Homework Answers
Answer:- Once maximum muscle tension is achieved, no ATP is required to maintain that level of tension.
Explanation:-ATP is required during muscle contraction during the following steps: when Calcium pumped back in by Ca2+ ATPase pump, when Myosin heads release from binding sites and during the myosin heads back into high energy formation. This ATP is required to maintain that level of tension even when maximum muscle tension is achieved.
Answer:-Individual twitches in the same fiber can summate.
Explanation:- In skeletal muscle, twitch is a minimum unit of contraction caused by a single action potential. Summation occurs when the muscle fiber has not completely relaxed and the next contraction is stronger than normal. Therefore, the range of responses to different levels of stimulation depends on individual twitches in the same fiber can summate.
Answer:-Tetanus
Explanation:- Tetanus refers to sustained muscle tension due to very frequent stimuli. It occurs when a sustained reaction that lacks relaxation and summation of frequent muscle twitches to give maximum contraction.
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Which statement about muscle contractions is false? O An action potential in the muscle...
Question 3 0.4 pts A muscle is stimulated to contract by delivering a continuous stream of...
Question 3 0.4 pts A muscle is stimulated to contract by delivering a continuous stream of supramaximal (above maximal) external stimuli to the membranes of the muscle fibers. What will be the likely consequence of this stimulation if it continues for about 30 seconds? The muscle will become fatigued and the amount of tension it is generating will gradually decrease. The muscle will sustain a maximal contraction indefinitely. The upstream neurons will stop firing action potentials, so the muscle will...
Review & Practice She Exerci e in Motor wow m Muscle Physiology A Matching w ach...
Review & Practice She Exerci e in Motor wow m Muscle Physiology A Matching w ach on the left with red description on the rich A Resto of wiches ension changes more than length polarization C hating more motor units D. shift in transmembrane potential toward om E. contraction with no relaxation cycles 6. e contraction onse to single stimulus 7. depolarization G. length changes more than tension H. contraction with rapid relaxation cycles I. neurotransmitter time prior to tension...
True or False: The striations in skeletal muscle are formed by the arrangement of thick and...
True or False: The striations in skeletal muscle are formed by the arrangement of thick and thin filaments. 2. True or False: In skeletal muscle cells, the sarcoplasmic reticulum is continuous with the sarcolemma. 3. The interval between two Z lines is called a ________________. 4. At a neuromuscular junction, the space between the plasma membrane of the synaptic terminal and the motor end plate is the __________________. 5. An action potential (electric impulse) is transferred from a...
Question 23 of 35 > Select the statement that describes recruitment in muscle contraction. More motor...
Question 23 of 35 > Select the statement that describes recruitment in muscle contraction. More motor neurons and larger motor units are activated to stimulate a greater number of muscle fibers for a stronger muscle contraction. Neurotransmitters from the synaptic terminal of a motor neuron stimulate an action potential in the muscle fiber. O An increasing number of motor neurons are connected to the muscle fiber as a muscle grows and becomes stronger. The contraction of muscle fibers in one...
Flag question "All or none" applies to Select one: a. individual muscle fibers O b. muscle...
Flag question "All or none" applies to Select one: a. individual muscle fibers O b. muscle bundles Clear my choice Which of the following fibers would you expect to find in higher concentration in the postural muscles? Select one: O a. fast twitch O b. slow twitch Which of the following describes skeletal muscle relaxation? Select one: O a. Ca+2 transported into SR O b. action potential causes release of neurotransmitter O C. ATP required O d. Ca+2 binds to...
QUESTION 7 What happens (immediately) if T-tubules blocked in skeletal muscle action potential increased an action...
QUESTION 7 What happens (immediately) if T-tubules blocked in skeletal muscle action potential increased an action potential blocked from progressing in fibril Myosin phosphatase in muscle O4(MP) activated d. inactivated QUESTION 8 Can be activated by stretch receptors (best answer only) a. Skeletal muscle Ob. smooth muscle Oc. myosin light chain phosphataso Od. A and B QUESTION 9 Action potential leads to activation of neurotransmitter in muscle answer true or false a true b. false c. not sure od silly...
10) When a muscle fiber enters fatigue, which metabolite below typically does NOT significantly change in...
10) When a muscle fiber enters fatigue, which metabolite below typically does NOT significantly change in concentration? A) ATP B) P G Ca2+ D) Lactic acid E) K* 11) Which is the most accurate definition of a motor unit? A) The mimimum number of muscle fibers required to move a load B) The number of crossbridges formed in a given length of muscle fiber C) The number of muscles innervated by a single nerve D) One motor neuron and all...
