BIOL 152 Lecture Notes - Lecture 8: Cnidocyte, Coelenterata, Cnidaria
Document Summary
Bio 152 subject 8 for exam 3 myosin. A protein present in muscle fibers that aids in contraction and makes up the majority of muscle fiber tropanin allows muscle contraction to occur, monitored by ca levels tropomyosin. A helical protein that winds around actin helices in skeletal and cardiac muscle cells to form the thin filament of the sarcomere. In the absence of ca2+, tropomyosin covers the myosin-binding sites on actin and prevents muscle contraction. When calcium is present, a conformation change in tropomyosin occurs so that the myosin-binding sites are exposed and muscle contraction can occur. sarcomere. Contractile unit of muscle troponin complex the regulatory proteins that control the position of tropomyosin on the thin filament cnidaria. Also called coelenterata [se-len-ter-ah-tah], they develop from a diploblastic (two-layered) embryo, and have two separate tissue layers and radial body symmetry. Many have two life stages, the mobile, usually bell-like medusa and the sessile polyp.
