11) Which of the following best describes the term titin? A) storage site for ca
ID: 3479100 • Letter: 1
Question
11) Which of the following best describes the term titin? A) storage site for calcium ions B) largely made of myosin molecules C) repeating unit of striated myofibrils D) protein that accounts for elasticity of resting muscle E) thin filaments are anchored here 12) Which of the following acts as an ATPase during the contraction cycle of muscdle? A) the head portion of the myosin molecule B) the tail portion of the myosin molecule C) actin molecules D) tropomyosin molecules E) troponin molecules 13) The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle 13 fibers together is the A) epimysium B) superficial fascia. C) periosteum D) perimysium. E) endomysium 14) Interactions between actin and myosin filaments of the sarcomere are responsible for 14) A) muscle fatigue. B) the striped appearance of skeletal C) muscle relaxation. D) the conduction of neural stimulation to the muscle fiber. E) muscle contraction. muscle 15) Each thin filament consists of 15) A) two protein strands coiled helically around each other. B) chains of myosin molecules C) a rod-shaped structure with "Theads" projecting from each end. D) a double strand of myosin molecules. E) six molecules coiled into a helical structure. suppieuExplanation / Answer
Answer:-
11.option "D".
Explanation:-Titin, also known as connectin, is a protein that, in humans, is encoded by the TTN gene. Titin is a giant protein, greater than 1 µm in length, that functions as a molecular spring which is responsible for the passive elasticity of muscle.
12.option "A"-head of the myosin molecule.
Explanation;-ATP binds to the ATPase site of the myosin head
13.option "E"-endomysium.
Explanation:-
the delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together is the
edomysium.
14.option "E"-muscle contraction.
Explanation:-actin and myosin interact as per sliding filament theory to bring muscle contraction.
15.option "A"-
thin filament is actin which is a two protein( complex) strands coiled helically around each other.
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