Homework Answers
Answer: a) more motor neurons and larger motor units are activated to stimulate a greater number of muscle fibers for a stronger muscle contraction.
Motor unit recruitment involves activation of more muscles in order to achieve stronger contractions. This involves activation of motor neurons as well as all the muscle fibers attached to it.
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Question 23 of 35 > Select the statement that describes recruitment in muscle contraction. More motor...
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?
Which statement about motor neurons is NOT correct? motor neuron pools innervating two different muscles, such...
Which statement about motor neurons is NOT correct? motor neuron pools innervating two different muscles, such as biceps and triceps, have separate non- overlapping locations in the ventral gray matter arranged in longitudinal columns motoneurons in a motor pool are recruited (activated) in rank order according to their size, from small to large small a-motor neurons tepd to innervate a large number of thick, pale muscle fibers that generate large forces but fatigue quickly an equal synaptic current will elicit...
Check your understanding of muscle fiber recruitment by reading the following scenario and then answering the...
Check your understanding of muscle fiber recruitment by reading the following scenario and then answering the questions. Check your answers when you've finished. Scott is a swimmer on the university swim team. Before each competition, he spends some time walking around the pool area, getting psyched up for the event. He swings his arms a little shakes his legs, and just generally tries to loosen up. Soon he's in position on the starting block, waiting for the sound of the...
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...
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...
1. What channels or carriers are NOT found at the axon to the axon terminal? Select...
1. What channels or carriers are NOT found at the axon to the axon terminal? Select one: a. Na+ leaky channels b. Cl- gated channels c. Na+ gated channels d. Na+-K+ ATPase e. None of the above 2. What is TRUE about action potential in the neuron? There may be more than one answer. Select one or more: a. At resting membrane potential (-70mV), the inactivation gate of the Na+ channel is closed while the activation gate is opened. b....
Question 3 1 pts Many nerves, for example, motor neurons used in muscle contraction, are wrapped...
Question 3 1 pts Many nerves, for example, motor neurons used in muscle contraction, are wrapped in myelin, a sheath of repeated units of lipid bilayers and proteins. The effect of myelin is to reduce the amount of ions leaking out the membrane, which therefore reduces the degree of amplification of a signal required during de- and repolarization, and, hence, increases the voltage signal speed. With regard to our model circuit, a myelinated axon simply can be represented by an...
Question 1 of 10 10 Points Which of the following secretes hormones? • O A. Hypothalamus...
Question 1 of 10 10 Points Which of the following secretes hormones? • O A. Hypothalamus • B. Thyroid • O C. Liver • D. Appendix Reset Selection Signals from the brain and spinal cord going to muscles and glands go through • • • A. Motor neurons B. Sensory neurons C. Hypothalamus • OD. Receptors A junction between neurons through which electrical signals pass through are known as . A. Synapses B. Axons • O C. Neurotransmitter D. Myelin...
KEY TERMS March the numbered form with the definition that is it be definition the responding...
KEY TERMS March the numbered form with the definition that is it be definition the responding sumber in front of the appropriate 40. excitatory postsynaptic potential 21. resting potential 22 on leakage channels 23. equilibrium potential -24 graded potential 25. gated ion channels 26. depolarization 27. hyperpolarization Sensory neurons 2. central nervous system 3. motor neurons 4. intercurons 5. peripheral nervous system 6. somatic motor neurons *7. autonomic motor neurons 8. sympathetic 9. parasympathetic 10. cell body all dendrites 12....
Which statement about motor neurons is NOT correct? motor neuron pools innervating two different muscles, such as biceps and triceps, have separate non- overlapping locations in the ventral gray matter arranged in longitudinal columns motoneurons in a motor pool are recruited (activated) in rank order according to their size, from small to large small a-motor neurons tepd to innervate a large number of thick, pale muscle fibers that generate large forces but fatigue quickly an equal synaptic current will elicit...
Check your understanding of muscle fiber recruitment by reading the following scenario and then answering the questions. Check your answers when you've finished. Scott is a swimmer on the university swim team. Before each competition, he spends some time walking around the pool area, getting psyched up for the event. He swings his arms a little shakes his legs, and just generally tries to loosen up. Soon he's in position on the starting block, waiting for the sound of the...
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...
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 3 1 pts Many nerves, for example, motor neurons used in muscle contraction, are wrapped in myelin, a sheath of repeated units of lipid bilayers and proteins. The effect of myelin is to reduce the amount of ions leaking out the membrane, which therefore reduces the degree of amplification of a signal required during de- and repolarization, and, hence, increases the voltage signal speed. With regard to our model circuit, a myelinated axon simply can be represented by an...
Question 1 of 10 10 Points Which of the following secretes hormones? • O A. Hypothalamus • B. Thyroid • O C. Liver • D. Appendix Reset Selection Signals from the brain and spinal cord going to muscles and glands go through • • • A. Motor neurons B. Sensory neurons C. Hypothalamus • OD. Receptors A junction between neurons through which electrical signals pass through are known as . A. Synapses B. Axons • O C. Neurotransmitter D. Myelin...
KEY TERMS March the numbered form with the definition that is it be definition the responding sumber in front of the appropriate 40. excitatory postsynaptic potential 21. resting potential 22 on leakage channels 23. equilibrium potential -24 graded potential 25. gated ion channels 26. depolarization 27. hyperpolarization Sensory neurons 2. central nervous system 3. motor neurons 4. intercurons 5. peripheral nervous system 6. somatic motor neurons *7. autonomic motor neurons 8. sympathetic 9. parasympathetic 10. cell body all dendrites 12....
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