Cytoskeletal filaments provide the basis for cell movement. For instance, cilia and (eukaryotic) flagella move as a result of microtubules sliding along each other. In fact, cross sections of these tail-like cellular extensions show organized arrays of microtubules.
The cytoskeleton of eukaryotic cells is made of filamentous proteins, and it provides mechanical support to the cell and its cytoplasmic constituents. All cytoskeletons consist of three major classes of elements that differ in size and in protein composition.
Microtubules are the largest type of filament, with a diameter of about 25 nanometers (nm), and they are composed of a protein called tubulin. Actin filaments are the smallest type, with a diameter of only about 6 nm, and they are made of a protein called actin. Intermediate filaments, as their name suggests, are mid-sized, with a diameter of about 10 nm. Unlike actin filaments and microtubules, intermediate filaments are constructed from a number of different subunit proteins.
The cytoskeleton is a structure that helps cells maintain their shape and internal organization, and it also provides mechanical support that enables cells to carry out essential functions like division and movement.
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Answer:
Atoms make up every substance around you.
You cannot see single atoms without a special microscope. But every substance around you is made of atoms.
Explanation:
Answer:
Parasympathetic and Sympathetic branches of the autonomic nervous system
Jenna and Allen are both correct. Homeostasis refers to certain processes that take place to keep the body in normal or stable state. Maintaining the body temperature at normal measurement is an example of homeostasis, as well as increasing breathing rate when exercising. Breathing and heart rate is increased to deliver oxygen and glucose to the body more quickly and remove carbon dioxide wastes.
