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The epithelial cells in the lungs are arranged into alveoli. Explain how the alveoli create a surface for efficient gaseous exchange.

Alveoli are made of two main types of cells. The alveoli walls are made of a single layer of squamous alveolar cells (aka Type I cells ), which are flat and thin, further shortening the diffusion distance. A...
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Answered by Yasamin M. • Biology tutor
5530 Views

What is the affect of expansionary fiscal policy on the economy?

Expansionary fiscal policy is the increase of government expenditure and/or the reduction of taxation. Government expenditure is an injection into the circular flow of income, whereas taxation is a leakage. ...
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Answered by Jac M. • Economics tutor
5263 Views

What are some advantages and disadvantages of using observations as a research method?

Observations as a research method requires the researcher to watch subjects in a natural or artificial setting and record their behaviour. One advantage of naturalistic observations is that they take place i...
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Answered by Rachel B. • Psychology tutor
27735 Views

How do you find the components of a vector?

Sometimes it is more useful for us to represent a vector in terms of other vectors added together. For example, we can split a vector into the vectors pointing in the direction of our axes, we call these sep...
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Answered by Andrew S. • Physics tutor
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An alpha particle is accelerated with 5MeV of kinetic energy towards the nucleus of a gold atom with atomic number 79. What is the distance of closest approach that is reached by the alpha particle?

45 femtometers to two significant figures
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Answered by Joshua M. • Physics tutor
2876 Views