D) Question 6 B. Increasine freauency of stimulation Using the Myogram above, what does line C represent? O Contractile period O Latent period O Summation Residual force O Tidal volume O Tetanus O Lag time Fatigue electromyography Relaxation period

If we stimulate a skeletal muscle at a voltage above the maximal stimulus voltage and above the fusion frequency, the resulting contraction will exert the _______________________ (3 words).

QUESTION 8 How does the nervous system grade the force of muscle contraction? O a. Only by recruiting additional motor units O b. Only by varying the firing rate of the motor neurons O c. By varying the firing rate of the motor neurons and by recruiting additional motor units O d. By using more motor neuron pools

Refer to the electromyogram (EMG). Select the correct statements. motor unit C motor unit motor unit A. EMG 1 sec force Force production is modulated by recruitment of motor units. A motor unit is composed of a few muscle fibers innervated by an upper motor neuron. According to the Henneman's size principle, the large motor units will be recruited followed by the small motor units. Small motor units have small cell body. Large motor units have many fast twitch Type I muscle fibers. Small motor units have lower threshold and 'high' excitability. Large motor units produce high tetanic tension and contraction speed.

Increased sensory discharge from muscle spindles :-a- decreases muscle toneb- increases muscle tonec- could either increase or decrease muscle tone according to the muscle affectedd- has no effect on muscle tone

Why is the increase in velocity inversely proportional to the sarcomere length?

Select all correct answers (i.e. more than one answer may be correct). What is the advantage of having a muscle with a bipennate muscle fiber orientation rather than a longitudinal fiber orientation? Assume that the general muscle volume is held constant between orientation types. Obipennate muscle has a smaller physiological cross-sectional area Obipennate muscle has larger force-producing capabilities Obipennate muscle has a greater muscle shortening capability

What neural or hormonal signal caused the change in MAP observed with prolonged muscle contraction?  (select all that apply) -Decreased ACh -Increased ACh -Increased EPI/NE -Decreased EPI/NE

Clonus :-a- is a sign of decreased supraspinal facilitationb- initiated by briefly stretching the tendon of the musclec- is manifested as oscillating mechanical vibrations following tendon jerksd- associates exaggeration of tendon jerks

Question Completion Status O myosin filament O myofibril QUESTION 5 Identify the structure of the muscle fiber as indicated by the arrow in the image. O myofibril O muscle fiber O fascicle O myofilament Click Save and Submit to save and submit. Click Save All Answers to save all answers.