The following is an oscilloscope tracing displaying the muscle twitch of an intact, viable frog skeletal muscle. The muscle was stimulated via electrodes placed on the muscle at time zero and again at 75 msec. Which of the following physiological phenomena does this demonstrate? 6 6 4 2 1 € 0 O O O O 20 O treppe O fatigue 40 60 80 100 120 140 160 180 200 Time (msec) fused tetanus Owave summation

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 ]

Please help in answering this question on toadfish physiology and muscle contractions.

When utilizing microprocessor technology for testing muscle strength, you are typically looking at what form of muscle contraction?     Concentric   Isokinetic   Isometric   Eccentric

When motor units are recruited to participate in tension development in a muscle, the order of recruitment is typically: Question 13 options:   from slow twitch to fast twitch   from fast twitch to slow twitch   it depends on the type of contraction   related to the size and shape of the muscle

Match the following types of contractions: The stimulus above which no stronger contraction can be elicited, because all motor units are firing in the muscle Determined by alternating motor units of a muscle organ even when the muscle is at rest Continued sustained smooth contraction due to rapid stimulation The situation in which contractions become stronger due to stimulation before complete relaxation occurs How a smooth increase in muscle force is produced [Choose] [Choose ] [Choose] [Choose] [Choose]

Ca2+ does not play a role in muscle relaxation true or false

Electrical stimulation of skeletal muscle at 5Hz results in a single muscle twitch. Define the stages and stimulation rates required to achieve a fused tetanus.

In which type(s) of muscle cells does each cell have its own neuromuscular junction?                                 skeletal only                                 unitary smooth and skeletal                                 skeletal and cardiac       2. The follow is NOT true of CARDIAC muscle fibers:        - connected by gap junctions       -  include pacemaker cells that can produce produce action potentials at regular intervals without innervation        - without calcium cross bridge cycles will not occur and fibers will not shorten        - each cell in a motor unit has a neuromuscular junction with the same motor neuron                                 actin and myosin filaments are arranged in sarcomeres                                 produce greater force when stretched than at resting length   3. Match the following:   -Skeletal muscle   -Cardiac muscle   -Smooth muscle Can maintain prolonged isometric contractions with very little energy Striated muscle fibers with gap…

The size principle requires that the muscle fibers controlled by a single motor unit are all the same fiber type True False