The structure (a specialized synapse) that allows neurons to control our skeletalmusclefibers is called the:A. sarcolemmaB. neuromuscular junctionC. sarcoplasmic reticulumD. cross-bridge axiom
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muscle
fibers is called the:
A. sarcolemma
B. neuromuscular junction
C. sarcoplasmic reticulum
D. cross-bridge axiom
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- The structure (a specialized synapse) that allows neurons to control our skeletal muscle fibers is called the: 19. A. sarcolemma extracellular inard B. neuromuscular junction C. sarcoplasmic reticulum D. cross-bridge axiom arcople acellThe Terminal Cisternae are: A. The basic contractile unit in skeletal muscle OB. Equivalent to the cell membrane which covers the entire fiber. OC. A highly organized array of contractile units. OD. A specialized structure of the Sarcoplasmic reticulum which stores calcium. OE. None of the above.Muscles relaxatiom occurs when acetylcholine is cleaved from its receptors ,calcium is pulled back into the sarcoplasmic recticulum,the myosin is released from its binding site ,and the muscle fiber returns to its resting lenght true or false
- Nervous stimulation of musclesa. occurs at a neuromuscular junction.b. results in an action potential that travels down the T system.c. causes calcium to be released from expanded regions of the sarcoplasmic reticulum.d. All of these are correctA. nerve cell releases neurotransmitter which stimulates the muscle cell: B. calcium is released from sarcoplasmic reticulum and floods sarcoplasm; C. sarcolemma is permeable to sodium allowing sodium to rush into cell; D. myosin forms cross-bridges to pull actin into the center of the sarcomere; E. sarcolemma depolarizes and conducts an action potential Put them in orderContraction of muscle fibers in skeletal muscle is initiated by the uptake of calcium by the transverse (T) tubules. O the release of calcium from the transverse (T) tubules. O the release of calcium from the mitochondria. the uptake of calcium by the sarcoplasmic reticulum. the release of calcium from the sarcoplasmic reticulum.
- When a(n) __________ moves along the sarcolemma, the membrane potential changes along the membrane due to the opening and closing of voltage-gated Na+ and K+ channels. action potential sarcoplasmic reticulum calcium ion sarcomereWhich of the following statements is FALSE regarding skeletal muscle contraction? O a. Calcium binds troponin specifically on a calcium binding site which then leads to tropomyosin movement O b. The action potential of a motor nerve is transmitted to a muscle fibre through the neuromuscular junction which is a fusion of nerve and muscle cell membranes O c. Fine motor movement/control is a result of recruiting smaller motor units O d. Calcium is pumped into storage soon after it is released to the cytoplasmThe part of the sarcolemma that invaginates into the interior of skeletal muscle fibers is thea. T tubule system. c. myofibrils. e. mitochondria.b. sarcoplasmic reticulum. d. terminal cisternae.
- The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the a. movement of Na+ across their membranes only. b. removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP. c. removal of Ca2+ ions from the sarcoplasm only. d. removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP and movement of Na+ across their membranes. e. hydrolysis of ATP only.Stimulation of a muscle fiber by a motor neuron occurs ata. the neuromuscular junction.b. the transverse tubules.c. the myofibril.d. the sarcoplasmic reticulum.e. none of the above.Which of the following step(s) about the excitation of skeletal muscle is/are incorrect? 1. Acetylcholine is released and binds to motor end plate receptors 2. An action potential is created and moves down T-tubules 3. Calcium is released from the sarcoplasmic reticulum 4. Calcium ions bind to tropomyosin to shift troponin off the binding sites for cross-bridging 5. Myosin forms cross-bridges and binds with actin to pull it towards middle of sarcomere
