chapter 9 - muscular system
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During which phase are calcium ions actively transported into the sarcoplasmic reticulum? | show 🗑
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show | It is used to quickly regenerate ATP from ADP.
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T or F: Not all motor units of one entire skeletal muscle contract at once. | show 🗑
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show | false
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Muscle fatigue is a condition described by ______ and is usually caused by prolonged use of a muscle. | show 🗑
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A muscle that functions to cause action is referred to as the ______. | show 🗑
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The end of a muscle that is fixed (relatively immovable) is called its ______. | show 🗑
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show | axons
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show | skeletal muscle
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The muscle shortens and generates force during the ___ phase of a muscle twitch. | show 🗑
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The first stage of anaerobic and aerobic respiration is ___. | show 🗑
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Tube-like invaginations of the sarcolemma that conduct action potentials toward the center of the muscle fiber are called ___. | show 🗑
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supplies energy for the synthesis of ATP | show 🗑
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Name the cordlike structures that connect muscles to bone | show 🗑
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show | synapse
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Binding sites on the surface of actin allow the formation of cross-bridges with molecules of | show 🗑
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show | perimysium and endomysium
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Site for storage of calcium | show 🗑
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Threadlike bundles of thick and thin filaments | show 🗑
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show | mitochondria
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The first event in muscle fiber contraction is that | show 🗑
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show | decompose
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A runner collapses during a race and is examined by a doctor. They have lost the ability to plantar flex at the ankle. Which of the following is probably the injured muscle? | show 🗑
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Rigor mortis affects skeletal muscles a few hours after death, due to | show 🗑
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Muscle fatigue is due in part to decreased ATP levels in muscle cells. | show 🗑
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Transverse (T) tubules are invaginations of the sarcolemma of a muscle cell. | show 🗑
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show | Troponin
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In order for muscle contraction to occur, cross-bridges form between __________. | show 🗑
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The muscle that opposes a particular action is called | show 🗑
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In a recording of a muscle twitch, the delay between the time a stimulus is applied and the time the muscle responds is called the | show 🗑
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show | True
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show | ATP
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bundles of fibers are called ___________ and is covered by the perimysium | show 🗑
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Which of the following are types of muscles and are involuntary? | show 🗑
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In excitation-contraction coupling, the protein called ______ moves to expose binding sites on the actin filaments that can form cross-bridges. | show 🗑
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A skeletal muscle fiber is ______. | show 🗑
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During muscle contraction, the sarcomeres shorten because ______. | show 🗑
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The process of glycolysis is ______. | show 🗑
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When is lactic acid produced? | show 🗑
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True or false: Muscles generate heat when they contract. | show 🗑
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When a single muscle fiber contracts when stimulated by a single impulse, the contractile response is called a(n) ______. | show 🗑
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show | smooth
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During a(n) ______ muscle contraction, the muscle either lengthens or shortens, while the tension stays constant. | show 🗑
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during high-intensity exercise, anaerobic metabolism results in the production of pyruvic acid, which is then converted to ? acid | show 🗑
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show | epimysium
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show | false
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anaerobic respiration occurs primarily in mitochondria | show 🗑
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Liver cells convert lactic acid to ATP | show 🗑
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the minimal strength of stimulation needed to elicit a muscle contraction is called the threshold stimulus | show 🗑
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show | false
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show | false
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Metabolic processes can use only about 25% of the energy released by cellular respiration | show 🗑
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the two major types of smooth muscles are intercalated muscle and cardiac muscle | show 🗑
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cardiac muscle is voluntary | show 🗑
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muscles and bones function as levers | show 🗑
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the masseter muscle functions in mastication | show 🗑
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exercise can lead to new muscle filament formation---even in old people | show 🗑
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