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Bio 106 #2 3 right
| Question | Answer |
|---|---|
| The refractory period | is the time during which the tissue cannot respond again. RIGHT |
| Which of the following helps explain the increased tension seen in multiple wave summation? | the breakdown of elastic elements in the cell NO |
| Complete tetanus | is the condition in which stimuli occur so rapidly that there are no intervening relaxations. |
| Which of the following will respond to a threshold stimulus with an all-or-none contraction? | a single muscle fiber and a single motor unit |
| Which of the following would occur as a result of a single muscle contraction? | twitch |
| After contraction has occurred, the calcium is | released from troponin. |
| When a muscle relaxes: | crossbridges stop forming and muscle elasticity returns the muscle to rest length. |
| the removal of calcium ions from the cytosol of skeletal muscle causes | The myosin binding sites on actin to be covered by tropomyosin |
| __________ degrades acetylcholine, keeping it from accumulating in the synapse. | Acetylcholinesterase |
| A power stroke involves: | a myosin head pulling a thin filament toward the center of the sarcomere. |
| Wrong | wrong |
| Muscle tone | is a condition in which stimuli occur so rapidly that there are no intervening relaxations. |
| Incomplete tetanus | is the condition in which stimuli occur so rapidly that there are no intervening relaxations. |
| During the contraction phase of a muscle twitch, | calcium ions are transported back to the sarcoplasmic reticulum. |
| Which of the following would contribute to muscular fatigue in the muscle fiber? | depletion of neurotransmitter |
| A sustained muscle contraction is known as | tetanus RIGHT |
| Tetanus of muscles is described as | action potential frequency is high enough that no relaxation of muscle fibers occurs. RIGHT |
| The stretch of elastic components of a muscle adds to the increased tension during | all or none response. |
| hole muscles can respond in a graded fashion to stimuli by varying | the frequency of stimulus. |
| A condition in which stimuli occur so rapidly that there are no intervening relaxations between contractions is called | complete tetanus. RIGHT |
| Which of the following is true? | Motor units do not obey the "all or none" law. |
| Tetanus of a muscle is thought to be caused by | high calcium ion concentrations in the sarcoplasm. RIGHT |
| A myogram is | a depiction of the results of a stress test. |
| The time between application of the stimulus to a motor neuron and the beginning of contraction is called the _____ phase. | refractory |
| In muscle contraction ATP supplies energy for | enzyme activity. |
| In excitation-contraction coupling, | movement of the troponin-tropomyosin complex causes actin myofilaments to slide. |
| ATP is necessary for each of the following mechanisms or functions in skeletal muscle except | Movement of myosin cross bridges |
| One ATP molecule is required for | formation of the cross-bridge and for movement of the cross-bridge. |
| Rigor mortis occurs in a dead person because | ATP, which is necessary for the detachment of cross bridges, is not being formed RIGHT |
| Which sequence correctly lists the changes that allow the thick and thin filaments to slide past one another in skeletal muscle contraction? | Attach - detach - pivot - return |
| During which phase of the crossbridge cycle is ATP split into ADP and P i? | Immediately preceding the power stroke |
| Which of the following statements is correct? | Filaments of troponin and tropomyosin slide past one another. |
| Arrange the following steps for contraction in the correct sequence. 1. The muscle impulse reaches the sarcoplasmic reticulum and | 4, 1, 3, 6, 2, 5 RIGHT |
| In order for muscle relaxation to occur, | sodium ions must be actively transported to troponin. |
| Binding of ________ to myosin permits cross-bridge _____________ between actin and myosin. | Calcium; detachment |
| A drug that interferes with the active transport of calcium ions from the sarcoplasm back into the sarcoplasmic reticulum would result in | fibrosis of the muscle. |
| Which of the following statements is true regarding skeletal-muscle contraction? | A single twitch in skeletal muscle lasts about as long as the action potential that caused it |
| When the myosin head flexes into a bend, pulling the actin filament along with it, this is called the | muscle tone. |
| For relaxation to occur: | Ach receptors close and Ca ++ channels on the sarcoplasmic reticulum close. RIGHT |
| A drug that inhibited acetylcholinesterase would result in: | enhanced stimulation of the muscle due to enhanced Ach release. |
Created by:
alexs13