One sarcomere contains all of the following except a

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19) One sarcomere contains all of the following EXCEPT: A) the H zone B) myosin C) myofibils D) the M line Answer: C Topic: MICROSCOPIC ANATOMY OF SKELETAL MUSCLE FIBERS TRUE/FALSE. Write "T" if the statement is true and "F" if the statement is false. 20) During an isotonic contraction of a muscle, the muscle shortens while the tension in the muscle increases, as in straightening the legs when rising from a sitting position to a standing position. Answer: FALSE Topic: PROPERTIES OF MUSCLE TISSUE 21) A motor neuron is a nerve cell that stimulates a muscle cell, causing a contraction. Answer: TRUE Topic: SKELETAL MUSCLE TISSUE 22) A bundle (fascicle) of skeletal muscle cells is separated from neighboring bundles by perimysium. Answer: TRUE Topic: SKELETAL MUSCLE TISSUE 23) Epimysium surrounds skeletal muscle cells within fascicles. Answer: FALSE Topic: SKELETAL MUSCLE TISSUE 24) A motor neuron together with all the skeletal muscle fibers it stimulates is called a motor unit. Answer: TRUE Topic: MOTOR UNIT 25) The darker area in a sarcomere is the I band. Answer: FALSE Topic: SKELETAL MUSCLE TISSUE 4
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26) The contractile elements of skeletal muscle cells are myofibrils. Answer: TRUE Topic: SKELETAL MUSCLE TISSUE 27) Hypotonia of skeletal muscles is accompanied by spastic paralysis. Answer: FALSE Topic: MUSCLE TONE 28) Cardiac muscle cells contain more mitochondria than do skeletal muscle cells. Answer: TRUE Topic: CARDIAC MUSCLE TISSUE 29) Cardiac muscle tissue may be classified as either visceral or multiunit smooth muscle. Answer: FALSE Topic: SMOOTH MUSCLE TISSUE 30) New skeletal muscle cells can arise from satellite cells. Answer: TRUE Topic: REGENERATION OF MUSCLE TISSUE 31) The specialized region of sarcolemma that is located at a neuromuscular junction is called the synaptic cleft. Answer: FALSE Topic: NEUROMUSCULAR JUNCTION ESSAY. Write your answer in the space provided or on a separate sheet of paper. 32) List four functions of muscle tissue and in one sentence for each function, elaborate on the function or give an example to illustrate the function. Answer: 1. Motion: movement of bones as in walking 2. Movement of substances: for example, cardiac muscle pumps blood, smooth muscle helps move food and urine 3. Maintains posture and regulates organ volume: for example, sustained contractions of skeletal muscle maintains sitting or standing position; smooth sphincter muscles control movement of substances through digestive and urinary tracts 4. Heat production: heat is a by-product of skeletal muscle contraction Topic: FUNCTIONS OF MUSCLE TISSUE 33) List, categorize, and describe the proteins found in myofibrils. Answer: See p. 236 for descriptions of actin and myosin (the contractile proteins), troponin and propomyosin (the regulatory proteins), and titin and dystrophin (the structural proteins). Topic: MUSCLE PROTEINS 34) Describe the events that occur in a sarcomere according to the filament theory of muscle contraction.
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