BIOL 348 EXAM 2 QUESTIONS AND 100% APPROVED CORRECT ANSWERS GRADED A+ 2025 FIRST CLASS PASS

BIOL 348 EXAM 2 QUESTIONS AND 100% APPROVED CORRECT ANSWERS GRADED A+ 2025 FIRST CLASS PASS 2025 EXAM  BIOL 348 EXAM 2 QUESTIONS AND 100% APPROVED CORRECT ANSWERS GRADED A+ 2025 FIRST CLASS PASS Most accurately describes the innervation of skeletal muscle - CORRECT ANSWERmotor neurons communicate with the muscle fiber directly Perimysium - CORRECT ANSWERPerimysium is the connective tissue that surrounds bundles (fascicles) of skeletal muscle cells. The function of calcium ions in skeletal muscle contraction is to - CORRECT ANSWERBind to regulatory proteins leading to change in shape so that the myosin binding sites on the actin can be exposed. The contractile proteins within a muscle (cell) are: - CORRECT ANSWERactin and myosin Fasicles - CORRECT ANSWERWithin each skeletal muscle, the muscle fibers are separated into group. Each group, which resembles a bundle of sticks tied together is called fascicles. Sarcomeres - CORRECT ANSWEREach muscle fiber is divided or compartmentalized into repeating segments of contraction called -Basic unit of contraction in skeletal muscle I band - CORRECT ANSWERThe ends of the sarcomere, where there are ONLY thin filaments. Thin Filaments - CORRECT ANSWERActin, troponin, tropomyosin Myosin - CORRECT ANSWERThick filament Aponeurosis - CORRECT ANSWERExtension from a muscle that forms a broad flat sheet. Tendon - CORRECT ANSWERExtension from a muscle that connects a muscle to bone Motor Unit Recruitment - CORRECT ANSWERWhen the muscle fibers need to get more help (increasing number of motor units in a contraction). t-tubules - CORRECT ANSWEROut pocketings of the plasma membrane. myo- mys- - CORRECT ANSWERMuscle Epimysium - CORRECT ANSWERAn outer layer of dense, irregular connective tissue surrounds the whole skeletal muscle _"outside the muscle" Endomysium - CORRECT ANSWERWithin a fascicle, each muscle fiber is surrounded by a fine sheath of loose connective tissue consisting mostly reticular fibers. myofibrils - CORRECT ANSWER-Dark striations visible in microscope -Rod like contractile organelles that occupy most of the muscle cell volume -contain myofilaments -Composed of repeating segments called sarcomeres Z Discs (or lines) - CORRECT ANSWERThe boundaries at the two ends of a sarcomere. Thin (actin) filaments - CORRECT ANSWERAttached to each Z disc and extending toward the center of the sarcomere are many fine myofilaments. Actin - CORRECT ANSWER-Thin filaments are composed primarily of this contractile protein. -tropnin and tropomyosin are also found on the thin filament Thick (myosin) Filaments - CORRECT ANSWER-Consist largely of myosin molecules -They are in the center of the sarcomere and overlapping the inner ends of the thin filaments in a cylindrical bundle. I Band - CORRECT ANSWERThe two regions on either side of the A band , regions that contain only thin filaments. The 3 Types of Muscle Tissue - CORRECT ANSWER1. Skeletal 2. Cardiac 3. Smooth From what embryonic germ layer is muscle derived from? - CORRECT ANSWERMesoderm What are the special characteristics of skeletal muscle tissue? - CORRECT ANSWERMyofibrils (actin and myosin filaments) which are the basic functional units of a muscle fiber which allow for contraction. What are the two types of muscle contraction - CORRECT ANSWEREccentric & Concentric Contraction Characteristics of excitable tissues - CORRECT ANSWERrespond to changes in electrical potential muscle, nervous tissue voluntary and involuntary signal transduction