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...respiration? Dr Simon Collinson explains...We all know that air is essential for human life; more precisely, the oxygen in air is essential for life. A human breathes in approximately 11 000 litres of air every day. But how is that oxygen transported into and around our blood systems and stored in the parts of our body that need it to function? And are humans different to...

...the tiny green structures called chloroplasts. These give leaves their colour, and capture light energy from the Sun. What happens next is a complex chain of reactions that can be summarised very simply. Water and carbon dioxide are converted, using the sun's energy, into simple sugars. The oxygen released in the reaction is now available for other organisms to respire....

...respiration is so important for life, including how air enters and leaves the lungs, how oxygen is transported in the blood, the many dynamic factors that control breathing, and some diseases that affect respiration...‘Don’t hold your breath’ is an expression you’ve probably heard many times, but may not have thought too much about. In this free course, Blood and...

...circulation and how the oceans influence our climate...The oceans cover more than 70 per cent of our planet. In this free course, The oceans, you will learn about the depths of the oceans and the properties of the water that fills them, what drives the ocean circulation and how the oceans influence our climate....The oceans: Introduction - The oceans cover more than 70...

...circulation patterns. Atmospheric transport spreads volcanic outputs over wide areas. The climate change resulting from the atmospheric response to volcanic gases and aerosols is thought to have melted the ice in periods when Earth was deep-frozen and to have caused mass extinctions several times in the past. The atmosphere today is both a consequence of, and essential...