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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 S...

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...

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 sat...

The heart is the muscle responsible for pumping blood around the body. It has four chambers: an atrium and ventricle on the left, and an atrium and ventricle on the right. Atrioventricular and semilunar v...

Large surface area: Branches off, starting with bronchioles until microscopic in size with air filled sacs called alveoli. The alveoli also have massive capiliary networks surrounding them so there is a b...