BIO210 chapter 10 Test Questions and Answers All Correct (1)

BIO210 chapter 10 Test Questions and Answers All Correct (1) organ - Answer-A collection of tissues that carry out a specialized function of the body -fascicles - Answer-bundles of muscle fibers -muscle fibers - Answer-long, slender cells that make up muscles -epimysium - Answer-a sheath of fibrous elastic tissue surrounding a skeletal muscle -perimysium - Answer-The connective tissue that surrounds fascicles -endomysium - Answer-Connective tissue surrounding individual muscle fibersThe connective -tendon - Answer-Connects muscle to bone -aponeurosis - Answer-strong sheet of tissue that acts as a tendon to attach muscles to bone -deep fascia - Answer-dense irregular connective tissue external to the epimysium that separates individual muscles and binds muscles with similar functions -superficial fascia - Answer-areolar connective tissue that underlies the skin and attaches it to the superficial layer of muscles -sarcoplasm - Answer-cytoplasm of a muscle fiber -sarcolemma - Answer-plasma membrane of a muscle fiber -T-tubules (transverse tubules) - Answer-deep invaginations of the sarcolemma that extend into the skeletal muscle fiber as a network of narrow membranous tubules to the sarcoplasmic reticulum -myofibrils - Answer-composed of myofilaments, extending the length of the muscle in groups of hundreds to thousands to form a single muscle fiber -sarcoplasmic reticulum - Answer-specialized endoplasmic reticulum of muscle cells that is a membrane around myofibrils and contains the terminal cisternae holding calcium ions at each end -terminal cisternae - Answer-enlarged areas of the sarcoplasmic reticulum that surround the T tubule and store calcium ions -triad - Answer-two terminal cisternae and one T tubule -myofilaments - Answer-The contractile proteins, actin and myosin, of muscle cells -thick filaments - Answer-composed of 200-500 myosin protein molecules -myosin - Answer-The contractile protein that makes up the thick filaments of muscle fibers -thin filaments - Answer-thin double strands of actin with troponin and tropomyosin protein structures featuring myosin binding sites -actin - Answer-A globular protein that links into filamentous chains, two of which twist helically about each other, forming microfilaments in muscle -tropomyosin - Answer-thin string-like protein that covers myosin binding sites on actin -troponin - Answer-a globular protein complex involved in muscle contraction. It occurs with tropomyosin in the thin filaments of muscle tissue. -sarcomeres - Answer-contractile units within myofibrils, the smallest contractile unit of a muscle -Z discs - Answer-narrow, plate-shaped regions of dense material that separate one sarcomere from the next -I bands - Answer-visually light bands of that contain only thin filaments and connectin that disappear parallel to thick filaments in maximal muscle shortening -A band - Answer-visually dark area containing thick and thin filaments that extends the length of the thick filaments (myosin) and does not change length during muscle contraction. -H zone - Answer-The region at the center of an A band of a sarcomere that is made up of myosin only. The H zone gets shorter (and may disappear) during muscle contraction. -M line - Answer-a line of supporting proteins that hold the thick filaments together in the H zone