Buffon

George-Louis Leclerc, Comte de Buffon was a French naturalist during the period of the French Enlightenment. He studied at a Jesuit school where he showed a proficiency for mathematics. He is also considered one of the founders of Paleontology. Buffon was skeptical of the classification system of Linnaeus, the famous naturalist. He particularly disagreed with … Continue reading Buffon

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Essay 14: On Hormones Involved in Hunger and Satiety

The feelings of hunger and satiety are the direct result of hormones and cell-signalling. There are four major hormones involved appetite: insulin, leptin, ghrelin, and PYY. Insulin suppresses appetite, and is released by the pancreas when the blood sugar reaches a certain threshold. Leptin also suppresses appetite, but is released by fat tissue. The burning … Continue reading Essay 14: On Hormones Involved in Hunger and Satiety

Essay 11: On Important Chordate Body Structures

Multicellular organisms, especially chordates (most vertebrates), exhibit several different body structures which allow for more sophisticated locomotion, sensory perception, and structure than in less developed animals. All chordates exhibit a notochord, which is a long, flexible rod that provides support, and a place for muscles push against in locomotion. The notochord is present in the … Continue reading Essay 11: On Important Chordate Body Structures

Essay 10: On Sugar from Source to Sink through the Phloem

Sugar flows from source to sink in plants through a vital network of specialized tubes. There are sugar sources which also act as sinks, and sinks which act as sources. A sugar source is anything that produces more sugar than it uses. Generally, the biggest sugar source in plants are the leaves, which convert water, … Continue reading Essay 10: On Sugar from Source to Sink through the Phloem

Essay 8: On the Importance of Light in the Calvin Cycle

There are two processes involved in photosynthesis, which are the light-dependent reactions, and the light-independent reactions. Despite its name, however, the light-independent reactions are in fact indirectly dependent on light. As their name implies, the light-dependent reactions are dependent on light. Basically,  light strikes a light harvesting complex which releases an electron. This electron is … Continue reading Essay 8: On the Importance of Light in the Calvin Cycle