Chapter 9 - Study Points
- Created by: grtrice2005
- Created on: 01-03-22 17:37
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- Chapter 9
- Features of a transport system
- In an open blood system, the transport medium is moved into a large space in the body cavity, called the haemocoel. In a closed circulation system, the blood flows in blood vessels
- The greater the metabolic rate, the greater the need for rapid delivery of oxygen and glucose and removal of waste such as carbon dioxide
- The cardiac cycle
- The volume of blood expelled by the heart
- In one cycle is the stroke volume
- In on minute is the cardiac output
- The cardiac output = stroke volume x the number of heartbeats per minute
- Valves close when the blood pressure downstream is higher than the blood pressure upstream
- The volume of blood expelled by the heart
- Transport of oxygen
- When describing oxygen binding to haemoglobin, use the terms 'loading' or 'associating'. When oxygen unbinds from oxyhaemoglobin, use the terms 'unloading' or 'dissociating'
- At a given partial pressure of oxygen, when the partial pressure of carbon dioxide is higher, haemoglobin has a lower affinity for oxygen
- Transport of carbon dioxide
- Haemoglobin buffers the blood by removing hydrogen ions from solution, preventing the pH from falling
- Intercellular or tissue fluid
- Lymph is formed from excess tissue fluid
- Features of a transport system
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