Openstax Anatomy and Physiology: Chapter 10 Muscle Tissue

Openstax Anatomy and Physiology: Chapter 10 Muscle Tissue Slow fibers have a small network of _______. - ANS Capillaries Muscle relaxation occurs when ________. - ANS calcium ions are actively transported into the sarcoplasmic reticulum Drug X blocks ATP regeneration from ADP and phosphate. How will muscle cells respond to this drug? - ANS none of the above Muscle fatigue is caused by ________. - ANS exhaustion of energy reserves and buildup of lactic acid levels Which element is important in directly triggering contraction? - ANS calcium (Ca++) From which embryonic cell type does muscle tissue develop? - ANS myoblast cells The muscles of a professional sprinter are most likely to have ________. - ANS 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibers A sprinter would experience muscle fatigue sooner than a marathon runner due to ________. - ANS anaerobic metabolism in the muscles of the sprinter The muscles of a professional marathon runner are most likely to have ________. - ANS 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibers During muscle contraction, the cross-bridge detaches when ________. - ANS calcium ions bind to troponin If cardiac muscle cells were prevented from undergoing aerobic metabolism, they ultimately would ________. - ANS stop contracting What is common to all three muscle tissues? - ANS excitability, the need for ATP and elasticity Which cell type helps to repair injured muscle fibers? - ANS satellite cells In relaxed muscle, the myosin-binding site on actin is blocked by ________. - ANS tropomyosin What aspect of creatine phosphate allows it to supply energy to muscles? - ANS phosphate bonds According to the sliding filament model, binding sites on actin open when ________. - ANS calcium ion levels rise During which phase of a twitch in a muscle fiber is tension the greatest? - ANS contraction phase What fibers have large glycogen reserves. - ANS Fast