Which of the following events in muscle contraction is the last to occur chronologically? The T-tubules depolarize, causing calcium to be released from the sarcoplasmic reticulum. Calcium is taken up into the sarcoplasmic reticulum. Tropomyosin moves, exposing the actin active sites. ATP binds to the myosin head allowing it to release from actin.

he following is a list of the events that occur during a muscle contraction.1. Myosin cross-bridges bind to the actin.2. The free myosin head splits ATP.3. Calcium ion is released from the sarcoplasmic reticulum.4. The myosin head pivots toward the center of the sarcomere.5. Calcium ion binds to troponin.6. The myosin head binds an ATP molecule and detaches from the actin.The correct sequence of these events isQuestion 10Select one:a.3, 5, 1, 2, 4, 6.b.1, 3, 5, 4, 6, 2.c.1, 4, 6, 2, 3, 5.d.3, 5, 1, 4, 6, 2.e.5, 1, 4, 6, 2, 3.

n order for muscle contraction to occur during exercise calcium must bind to which of the following proteins? troponin. tropomyosin. myosin. actin.

During contraction of a muscle, calcium ions bind to ______ which moves _______ out of the way. This now uncovers binding sites on the __________ myofilament. multiple choice 1troponin; tropomyosin; myosintroponin; tropomyosin; actintropomyosin; troponin; myosintropomyosin; troponin; actin 2. What molecules are attached to the myosin head from the previous cycle of movement?  multiple choice 2ATP and phosphateADP and phosphateATP and calcium ionsADP and calcium ions 3. What is released in the process of cross-bridge formation?  multiple choice 3ADPPhosphateATPCalcium ions 4. When the myosin head is moved, what is released (from the myosin head)? multiple choice 4ATPADPPhosphateCalcium ions 5. After the myosin head returns to its upright position, what occurs if calcium ions are still present? multiple choice 5Actin myofilaments move away from the M line.The entire sequence is repeated.Troponin blocks the binding sites on actin.Myosin heads will no longer bind to actin.

During muscle contraction, the power stroke is the pivoting motion of the myosin head that pulls the actin filament inward to shorten the sarcomere.  Given this, which of the following events most immediately precedes this power stroke motion?A.The binding of ATP to the myosin headsB.The hydrolysis of myosin-bound ATPC.The release of Pi from the myosin headD.The binding of Ca2+ to tropomyosin

Put the following events of excitation-contraction coupling in the correct order.Rank the options below.Calcium ions are released into the sarcoplasm.Calcium ions are released into the sarcoplasm. open choices for rankingThe troponin-tropomysin complex moves, exposing active sites on the actin myofilaments.The troponin-tropomysin complex moves, exposing active sites on the actin myofilaments. open choices for rankingThe heads of myosin myofilaments bind to sites on the actin myofilaments, forming cross-bridges.The heads of myosin myofilaments bind to sites on the actin myofilaments, forming cross-bridges. open choices for rankingCalcium ions bind to troponin molecules on the actin myofilaments.Calcium ions bind to troponin molecules on the actin myofilaments. open choices for rankingA nerve impulse causes ACh to be released at a neuromuscular junction.A nerve impulse causes ACh to be released at a neuromuscular junction. open choices for rankingThe T tubules carry the action potential to the interior of the muscle fiber.