Summer06Test - Name Bio 416K Physiology and Functional...

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Name____________________________ Bio 416K: Physiology and Functional Anatomy Lecture Exam 3 Summer ‘06 1. The sarcoplasmic reticulum has the following role in muscle contraction: a. conduction of the action potential stimulated by the end plate potential b. contains the dihydropyridine receptor proteins that translate the sarcolemma action potential c. releases calcium in response to the sarcolemma action potential to initiate contraction d. supplies glycogen and fatty acids for ATP production within the sarcoplasm e. regulates Na + and K + levels within the sarcoplasm to reduce muscle fatigue 2. Skeletal muscles are said to be striated because of a repeating pattern of light and dark bands. One repeating unit of the entire pattern of bands is called a ________________. a. Z disk b. myofilament c. actin molecule d. sarcomere e. crossbridge 3. Which of the following muscles can extend the knee and flex the thigh? a. vastus lateralis b. vastus medialis c. rectus femoris d. vastus intermedius e. tensor fasciae latae 4. In cardiac muscle fibers, the membrane of the t-tubule contains Ca 2+ channel proteins that are sensitive to __________. a. voltage b. calcium ions c. sodium ions d. acetylcholine e. epinephrine 5. The release of epinephrine from adrenal medulla cells is caused by _________. a. stimulation by epinephrine on adrenal β 2 adrenergic receptors b. stimulation by norepinephrine on adrenal α adrenergic receptors c. stimulation by norepinephrine on adrenal β 2 adrenergic receptors d. stimulation by acetylcholine on adrenal nicotinic cholinergic receptors e. stimulation by acetylcholine on adrenal muscarinic cholinergic receptors 6. Which skeletal muscle fiber type fatigues fastest? a. Fibers with high myoglobin amounts b. Fibers with primarily glycolysis as the ATP source c. Fibers with high levels of oxidative metabolism d. Fibers with high amounts of mitochondria 1
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e. Fibers with actin and myosin arranged in long, diagonal bundl 7. A Ca 2+ -ATPase channel blocker would have what immediate effect on skeletal muscle contraction? a. enhance depolarization by increasing neurotransmitter release b. increase the strength of contraction by causing the release of more Ca 2+ ions c. decrease the strength of contraction by causing the release of less Ca 2+ ions d. decrease relaxation time by decreasing Ca 2+ return to the sarcoplasmic reticulum e. increase relaxation time by decreasing Ca 2+ return to the sarcoplasmic reticulum 8. As a muscle is increasingly stretched, as sometimes occurs in working with weights in the gym, why does the ability to generate force decrease? a. force does not decrease, it increases because stretch opens up Ca 2+ channels in skeletal muscle cell membranes b. more cross bridge formation can occur due to more overlap of thick and thin filaments c. actin has been moved toward the M line d. excessive muscle stretching creates maximum overlap of actin and myosin e. less cross bridge formation can occur due to less overlap of actin and
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Summer06Test - Name Bio 416K Physiology and Functional...

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