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Plants, like us, need food and water to survive. We have a heart, arteries and veins that help us circulate our blood around. But plants don't have that, and need ways of transporting water and food, which t...

Key Points: 1) Active transport requires energy in the form of ATP whereas facilitated diffusion does not require energy; it is a passive process 2) Active transport can move molecules against their concentr...

The cardiac cycle is driven by the myocytes in the heart, which are a special type of muscle tissue which are able to contract without input from the nervous system. This starts with a tissue called the Sino...

The light-dependent reactions of photosynthesis occur in the thylakoid membrane of the chloroplast in a plant cell. Embedded in this membrane are two chlorophyll-protein complexes called photosystem 1 and ph...

Unsaturated fatty acids have double bonds between carbons which means they can accept hydrogen when this bond is broken. Saturated fatty acids lack these double bonds and so the fatty acid molecule is satura...