relate motor units activation with muscle tension, duration of activity and load.
Homework Answers
A larger motor unit contains a single neuron and it innervates many muscle fibres...these are small fibres....Activation of these fibres create a small tension in the fibres...
Motor neurons are active means they have high action potential frequency..This is achieved by increasing grip strength thereby increasing active potential frequency and active neurons
Tensions generated across motor neuron until sufficient force enabled to move a load..once it crosses sufficient force...then it will stop recruitment.When smaller loads are used...fatigues resistant muscle fibres will be bearing the load..
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relate motor units activation with muscle tension, duration of
activity and load.
what is the energy source used for muscle contraction? how does recruitment of motor units work?...
what is the energy source used for muscle contraction? how does recruitment of motor units work? do all muscle fibers in a motor unit contract every time the somatic motor neuron stimulates it?
Acetylcholine is a common neurotransmitter released at the synapse. Predict the consequences for muscle activation of...
Acetylcholine is a common neurotransmitter released at the synapse. Predict the consequences for muscle activation of decreased acetylcholinesterase activity (degrades acetylcholine at synapses) at nerve-muscle synapses.
Match the descriptions with the correct types of motor units. A Type Recruited last .Type lIA Contains Fast Muscle...
Match the descriptions with the correct types of motor units. A Type Recruited last .Type lIA Contains Fast Muscle Fibers that use Aerobic respiration C.Type IB Contains muscle fibers used for routine movements Contains muscle fibers with the lowest myoglobin content Contains muscle fibers with the slowest contraction speed Have slow and relatively weak contractions
Match the descriptions with the correct types of motor units. A Type Recruited last .Type lIA Contains Fast Muscle Fibers that use Aerobic respiration C.Type...
Motor Units Physiology So that we don't smash an egg when we pick it up, motor units are generally recruited in which...
Motor Units Physiology So that we don't smash an egg when we pick it up, motor units are generally recruited in which order: 1) motor units with the highest (more positive) threshold neuron and the fewest muscle fibers are generally recruited first 2) motor units with the highest (more positive) threshold neuron and the most muscle fibers are generally recruited first 3) motor units with the lowest (most negative) threshold neuron and the fewest muscle fibers are generally recruited first...
all 3? Which statement about muscle contractions is false? O An action potential in the muscle...
all 3?
Which statement about muscle contractions is false? O An action potential in the muscle cell activates contraction by releasing Car within the muscle. O A single action potential at the neuromuscular junction is sufficient to cause a muscle to twitch. O Summation of twitches leads to a graded increase in the tension that can be generated by a single muscle fiber. The tension generated by a muscle can be varied by controlling how many of its motor units...
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...
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...
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...
Match (A-J) with the terms below. Use each phrase only once. (10 points.) Gamma Motor...
Match (A-J) with the terms below. Use each phrase only once. (10 points.) Gamma Motor Neurons _______ Alpha Motor Neurons _______ Extrafusal Muscle Fibers _______ Intrafusal Muscle Fibers _______ Golgi Tendon Organ _______ Muscle Spindle _______ Alpha Gamma Co-activation _______ Inhibitory interneurons _______ Muscle Spindle Sensory Neuron _______ Crossed Extensor Reflex _______ A. Responds primarily to excess tension a muscle develops during isometric contraction and causes a relaxation reflex. B....
Match the descriptions with the correct types of motor units. A Type Recruited last .Type lIA Contains Fast Muscle Fibers that use Aerobic respiration C.Type IB Contains muscle fibers used for routine movements Contains muscle fibers with the lowest myoglobin content Contains muscle fibers with the slowest contraction speed Have slow and relatively weak contractions
Match the descriptions with the correct types of motor units. A Type Recruited last .Type lIA Contains Fast Muscle Fibers that use Aerobic respiration C.Type...
all 3?
Which statement about muscle contractions is false? O An action potential in the muscle cell activates contraction by releasing Car within the muscle. O A single action potential at the neuromuscular junction is sufficient to cause a muscle to twitch. O Summation of twitches leads to a graded increase in the tension that can be generated by a single muscle fiber. The tension generated by a muscle can be varied by controlling how many of its motor units...
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...
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...
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...
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