Describe the role of calcium in the crossbridge cycle of the sliding filament mechanism
What will be an ideal response?
Calcium ions released from the sarcoplasmic reticulum bind to troponin. Upon binding, tropomyosin moves and the active sites of actin filaments are now exposed. Once the active sites are exposed, crossbridge formation may commence when myosin heads bind to the active sites on the actin filaments. A crossbridge cycle is now initiated in which the thick and thin filaments slide past one another.
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A) Inspiratory capacity B) Total lung capacity C) Vital capacity D) Functional residual capacity 18) TV + IRV + ERV + RV. 19) ERV + RV. 20) TV + IRV + ERV. 21) TV + IRV.
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A. neutrons B. particles C. protons D. electrons E. protons and neutrons
Typically, there are ________ papillary muscles that project from the wall of the left ventricle and attach to the tendinous cords that support the left AV valve.
A. three B. a highly variable number of C. no D. two E. six
Which of these cells would most likely have the largest number of mitochondria?
A. skin cells B. blood cells C. fat cells D. bone cells E. muscle cells