ISCI 1A24 Lecture Notes - Lecture 12: Cephalopod Beak, Endoplasmic Reticulum, Nuclear Membrane
29 Sep 2016
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Document Summary
Giant squid largest (up to 60 ft) invertebrate known; kraken not seen alive until this year. Main predator = sperm whale; have scars from trying to capture squids. Different from octopi (8 arms, 2 longer tentacles), but both are cephalopods; Largest cephalopod beak of any invertebrate; largest eye of any known living organism (diameter = 25 cm) Slower than humble squid, which can porpoise out of water (can go 24 km/h) Squids have almost largest-known nerve cells (2 giant axons, diameter of spaghetti); much quicker reaction speed than most organisms. Intro to modern cell organelle structures and functions. Visualizing cell architecture is a function of light and resolution. Purpose to magnify and resolve small objects; nature of image depends upon type of microscope and sample preparation. Resolution ability to distinguish between 2 objects in close proximity (more important than magnification: no point in seeing something larger if it"s blurry)
