View 3 Hour Detailed Portland Weather Forecast for Today. Portland 4 â 7 Day Weather Forecast Summary: Heavy rain (total 37mm), heaviest during Mon afternoon. Warm (max 24Â°C on Mon afternoon, min 14Â°C on Tue night). Winds decreasing (fresh winds from the SSE on Sun night, light winds from the N by Mon afternoon).
noun, plural: spindles. (1) A collection of minute fibers composed of microtubules, which are prominent during cell division, as mitotic spindle or mitotic apparatus''. (2) A specialized innervated muscle structure involved in the reflex action and in proprioception, as muscle spindle. (3) A species of a poisonous shrub or small tree of the genus Euonymus, originally used for making spindles used for spinning wool. (4) An EEG waveform that occurs during sleep, as sleep spindle.
Spindle fibers are a part of the spindle apparatus, which moves chromosomes during mitosis and meiosis to ensure each daughter cell gets the correct number of chromosomes. The spindle apparatus consists of spindle fibers, motor proteins, chromosomes, and in some cells, structures called asters. In animal cells, spindle fibers are produced from cylindrical microtubules called centrioles. Centrioles form asters and asters generate spindle fibers during the cell cycle. Centrioles are located in a region of the cell known as the centrosome. Spindle Fibers and Chromosome Movement