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How is the diffusion of gases between the alveoli and the alveolar blood vessels facilitated?

Alveoli are small sacs at the end of the terminal branches of the lung (the brochioles). It is at the alveoli where gas exchange takes place - oxygen moves into the blood and carbon dioxide is removed. The b...
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Answered by Katy C. • Biology tutor
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What is the difference between aerobic and anaerobic respiration?

Both aerobic and anaerobic respiration involve chemical reactions which take place in the cell to produce energy, which is needed for active processes. Aerobic respiration takes place in the mitochondria and...
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Answered by Katy C. • Science tutor
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Some videos I've made

Prerequisite for addition formula: https://www.youtube.com/watch?v=iHZmi2MHqWc Proof of formula for sin(A+B): https://www.youtube.com/watch?v=BEETggUVMrY Proof of formula for cos(A+B): https://www.youtube.co...
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Answered by Sam G. • Maths tutor
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What is homeostasis?

Homeostasis is defined as the maintenance of a constant internal environment in the body. An example of this would be the blood glucose level: After a meal, a person's blood glucose level would be high. This...
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Answered by Lauren S. • Biology tutor
5494 Views

How do I know how many roots a quadratic equation has?

Let ax 2 + bx + c = 0 be the equation in question where a,b,c are real numbers with a not equal to 0 (otherwise we would not have a quadratic). If: b 2 - 4ac > 0 then there are two (real) roots b 2 - 4ac ...
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Answered by Amit G. • Maths tutor
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