Exercise Physiology (Comprehensive Final) 100% Accurate Solutions.

Action Potential-release of Acetylcholine (Ach) at the neuromuscular junction (NMJ) correct answers MC #1 MC #2 correct answers Ach binds to receptors causing AP to "spread" over the muscle fiber in the T-tubules and stimulate the SR MC #3 correct answers AP stimulates release of Ca2+ from SR MC #4 correct answers Ca2+ binds to troponin causing a shift in the tropomyosin revealing active sites on actin MC #5 correct answers Breakdown (hydrolysis) ATP "cocks" myosin head MC #6 correct answers "Cocked" myosin attaches to actin and movement (muscle contraction) occurs MC #7 correct answers Cross-bridge detachment requires new ATP MC #8 correct answers Events occur as long as Ca2+ is present MC #9 correct answers Ca2+ is present as long as AP's are delivered to the SR MC #10 correct answers In the absence of AP, the SR recycles (takes up) the Ca2+ MC #11 correct answers Troponin & tropomyosin shift back to their resting position (therefore no muscle contraction) Circulatory System correct answers -Superior & inferior vena cava -Left atrium -Bicuspid valve -Left ventricle -Pulmonary artery -Pulmonary veins -back through the L atrium & L ventricle -Then through the aorta Harvard Fatigue Lab correct answers Dill & Henderson (took 20 people, working 12 hour shifts to keep machine running) Stephen Horvath correct answers PhD student at HFL, opened lab in Santa Barbara. Sid Robinson correct answers PhD student at HFL, opened lab at IU