Sclerenchyma cells provide protective, vascular and supportive functions, according to the McGraw-Hill Higher Education. They have fibers and sclereids, which are responsible for the protective and supportive functions.Know More
Vascular tissues of plants consist of phloem and xylem, says the McGraw-Hill Higher Education. Phloem cells blend in with parenchyma, while xylem cells stand out as sclerenchyma cell types. They are usually found next to each other in vascular tissues. Most sclerenchyma cells die at maturity and thus lack nuclei.
Mature sclerenchyma cells contain secondary cell walls that are thick with cellulose and typically impregnated with lignin, explains the University of the Western Cape. Sclerenchyma is elastic, with a very small cell cavity. The main function of sclerenchyma is supporting tissue in plants. Sclereids are responsible for the shells of walnuts and the hardness of date seeds. Their cells have an irregular shape, and their cell walls are thick and hard. The cell walls contain simple pits or canals, which link adjacent cells. Fibers help transport water in the plant and young; living fibers store starch granules. Fiber cells are characterized by a needle shape, pointed tips, small lumen and thick walls. Vascular tissue of flowering plants contain plenty of fibers, whereas sclereids are often found in fruits and seeds.Learn more about Cells
Companion cells are parenchymal cells found within the phloem of flowering plants that manage the flow of nutrients through sieve tubes. Companion cells deliver ATP, proteins and other nutrients to sieve elements. This is due to the cytoplasm of sieve tubes lacking typical cell maintenance structures.Full Answer >
Schwann cells are the principle glia, which are neuron supports, in the peripheral nervous system. Schwann cells make up what is called the myelin sheath around the axon of the neuron. The function of this sheath is to protect and direct the nerve impulses.Full Answer >
The function of transitional epithelium cells is to protect the urinary system against the toxic effects of urine. Additionally, transitional epithelium cells stretch to accommodate the volume of the bladder and other organs when they fill with liquid.Full Answer >
The function of ciliated epithelial cells is to move secretions and foreign bodies away with a certain direction of rapid, wave-like motions from the hair-like structures that cover their free surfaces, according to MicrobiologyBytes. These hair-like structures are called cilia.Full Answer >