1. Explain the steps involved in muscle contraction starting from stimulation of the sciatic nerve (somatic...
1. Explain the steps involved in muscle contraction starting from stimulation of the sciatic nerve (somatic motor neuron) to contraction of the muscle fibers within the gastrocnemius. Be sure to include any movements of ions, neurotransmitters, myofilaments and other relevant structures/particles in your answer. (3 pts) 2. Why do we see a graded response (tension increasing) in single muscle twitch when increasing the voltage (strength) of the stimulus that is applied? Was there a point at which maximal tension was...
number 17-20 10. A Muscle fiber is made up of mabcils 11. Myofibrils are composed of...
number 17-20
10. A Muscle fiber is made up of mabcils 11. Myofibrils are composed of a series of repeated functional units calledSarComeces, which runs from z to z line. Within the myofibrils there are thin and thick myofilaments called achna and muosnSliding of these two myofilaments leads to the contraction of muscles. The thin myofilaments are composed of actinteeamjesinand troponin 12. What are the five physiological characteristics of muscles? hi 13. The junction between a motor nerve and a...
Choose best answer 1. The primary movement of ions across the sarcolemma during an action potential...
Choose best answer 1. The primary movement of ions across the sarcolemma during an action potential that stimulates a skeletal muscle fiber to contract is: a. sodium inward and potassium outward b. sodium outward and potassium inward c. both sodium and potassium inward d. both sodium and potassium outward 2. The chemical substance that transmits the electrical impulse from the alpha motor neuron to the sarcolemma of the muscle fiber is: a. norepinephrine b. adrenalin c. beta-endorphin d. acetylcholine 3....
Question 3 0.4 pts A muscle is stimulated to contract by delivering a continuous stream of supramaximal (above maximal) external stimuli to the membranes of the muscle fibers. What will be the likely consequence of this stimulation if it continues for about 30 seconds? The muscle will become fatigued and the amount of tension it is generating will gradually decrease. The muscle will sustain a maximal contraction indefinitely. The upstream neurons will stop firing action potentials, so the muscle will...
Review & Practice She Exerci e in Motor wow m Muscle Physiology A Matching w ach on the left with red description on the rich A Resto of wiches ension changes more than length polarization C hating more motor units D. shift in transmembrane potential toward om E. contraction with no relaxation cycles 6. e contraction onse to single stimulus 7. depolarization G. length changes more than tension H. contraction with rapid relaxation cycles I. neurotransmitter time prior to tension...
Question 23 of 35 > Select the statement that describes recruitment in muscle contraction. More motor neurons and larger motor units are activated to stimulate a greater number of muscle fibers for a stronger muscle contraction. Neurotransmitters from the synaptic terminal of a motor neuron stimulate an action potential in the muscle fiber. O An increasing number of motor neurons are connected to the muscle fiber as a muscle grows and becomes stronger. The contraction of muscle fibers in one...
Flag question "All or none" applies to Select one: a. individual muscle fibers O b. muscle bundles Clear my choice Which of the following fibers would you expect to find in higher concentration in the postural muscles? Select one: O a. fast twitch O b. slow twitch Which of the following describes skeletal muscle relaxation? Select one: O a. Ca+2 transported into SR O b. action potential causes release of neurotransmitter O C. ATP required O d. Ca+2 binds to...
QUESTION 7 What happens (immediately) if T-tubules blocked in skeletal muscle action potential increased an action potential blocked from progressing in fibril Myosin phosphatase in muscle O4(MP) activated d. inactivated QUESTION 8 Can be activated by stretch receptors (best answer only) a. Skeletal muscle Ob. smooth muscle Oc. myosin light chain phosphataso Od. A and B QUESTION 9 Action potential leads to activation of neurotransmitter in muscle answer true or false a true b. false c. not sure od silly...
10) When a muscle fiber enters fatigue, which metabolite below typically does NOT significantly change in concentration? A) ATP B) P G Ca2+ D) Lactic acid E) K* 11) Which is the most accurate definition of a motor unit? A) The mimimum number of muscle fibers required to move a load B) The number of crossbridges formed in a given length of muscle fiber C) The number of muscles innervated by a single nerve D) One motor neuron and all...
1. Explain the steps involved in muscle contraction starting from stimulation of the sciatic nerve (somatic motor neuron) to contraction of the muscle fibers within the gastrocnemius. Be sure to include any movements of ions, neurotransmitters, myofilaments and other relevant structures/particles in your answer. (3 pts) 2. Why do we see a graded response (tension increasing) in single muscle twitch when increasing the voltage (strength) of the stimulus that is applied? Was there a point at which maximal tension was...
number 17-20
10. A Muscle fiber is made up of mabcils 11. Myofibrils are composed of a series of repeated functional units calledSarComeces, which runs from z to z line. Within the myofibrils there are thin and thick myofilaments called achna and muosnSliding of these two myofilaments leads to the contraction of muscles. The thin myofilaments are composed of actinteeamjesinand troponin 12. What are the five physiological characteristics of muscles? hi 13. The junction between a motor nerve and a...
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