Syllabus Statements: 2.69 - 2.76 What do kidneys do? They're a very very important part of our bodies actually. Simply, they filter our blood and remove the waste products. These waste products are contained in urine.
Read more to learn about Osmoregulation, selective reabsorption and more!
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How does the heart work? A lot of people are confused about the heart and all its veins and arteries. What even are veins and arteries? Hopefully, this post will help you understand all this better. The Heart and it's chambersThe heart has 4 chambers with different functions. To visualise this let's get a diagram.
Click Read More to learn about the roles of the chambers,
how the blood flows through the circulatory system and the differences between arteries, veins and capillaries! syllabus statements 2.12 - 2.16 what the hell is diffusion? and isn't osmosis the same thing? what about active transport? and whats all this about a selectively permeable membrane? Diffusion is basically where particles space out really nicely and evenly, If there are a lot of particles clumped in the corner for example and not equally spread out, then they will naturally spread out and become even again, no energy needed at all. This is what diffusion is. When there are a lot of particles all together and not spread out, its called a HIGH CONCENTRATION GRADIENT because there is a HIGH CONCENTRATION of particles in that space. When there are hardly any particles there at all, its called a LOW CONCENTRATION GRADIENT, because there is a LOW CONCENTRATION of particles there. The rule with diffusion AND osmosis is that particles travel FROM a HIGH CONCENTRATION GRADIENT TO a LOW CONCENTRATION GRADIENT, they basically spread out. Read more for explanations on Osmosis and Active transport, as well as semi permeable membranes and experiments.
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