what is the energy source used for muscle contraction? how does recruitment of motor units work?...
Homework Answers
ANSWER :
Energy is required in the form of adenosine triphosphate (ATP) for muscle contraction and can be resynthesize from creatine phosphate (CP) and muscle glycogen, once depleted.
During the recruitment process of muscles, additional muscle fibres present in a motor unit activated (contract) to increase the contractile strength of muscle simultaneously to generate high amount of force when stimulates via motor neuron.
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what is the energy source used for muscle contraction? how does recruitment of motor units work?...
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...
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...
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...
Choose any and all appropriate answers: How is the muscular contraction stopped (i.e.: how does a muscle relax after contraction)? The brain stops sending the nerve impulse that commands the muscle to...
Choose any and all appropriate answers: How is the muscular contraction stopped (i.e.: how does a muscle relax after contraction)? The brain stops sending the nerve impulse that commands the muscle to contract, interrupting communication at the neuromuscular junction Acetylcholineesterase (AChE) is released into the synaptic cleft to destroy any remaining Acetylcholine No mechanism is necessary. When the antagonist begins to contract, it forces relaxation and stretch of the agonist muscle. Relaxation occurs as the myosin heads are "snapped" off...
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...
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...
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...
Explain ALL 5 If sodium ions were not present, what would happen in muscle signaling? (1...
Explain ALL
5 If sodium ions were not present, what would happen in muscle signaling? (1 POINTS) O Acetylcholine would not be released. O Neurotransmitters would not be activated. O Fewer action potentials would be propagated. O The primary motor cortex would not activate an alpha motor neuron. 6 What is included in the appendicular skeleton? (1 POINTS) O Bones arranged around the central axis of the body O Bones that support and move the appendages O Skull O Ossicles...
1. (2 points) If you were given a microscope slide with an unknown type of muscle...
1. (2 points) If you were given a microscope slide with an unknown type of muscle tissue, what features would you look for to determine whether the tissue was smooth muscle or skeletal muscle? Give 2 characteristics that would allow you to distinguish between these tissue types. Be sure to state which type of muscle has the characteristics you describe.) 2. Give 3 examples of different types of connective tissues found within the body and briefly note one function of...
please answer within 5 mins! 46) Which of the following is referred to as the period...
please answer within 5 mins!
46) Which of the following is referred to as the period of lost excitability in skeletal muscle fibers? a) refractory period b) contraction period c) latent period d) relaxation period e) wave summation 47) Increasing the number of active motor units within a skeletal muscle is called a) wave summation. b) fused tetanus. c) motor unit recruitment. d) muscle tone. e) flaccidity. 48) Which of the following microscopic structures is only found in the cardiac...
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...
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...
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...
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...
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...
Explain ALL
5 If sodium ions were not present, what would happen in muscle signaling? (1 POINTS) O Acetylcholine would not be released. O Neurotransmitters would not be activated. O Fewer action potentials would be propagated. O The primary motor cortex would not activate an alpha motor neuron. 6 What is included in the appendicular skeleton? (1 POINTS) O Bones arranged around the central axis of the body O Bones that support and move the appendages O Skull O Ossicles...
1. (2 points) If you were given a microscope slide with an unknown type of muscle tissue, what features would you look for to determine whether the tissue was smooth muscle or skeletal muscle? Give 2 characteristics that would allow you to distinguish between these tissue types. Be sure to state which type of muscle has the characteristics you describe.) 2. Give 3 examples of different types of connective tissues found within the body and briefly note one function of...
please answer within 5 mins!
46) Which of the following is referred to as the period of lost excitability in skeletal muscle fibers? a) refractory period b) contraction period c) latent period d) relaxation period e) wave summation 47) Increasing the number of active motor units within a skeletal muscle is called a) wave summation. b) fused tetanus. c) motor unit recruitment. d) muscle tone. e) flaccidity. 48) Which of the following microscopic structures is only found in the cardiac...
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