Top answers

How is the structure of alveoli in the lungs optimised for gas exchange?

Alveoli are microscopic air sacs in the lungs. During inspiration (breathing in), oxygen diffuses from the air in the alveoli into the blood. At the same time, carbon dioxide carried in the blood diffuses ou...
RF
Answered by Robert F. • Biology tutor
6685 Views

By use of matrices uniquely solve the following system of equations, justifying each step of the calculation: 3x-7y=6, 5y-2x=-3.

The first thing observe is that we are being asked to use a specific approach in order to solve for both x and y , hence we should not approach this question via elimination of a single variable, though it i...
KM
3941 Views

What is energy

Simply put energy is the thing that makes matter move, or has the ability to make matter move.
AG
Answered by Andrew G. • Physics tutor
2101 Views

What is entropy

Energy that cannot do work, often compared to the disorder of a system. Total entropy can never decrease.
AG
Answered by Andrew G. • Chemistry tutor
2667 Views

What is electricity

A transfer of energy via a current
AG
Answered by Andrew G. • Physics tutor
2950 Views