BIOL 3152 Study Guide - Midterm Guide: Axial Skeleton, Shoulder Girdle, Appendicular Skeleton

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1 Nov 2018
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Intervertebral disks: lie between centra in acoelous; made of connective tissue, notochord remnants, and fibrocartilage. Skeletal muscle: most common type of muscle in the body because it forms many individual muscles that attach to skeletal elements. {{side note: actin and myosin work together to move the muscles through contraction. Most of the cytoplasm (skeletal muscle cells) consists of myofibrils, which are cylindrical bundles of two types of filaments: thick filaments of myosin and thin filaments of actin}} In order to maximize the force of contraction, actin and myosin myofilaments slightly overlap (makes muscle fibers appear striated). The nerve stimulates the muscle fibers and distributes fiber membrane. Cardiac muscle: cardiac muscle of the heart wall is composed of moderately elongated cells (???) that frequently branch, development: each cardiac cells originates from a single myoblast, so it contains a. I. e. there are less fibers present in a motor unit that moves the eye versus leg muscle maintaining posture.

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