MCELLBI C61 Chapter Notes - Chapter 11: Open Set, Hair Cell, Compass
21 Mar 2020
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Document Summary
Sensory perception: the brain receives signal info from the environs of our body and uses that info to form a mental experience of the world. Sensation: collection of info from environment via sensory organs + receptors. Perception: analysis and interpretation of this info by the nervous system, contributing to the experience of mental states + perceptual awareness. Even very simple organisms have sensation, including e. coli and salmonella. Such bacteria swim in a series of maneuvers called runs and tumbles. Run: traveling straight when the agella rotate in one direction and form a bundle that functions like a propeller that produces a coherent motion. Tumble: flopping around when the direction of agellar rotation reverses, the individual agella y apart, forward motion ceases, and the bacterial cell tumbles about randomly. Mathematically termed a random walk in three dimensions. A bacterium encounters a nutrient amino acids interact w receptor membrane proteins the bacterium swims towards the nutrients (chemotaxis)
