Question 4 1 pts What terms best describes the ability of muscle to recover from contraction? ○ contractility O extensibility ○ elasticity O excitability O all of the above ◄ Previous Next ▸ (ع)
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- Question 87 In smooth muscle fibers, the thin filaments attach to structures called functionally similar to Z discs in striated muscle fibers.Question 6 (1 point) The crossbridge cycle can begin when an action potential travels t-tubules O sodium enters the muscle fiber calcium is released from the sarcoplasmic reticulum O acetylcholine binds to ligand gates calcium is moved into the sarcoplasmic reticulumQuestion 2 Which of these are shortened during a muscle twitch? O Actin O I band மவவு O Z-disc Myosin O Azone
- Question 2 of 16 The relatively light portion of the A band of skeletal muscle Select the correct response: is light because of the presence of thin filaments. has thick filaments but no thin filaments. is the location of the Z disc. marks the boundary between successive sarcomeres.QUESTION 10 Which of the following is not a phase of muscle contraction? O A. Excitation O B. Excitation-Contraction coupling ○ C. Relaxation O D. Contraction-RelaxationQUESTION 43 Organization of Skeletal Muscle 4 The A-bands of the sarcomere represent areas of a. thin filaments b. thick filaments c. thin and thick filaments d. filament attachment
- QUESTION 16 If the concentration of calcium ion (Ca2*) in the cytosol of a skeletal muscle cell is low, then troponin covers the actin binding sites on the thick filament troponin holds the myosin light chains in a strained conformation tropomyosin prevents the cross-bridges from being energized tropomyosin covers the myosin binding sites on the thin filamentQUESTION 19 Which of the following is when muscle contraction occurs with a single electrical shock? O A. Fused tetanus O B. Twitch O C. Summation O D. Complete tetanusQuestion 1. Describe an action potential in a muscle fiber in detail, know the changes in voltage starting from RMP. Question 2. What is the voltage that causes the sarcoplasmic reticulum to release calcium ions into the cell? Which integral membrane protein is responsible Question 3.What happens to a muscle fiber’s membrane (sarcolemma) once the motor neuron releases theneurotransmitter listed above? What is the change in voltage in the motor end plate? Question 4. Describe how is acetylcholine (neurotransmitter) is released from the synaptic knobs of motor neurons and how it activatesskeletal muscle. Please please please help with these questions, so so srry I know its a lot i am just really stuck! Thank youuuuuu.
- Question 10. Why does the sarcomere length appear to shorten (from Z line to Z line) when a muscle contracts?QUESTION 16 Which of the following term does not fit with smooth muscle? O A. Fusiform O B. Dense bodies O C. Multinucleated O D. CalmodulinQuestion 4 of 16 The physiologic event that takes place at the sarcolemma of a skeletal muscle cell is the Select the correct response: propagation of an action potential. crossbridge cycling. binding of calcium by troponin. release of Ca2+.