Term
| What is the role of calcium ions in muscle contraction? |
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Definition
| Bind to regulatory sites on troponin to remove contraction inhibition. |
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Term
| What is the functional unit of a skeletal muscle called? |
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Definition
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Term
| Which of the following surrounds the individual muscle cell? |
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Definition
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Term
| Hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped, _______. |
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Definition
| No muscle tension could be generated |
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Term
| What structure in skeletal muscle cells function in calcium storage? |
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Definition
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Term
| During muscle contraction, myosin cross bridges attach to which active sites? |
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Definition
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Term
| What type of muscle assists an antagonist by causing a like movement or by stabilizing a joint over which an antagonist acts? |
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Definition
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Term
| Which of these is not a way of classifying muscles? |
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Definition
| The type of muscle fibers |
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Term
| What does excess postexercise oxygen consumption represent? |
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Definition
| the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used |
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Term
| Excitation-contraction coupling requires which of the following? |
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Definition
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Term
| Neurotransmitters that cause skeletal muscle contraction are normally stored in ____. |
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Definition
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Term
| After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction? |
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Definition
| acetylcholinesterase destroying the ACh |
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Term
| During vigorous exercise, there may be insufficient O2 available to completely break down pyruvic acid for energy. As a result the pyruvic acid is converted to __. |
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Definition
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Term
| Rigor Mortis occurs because ________. |
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Definition
| no ATP is available to release attached actin and myosin molecules. |
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Term
| What is the role of tropomyosin in skeletal muscles? |
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Definition
| serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules. |
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Term
| The sliding filament model of contraction involves____. |
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Definition
| actin and myosin sliding past each other and partially overlapping |
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Term
| An anaerobic metabolic pathway that results in the production of two net ATP's per glucose plus 2 pyruvic acid molecules is ____. |
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Definition
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Term
| What part of the sarcolemma contains ACh receptors? |
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Definition
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Term
| in an isotonic contraction the muscle ____. |
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Definition
| changes in length, and moves "the load" |
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Term
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Definition
| stores oxygen in muscle cells |
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Term
| What is the main factor that determines the power of a muscle? |
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Definition
| the total number of muscle cells available for contraction. |
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Term
| Which of the following is not a component of standard treatment for muscle strain? |
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Definition
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Term
| A muscle that opposes, or reverses, a particular movement is an ___________. |
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Definition
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Term
| What does biceps, triceps, quadraceps tell us? |
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Definition
| The muscle has 2, 3, 4 origins respectively |
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Term
| What is a muscle that provides the major force for producing a specific movement? |
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Definition
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Term
| The major function of the sarcoplasmic reticulum in muscle contraction is to _________. |
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Definition
| regulate intracellular calcium concentration |
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Term
| What produces the striations of a skeletal muscle cell? |
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Definition
| the arrangement of myofilaments |
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Term
| Which of the following statements is true? |
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Definition
| striated muscle cells are long and cylindrical with many nuclei |
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Term
| The term aponeurosis refers to _____. |
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Definition
| a sheetlike indirect attachment to a skeletal element |
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Term
| Creatine phosphate serves to __________. |
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Definition
| supply energy to synthesize ATP |
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Term
| The names of muscles often indicate the action of the muscle. What does levator mean? |
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Definition
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Term
| which of the following muscles is involved in producing horizontal wrinkles in the forehead? |
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Definition
| Frontal belly of the epicranius. |
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Term
| The strongest muscle contractions are normally achieved by ____. |
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Definition
| increasing the stimulation up to the maximal stimulus |
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