38) The cross bridge cycle in a skeletal muscle fiber is triggered by the increa

Question

38) The cross bridge cycle in a skeletal muscle fiber is triggered by the increase in the cytosol of , flowing from the A) Na(cations); Sarcoplasmic Reticulum C) Ca(cations); Thick filaments B) K(cations); Z lines D) Ca(cations); Terminal cisternae 39) Cells that detect mechanical stress applied to a bone when it is moved are named A) Chondrocytes B) Osteoclasts C) Osteocytes D) Osteoblasts 40) Which of the following statements is most accurate? A) Muscle tension is produced by both isotonic contraction and isometric contraction. B) The thin myofilaments lengthen during isotonic contraction. C) Thin myofilaments slide considerably during isometric contractions. D) T tubules may be sliding during isotonic contraction.

Explanation / Answer

38.The cross bridge cycle in a skeletal muscle fiber is triggered by the increase in the cyosol of ca(cations), flowing from the terminal cisternae.(sarcoplasmic reticulum contain terminal cisternae at the end of each near t-tublues, calcium is stored and released from the terminal cisternae during membrane excitation).(option d) 39. cells that detect mechanical stress applied to a bone when it is moved are named osteoblasts(option d) (when mechanical stress is applied to bone increase in osteoblast activity when mechanical stress decreases osteoblast activity results in less bone density) 40.the thin myofilament lengthen during isotonic contraction(in isotonic contraction the length of the muscle changes but in isometric length remains constant).

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