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It is referred to as the mitotic spindle during mitosis, a process that produces genetically identical daughter cells, or the meiotic spindle during meiosis, a process that produces gametes with half the number of chromosomes of the parent cell. Besides chromosomes, the spindle apparatus is composed of hundreds of proteins.
It is widely accepted that the kMTs fiber (the bundle of microtubules bound to the kinetochore) is originated by the capture of MTs polymerized at the centrosomes and spindle poles in mammalian cultured cells. [43] However, MTs directly polymerized at kinetochores might also contribute significantly. [55]
A spindle is a straight spike, usually made from wood, used for spinning, [1] twisting fibers such as wool, flax, hemp, and cotton into yarn. It is often weighted at either the bottom, middle, or top, commonly by a disc or spherical object called a whorl ; [ 1 ] many spindles, however, are weighted simply by thickening their shape towards the ...
When a muscle is stretched, primary type Ia sensory fibers of the muscle spindle respond to both changes in muscle length and velocity and transmit this activity to the spinal cord in the form of changes in the rate of action potentials. Likewise, secondary type II sensory fibers respond to muscle length changes (but with a smaller velocity ...
Common spindle and other species of shrubs and trees in genus Euonymus whose hard wood was used to make spindles; Spindle apparatus or mitotic spindle, a cellular structure in cell biology; Muscle spindle, stretch receptors within the body of a muscle; Spindle neuron, a specific class of neuron
Astral microtubules anchor the spindle poles to the cell membrane. Microtubule polymerization is nucleated at the microtubule organizing center . An aster is a cellular structure shaped like a star , consisting of a centrosome and its associated microtubules during the early stages of mitosis in an animal cell.
A few popular fibers that are spun into yarn other than cotton, which is the most popular, are viscose (the most common form of rayon), animal fibers such as wool, and synthetic polyester. [1] Originally done by hand using a spindle whorl, starting in the 500s AD the spinning wheel became the
A muscle spindle, with γ motor and Ia sensory fibers. A type Ia sensory fiber, or a primary afferent fiber, is a type of afferent nerve fiber. [1] It is the sensory fiber of a stretch receptor called the muscle spindle found in muscles, which constantly monitors the rate at which a muscle stretch changes.