Transport in animals - definitions

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• 2. The blood moves through the heart once in its passage around the body. (6, 11)
• 3. The increasing ease with which haemoglobin binds its second and third oxygen molecules, as the conformation of the haemoglobin molecule changes. (11, 7)
• 4. 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)
• 5. The degree to which two molecules are attracted to each other. (8)
• 6. An area of the heart muscle in the right atrium that initiates a wave of electrical excitation across the atria. (4, 6, 4)
• 7. The blood passes through the heart twice in its circuit around the body. (6, 11)