A) actin
B) myosin
C) tropomyosin
D) troponin
E) calcium
G) A) and E)
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A) Bone is active,growing tissue with an extensive blood supply.
B) Bone is similar to cartilage,nearly inert,and with little blood supply.
C) Bone is active and living when formed by osteoblast but dies after it hardens.
D) Bone is nonliving calcium deposits and removing bone is a bloodless operation.
E) The outer compact bone is nonliving calcium,but the bone marrow is active living tissue.
G) C) and D)
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A) tibia is to the femur.
B) fibula is to the ulna.
C) fibula is to the tibia.
D) humerus is to the femur.
F) C) and D)
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A) tropomyosin.
B) troponin.
C) actin.
D) myosin.
E) cross bridges.
G) B) and E)
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A) when high levels of oxygen and sugar are released by the sarcolemma.
B) when a surplus of ATP is released by a nerve motor unit.
C) by release of a neurotransmitter at a synapse that directly causes actin and myosin to slide.
D) by the nerve releasing a neurotransmitter,which triggers a flow of calcium that attaches to actin filaments and exposes the myosin binding sites.
E) by the nerve releasing a neurotransmitter,which triggers a flow of calcium that releases ATP and begins the actin filaments sliding across the myosin binding sites.
G) B) and C)
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A) there is too much oxygen in the muscle tissues.
B) ATP is depleted,and the body starts to use creatine phosphate to supply new ATP.
C) ATP is depleted,and the body starts breaking down actin and myosin to allow muscle contraction to occur.
D) there is no oxygen for aerobic respiration,and the body must use lactic acid fermentation to produce ATP.
E) None of the choices are correct.
G) C) and D)
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A) sodium ions
B) calcium ions
C) ATP
D) creatine phosphate
E) acetylcholine
G) C) and D)
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Correct Answer
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A) The skeleton of a vertebrate is an endoskeleton.
B) The skeleton of an arthropod is an exoskeleton.
C) The skeleton of a clam is an exoskeleton.
D) All exoskeletons must be shed as the animal grows.
E) An earthworm has a fluid-filled cavity that acts as a hydrostatic skeleton.
G) C) and D)
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Correct Answer
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