what are t tubules made of?
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T-tubules are tubules formed from the same phospholipid bilayer as the surface membrane or sarcolemma of skeletal or cardiac muscle cells.
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Like Cilia and Flagella, Centrioles are also made of microtubules. The difference is that they contain 9 sets of triplets and no doublet in the center. How the triplets in the basal body turn into the cilium doublet remains a mystery. Centrioles come in pairs, each organized at right angles to the other.
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Calcium is stored in cells in a structure called the reticulum, a series of interconnected tubules and tiny sacs distributed throughout the cells.
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The renal tubules reabsorb useful substances (amino acids Page 2 glucose and certain ions) so that they can be shunted back into the bloodstream. They also actively secrete various substances, such as hydrogen ions, creatinine, and drug metabolites into the filtrate.
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Tygon® tubing is a registered trademark of thermoplastic (plastic material) tubing manufactured by Saint-Gobain Performance Plastic's. The tubing may be made of different plastic compounds composed of the following materials: silicone, PCV, polyurethane, fluoropolymers, thermoplastic elastomers and other materials.
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Microtubules are usually discussed with microfilaments. Although they are both proteins that help define cell structure and movement, they are very different molecules. While microfilaments are thin, microtubules are thick, strong spirals of thousands of subunits. Those subunits are made of the protein called tubulin.
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Within the testes are coiled masses of tubes called seminiferous tubules. These tubules are responsible for producing the sperm cells through a process called spermatogenesis.
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There are three types of molecules used to build the cell: Proteins, carbohydrates and: lipids. Starch, cellulose, glycogen, and polypeptides are all made from chains of many sub-units, or building blocks.
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Although smooth muscle contraction relies on the presence of Ca++ ions, smooth muscle fibers have a much smaller diameter than skeletal muscle cells. T-tubules are not required to reach the interior of the cell and therefore not necessary to transmit an action potential deep into the fiber.
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The cytoskeleton of a cell is made up of microtubules, actin filaments, and intermediate filaments. These structures give the cell its shape and help organize the cell's parts. In addition, they provide a basis for movement and cell division.
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Stems and bits of tobacco pipes are usually made of moldable materials like Ebonite, Lucite, Bakelite, and soft plastic. Less common are stems made of reeds, bamboo, or hollowed out pieces of wood. Expensive pipes once had stems made of amber, though this is rare now.
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['Grana is made up of stacks of disc-shaped structures known as thylakoids. ... ', 'Stroma is the homogenous matrix which contains grana and is similar to the cytoplasm in cells in which all the organelles are embedded.']
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The jelly-like fluid that fills a cell is called cytoplasm. It is made up of mostly water and salt. Cytoplasm is present within the cell membrane of all cell types and contains all organelles and cell parts. Cytoplasm is responsible for giving a cell its shape. ...
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Microfilaments are polymers of the protein actin and are 7 nm in diameter. Microtubules are composed of tubulin and are 25 nm in diameter. Intermediate filaments are composed of various proteins, depending on the type of cell in which they are found; they are normally 8-12 nm in diameter.
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Inside the muscle fibre, the T-tubules lie next to the terminal cisternae of an internal membrane system derived from the endoplasmic reticulum, called the sarcoplasmic reticulum (SR), which is a store of calcium ions.
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['Tracheids: Tracheids are elongated tube-like structures. ... ', 'Vessels: Vessels are cylinder-like structures made of many cells called vessel members. ... ', 'Xylem Fibres: ... ', 'Xylem Parenchyma:']
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The cytoplasm is made up of the cytosol and insoluble suspended particles. The cytosol refers to the water and anything that is soluble and dissolved in it such as ions and soluble proteins. The insoluble suspended particles could be things like ribosomes. Together, they make up the cytoplasm.