When Joe raised the can, his biceps brachii muscle performed a(an) _____contract

Question

When Joe raised the can, his biceps brachii muscle performed a(an) _____contraction and when he lowered the can to the desk, the muscle performed a(an)_____contraction. A) tetanic, concentric B) eccentric concentric C) eccentric, isometric D) concentric, eccentric E) isometric eccentric When Joe first lifted the can it was full and when he lifts for the last time to enjoy the last drink the can is almost empty. In spite of this, Joe is able to lift the can smoothly each time he takes a drink. How does he accomplish this? A) Joe used fast twitch fibers when the can was full and slow twitch fibers when the can was nearly empty. B) Joe used more motor units when the can was full and fewer when the can was nearly empty. C) Joe used slow twitch fibers when the can was full and fast twitch fibers when the can was nearly empty. D) Joe used fewer motor units when the can was full and more when the can was nearly empty. E) Joe used the tendon reflex when he lifted the full can and the stretch reflex when he lifted the nearly empty can. When Joe extended his arm and lifted the full can, he had the weight of the full can in his right hand but nothing in his left hand. However, Joe remained fully upright in his chair. What helped Joe accomplish this? A) Activation of the tendon reflex in his postural muscles. B) Activation of the flexor reflex in his postural muscles. C) Activation of the stretch reflex in his postural muscles. D) Activation of the crossed extensor reflex in his postural muscles. E) Activation of the flexor reflex in the quadriceps muscles of his right leg. Why does tension increase in a skeletal muscle with high frequency stimulation from its motor neuron? A) Calcium accumulates in the sarcoplasm because the voltage gated calcium channels in the sarcolemma can't work fast enough to remove calcium from the sarcoplasm. B) Calcium accumulates in the sarcoplasm and causes more acetylcholine to be released from the motor end plate. C) Calcium accumulates in the sarcoplasm because the calcium pump in the sarcolemma can't work fast enough to remove calcium from the sarcoplasm D) Calcium accumulates in the sarcoplasm because the voltage gated calcium channels the terminal cisternae can't work fast enough to remove calcium from the Joe has finished his Red Bull and completed his daily study session for Anatomy and Physiology. Joe's hobby is running marathons and he runs 10 miles per day to keep in shape. What proportion of fast muscle fibers to slow muscle fibers are found in Joe's leg muscles compared to a sprinter? A) Equal of fast and slow fibers. B) Equal numbers of fast, slow, and intermediate fibers C) More slow fibers than fast fibers. D) More fast fibers than slow fibers. E) Joe's leg muscles are atrophied because Red Bull gives you wings. He flies everywhere so his leg muscles aren't used.

Explanation / Answer

13. A) tetanic, concentric

The tetanic contractions are sustained muscle contractions that occur during the innervation ir the motor neurons when action potentials are emitted by the skeletal muscle at very high rates.

14. E) joe used the tendon reflex when he lifted the full can and stretch reflex when he lifted the nearly empty can.

15. C) Activation of stretch reflex in his postural muscles.

17. C) more slow fibres than fast fibers

The slow twitch fibres take longer time to burn out completely and get tired as they use oxygen to fire. People enjoying longer running and marathons have higher proportion of these fibres. In these muscles, force per contraction is spread over a longer duration.

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