MULTIPLE ANSWER QUESTIONS. Select all that apply. Which of the following occurs when the muscle is excited (contracting)? OThe myosin binding site on the actin thin filaments are covered O Ca2+ ion are being released from the sarcoplasmic reticulum into the sarcoplasm Zone of overlap of a sgrcomere increases The H-zone of a sarcomere gets larger The myosin head is NOT attached to the actin thin filament

MULTIPLE ANSWER QUESTIONS. Select all that apply. Which of the following occurs when the muscle is excited (contracting)? OThe myosin binding site on the actin thin filaments are covered O Ca2+ ion are being released from the sarcoplasmic reticulum into the sarcoplasm Zone of overlap of a sgrcomere increases The H-zone of a sarcomere gets larger The myosin head is NOT attached to the actin thin filament

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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In which type of muscle fibers is ATP synthesized aerobically in mitochondria? smooth cardiac skeletal all of the above 2. In which types of muscle fibers are action potentials transmitted from one cell to the next through gap junctions? unitary smooth and cardiac cardiac and skeletal skeletal and smooth 3. All types of muscle have actin and myosin, but not all types have sarcomeres." True False
Seconds Put the steps of excitation-contraction in order: 1 Myosin "heads" pivot, cause [ Choose ] Calcium is taken back up and the muscle relaxes Action potential triggers Ca2+ release from sarcoplasmic reticulum ACh produces large EPSP in muscle fiber 4 Muscle contracts Binding of Ca2+ to troponin causes myosin to bind to actin 5. EPSP evokes muscle action potential Alpha motor neurons release ACh Myosin "heads" pivot, cause filaments to walk along filament 7 [ Choose ) 8. [Choose ]
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Explain the requirements for Ca2+ and ATP in muscle contraction and relaxation. Remember that myofibers are cells and have cellular metabolic requirements as well.
Discuss the functions of muscle proteins (8 or more) and give an example for each.
Question one: Which of the following is TRUE concerning motor units? Group of answer choices None of these choices accurately describes a motor unit A motor unit consists of a motor neuron and all of the muscle fibers it innervates A motor unit consists of a motor neuron and all of the muscle cells within the epimysium A motor unit consists of a motor neuron and all of the skeletal muscle fibers connected by gap junctions pick one answer only question 2: A person is getting their blood type tested. The addition of anti-B antibodies causes agglutination, but not the addition of anti-A antibodies. The individual's blood type is type A type AB type B type O pick one answer only
Which of the following regions of a sarcomere does not change length during a contraction because it represents the length of the thick myosin filaments. Group of answer choices Z disk H band A band I band
Put in order the steps of activation, excitation and contraction of skeletal muscle.
S3
The size principle requires that the muscle fibers controlled by a single motor unit are all the same fiber type True False
1. Draw and label the steps of the sliding filament mechanism in skeletal muscle. This should be four parts (Cross- bridge, power stroke, disassociation, reactivation). On each part, be sure to include the following structures: actin, myosin, troponin, tropomyosin. Also include ATP, myosin ATPase, ADP, Pi, and H* (where important). • Cross-bridge: . Powerstroke: ● Disassociation: ● Reactivation:
The A bands of a muscle shorten during contraction True False All of the following prefixes refer to muscle except: mys- sarco- myo- muro-