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Gas Exchange

2. Transporting Oxygen and Carbon Dioxide

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About this Lecture

Lecture

In the second mini-lecture, we learn how oxygen and carbon dioxide are transported in the blood. We learn about the protein vital for this transport, known as haemoglobin. As an allosteric protein, it has various adaptations that allow it to maintain a high affinity for oxygen and carbon dioxide in areas where they are abundant. We display the effect of these adaptations by looking at oxy-haemoglobin dissociation curves, and explain why the sigmoidal relationship of oxygen partial pressure with haemoglobin saturation is beneficial. We then move onto the blood buffer system, and the reasons how and why blood is maintained at a specific pH.

Course

In this lecture, Dr Helen Wallace (University of Liverpool) teaches us about the microscopic structures in our lungs and blood that allow for the exchange and transport of the two gases involved in respiration: oxygen and carbon dioxide. To do so, we: (i) introduce the alveoli and capillaries as the exchange surfaces that allow for oxygen and carbon dioxide to be exchanged, using Dalton’s Law to explain how diffusion is maintained in the desired direction, before then (ii) appreciating how oxygen and carbon dioxide are then transported in the lungs by haemoglobin.

Lecturer

Dr Helen Wallace is a senior lecturer in Women's and Children's Health at the University of Liverpool. Her primaryprimary interests focus on all aspects of physiology education, from A level students, undergraduates and postgraduates, to healthcare professionals. She has contributed to many physiology text books, and in addition to this she is the Programme Director of MRes in Clinical Studies, the Physiology Course Lead for the MBChB programme, the Respiratory System Science Lead for the MBChB programme, and Education Lead for the Institute of Life Course and Medical Sciences.

Cite this Lecture

APA style

Wallace, H. (2022, August 30). Gas Exchange - Transporting Oxygen and Carbon Dioxide [Video]. MASSOLIT. https://massolit.io/courses/gas-exchange/transporting-oxygen-and-carbon-dioxide

MLA style

Wallace, H. "Gas Exchange – Transporting Oxygen and Carbon Dioxide." MASSOLIT, uploaded by MASSOLIT, 30 Aug 2022, https://massolit.io/courses/gas-exchange/transporting-oxygen-and-carbon-dioxide

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