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First of all we have to understand that there are concentration gradients between cells and the outside. A higher concentration of solute is when there is more solute (eg salt) dissolved in the solvent (e.g water)- so 10g of salt dissolved in 50ml of water is more concentrated than 5g of salt dissolved in 50ml of water.
Osmosis is the diffusion of water molecules, down the concentration gradient, through a partially permeable membrane. The water moves fro the area of high concentration of water to low concentration water.
Active transport is the movement of solutes from an area of low concentration to high concentratio so against the concentration gradient. It may help to consider this as the opposite to osmosis. Because you are going against the gradient active transport requires a pump or carrier protein in the cell membrane and therefore energy (made through respiration).see more
In the double circulation system there are two routes that the blood can take:
1. Through the lungs
2. To the rest of the body
The blood starting in the heart has no oxygen in it. It flows from the heart and goes through the lungs, this is where it picks up the oxygen. The blood returns to the heart where it is redirected to go on the second route. This oxygenated blood is now delivered around the rest of the body via arteries, once the oxygen has been dropped off at the muscles (which need it for respiration) it returns to the heart deoxygenated via the veins.
Then the cycle repeats itself.see more