BIO 121 Study Guide - Quiz Guide: Sarcomere, Myofibril, Synovial Fluid
25 Apr 2017
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Motor unit (mu): composed of a motor neuron, axon, and muscle fibers: motor recruitment stronger contractions. Vertebrate skeletal muscles: pull on tendons connective tissue, attaches muscles to bones, muscle contraction pulls bone toward or away from the bone with which it articulates. The skeletal system: supports/protects body; transmits mechanical forces generated by muscles. Hydrostatic skeleton: fluid in closed body compartment transmits forces generated by contractile cells or muscles, found in soft-bodies invertebrates cnidarians, flatworms, annelids. Exoskeletons: nonliving skeleton characteristic of (cid:373)ollusks & arthropods; does(cid:374)"t gro(cid:449) (cid:894)arthropods (cid:373)olt(cid:895, anthropod skeleton composed partly of chitin; jointed for flexibility; adapted for many lifestyles. Endoskeletons: living tissue can grow, found in echioderms and chordates. The vertebrate skeleton: axial skeleton. skull, vertebral column, rib cage, sternum, appendicular skeleton. limbs, pectoral girdle, pelvic girdle. Key concepts: skeletal systems, whether they are hydrostatic skeletons, exoskeletons, or endoskeletons, support and protect the body and transmit mechanical forces important in movement.
