A&P Straighterline Final Exam Questions and Answers 2024

A&P Straighterline Final Exam Questions and Answers 2024 An isotonic contraction is described as Select one: a. action potential frequency is high enough that no relaxation of muscle fibers occurs. b. a muscle produces constant tension during contraction. c. a muscle produces an increasing tension during contraction. d. a muscle produces increasing tension as it shortens. e. a muscle produces tension, but the length of the muscle is increasing -Correct Answer-b. a muscle produces constant tension during contraction. After contraction has occurred, the calcium is Select one: a. destroyed by cholinesterase. b. chemically bound to the cross bridges. c. secreted by the Golgi apparatus to the outside of the cell. d. released from troponin. e. returned to the sarcolemma. -Correct Answer-d. released from troponin. Increased strength of a trained muscle is due to Select one: a. an increased number of muscle fibers. b. the nervous system's ability to recruit a large number of motor units simultaneously. c. elimination of unnecessary enzymes and metabolic pathways. d. elimination of all fat deposits. e. elimination of unnecessary connective tissue. -Correct Answer-b. the nervous system's ability to recruit a large number of motor units simultaneously. Skeletal muscle fibers Select one: a. possess striations. b. can contract but are not extensible or excitable. c. do not require nerve innervation to contract. d. increase dramatically in number after birth. e. are found in the walls of the stomach. -Correct Answer-a. possess striations. Which of the following correctly describes myoglobin's special function in muscle tissue? Select one: a. breaks down glycogen b. synthesizes ATP c. acts as a reservoir for oxygen d. produces action potentials e. stores glucose -Correct Answer-c. acts as a reservoir for oxygen The outside of the resting plasma membrane is __________ relative to the inside of the resting plasma membrane. Select one: a. positively charged b. negatively charged c. electrically neutral d. recharged e. None of these choices is correct. -Correct Answer-a. positively charged Fascia Select one: a. surrounds individual muscles. b. separates muscle fibers. c. connects muscles to bone. d. is a type of muscle tissue. e. is a type of nerve tissue. -Correct Answer-a. surrounds individual muscles. When repolarization of the cell membrane is complete, the Select one: a. cell dies. b. cell regenerates. c. cell no longer has a potential difference across its membrane. d. cell is no longer responsive. e. original polarity of the cell is restored. -Correct Answer-e. original polarity of the cell is restored. Which of the following actions is caused by contraction of skeletal muscle? Select one: a. contraction of the heart b. moving your feet in walking c. movement of food through the digestive tract d. emptying of the urinary bladder e. vasoconstriction -Correct Answer-b. moving your feet in walking What is smooth muscle tone? Select one: a. can rapidly develop action potentials b. shallow invaginations of cell membrane c. relatively constant tension maintained for a period of time d. intracellular cytoskeleton e. enzyme that removes phosphate from myosin -Correct Answer-c. relatively constant tension maintained for a period of time The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called Select one: a. neuromuscular junctions. b. sarcomeres. c. myofilaments. d. Z disks. e. cell body of neuron. -Correct Answer-a. neuromuscular junctions. List the following structures in order from smallest to largest. (1) muscle fiber (2) myofilament (3) myofibril (4) muscle fasciculus Select one: a. 4, 2, 3, 1 b. 2, 1, 4, 3 c. 3, 1, 4, 2 d. 2, 3, 1, 4 e. 1, 2, 3, 4 -Correct Answer-d. 2, 3, 1, 4 Which of the following is NOT true o