Human Anatomy & Physiology
1st Edition
ISBN: 9780805382952
Author: Erin C. Amerman
Publisher: PEARSON
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Textbook Question
Chapter 13, Problem 14CYR
The lower motor neurons that innervate contractile skeletal muscle fibers are called:
a.
b.
c. upper motor neurons.
d.
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When muscle fibers are stimulated so frequently they do not have an opportunity to relax, they are experiencing: a. unfused or incomplete tetanus. b. wave summation. c. fused or complete tetanus. d. twitch.
What type of motor neuron stimulates skeletal muscle fibers to contract by the excitation-contraction mechanism? a. interneuron b. α-motor neuron c. γ-motor neuron d. upper motor neuron
The fast fatigable motor units are used predominantly for which of the following activities?
a. The action potentials fired by alpha motor neurons become slower.
b. Slow twitch muscle fibers show increased myosin ATPase.
c. Fast fatigable motor units are recruited before slow twitch motor units.
d. None of the answers.
e.All of the answers.
Chapter 13 Solutions
Human Anatomy & Physiology
Ch. 13.1 - What two subclasses make up the sensory division...Ch. 13.1 - 2. What is a lower motor neuron? How are upper...Ch. 13.1 - In what ways do the somatic and visceral motor...Ch. 13.1 - What structures are found in a peripheral nerve?Ch. 13.1 - Prob. 5QCCh. 13.1 - Prob. 6QCCh. 13.1 - How are sensations detected in the PNS and...Ch. 13.1 - 8. How are motor impulses transmitted from the...Ch. 13.2 - Prob. 1QCCh. 13.2 - List the Roman numeral, origins, destinations, and...
Ch. 13.2 - List the Roman numeral, origins, destinations, and...Ch. 13.2 - List the 12 pairs of cranial nerves in ascending...Ch. 13.2 - Prob. 5QCCh. 13.3 - Prob. 1QCCh. 13.3 - What are the anterior and posterior rami, and what...Ch. 13.3 - Prob. 3QCCh. 13.3 - Prob. 4QCCh. 13.3 - Prob. 5QCCh. 13.3 - Prob. 6QCCh. 13.4 - 1. What is sensory transduction?
Ch. 13.4 - Prob. 2QCCh. 13.4 - 3. What are the three components of a typical...Ch. 13.4 - Prob. 4QCCh. 13.4 - What is the two-point discrimination threshold,...Ch. 13.4 - What is a dermatome?Ch. 13.4 - 7. Why is visceral pain often perceived as...Ch. 13.5 - 1. What are the main differences between an upper...Ch. 13.5 - 2. What is a motor neuron pool?
Ch. 13.5 - What is the general sequence of events for...Ch. 13.6 - Prob. 1QCCh. 13.6 - 2. How do intrafusal and extrafusal muscle fibers...Ch. 13.6 - Prob. 3QCCh. 13.6 - 4. How do Golgi tendon organs and muscle spindles...Ch. 13.6 - How do polysynaptic and monosynaptic reflex arcs...Ch. 13.6 - Prob. 6QCCh. 13.6 - What are some potential effects of sensory...Ch. 13.6 - How do upper and lower motor neuron disorders...Ch. 13 - Mark the following statements as true or false. If...Ch. 13 - Prob. 2CYRCh. 13 - 3. Define each of the following terms in your own...Ch. 13 - First, write the Roman numeral that corresponds to...Ch. 13 - Prob. 5CYRCh. 13 - Match the following nerves with the structures...Ch. 13 - First-order somatic sensory neurons are...Ch. 13 - Prob. 8CYRCh. 13 - Prob. 9CYRCh. 13 - 10. Merkel cell fibers, tactile corpuscles,...Ch. 13 - 11. Place the following sequence of events for the...Ch. 13 - How do upper and lower motor neurons differ?Ch. 13 - 13. List and describe the basic steps involved in...Ch. 13 - 14. The lower motor neurons that innervate...Ch. 13 - Fill in the blanks:______ detect the degree to...Ch. 13 - Which of the following is the correct order of...Ch. 13 - 17. Mark the following statements as true or...Ch. 13 - Prob. 18CYRCh. 13 - Prob. 1CYUCh. 13 - Prob. 2CYUCh. 13 - Prob. 3CYUCh. 13 - Prob. 1AYKACh. 13 - Jason presents for evaluation after a severe...Ch. 13 - 3. When Mr. Williams goes to the emergency...Ch. 13 - 4. Maria is a 3-year-old who has been diagnosed...Ch. 13 - Another feature of CIPA is anhidrosis, or the...
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- In a skeletal muscle fiber, Ca2+ is released from a. ACh receptors. b. the motor end plate. c. the sarcoplasmic reticulum. d. the sarcolemma and T-tubules.arrow_forwardThe axon terminal releases acetylcholine into the synaptic cleft, which is received by receptors on the motor end plate. Which structure does this describe? a. A sarcomere b. The thick filament c. The neuromuscular junction of a skeletal muscle d. A motor unit e. The varicosity of a smooth muscle cellarrow_forwardThe cross bridges of the sarcomere in skeletal muscle are made up of A. myelin. B. tropomyosin. C. myosin. D. actin. E. myoglobulin. F. troponin.arrow_forward
- The neurotransmitter that initiates events leading to skeletal muscle contraction is A. creatine kinase. B. creatinine. C. norepinephrine. D. acetylcholinearrow_forwardA skeletal muscle motor unit A.Is the number of muscle cells innervated by one motor neuron. B.Is the number of motor neurons innervating one muscle cell. C.Size determines the ability to control a muscle D.Size determines how much a muscle contracts at any one time.arrow_forwardMuscle spindles trigger the muscle to a. lengthen. b. relax. c. shorten. d. remain fixed.arrow_forward
- Delayed onset muscle soreness (DOMS) is most closely associated with which type of muscle action? a. Flurometic b. Isometric c. Anabolic d. Concentric e. Eccentricarrow_forwardA bacterial toxin is known to block the release of ACh at the motor end plate of skeletal muscle. Consequently, a. the skeletal muscle contracts with increasing force. b. the skeletal muscle contracts with increasing frequency. c. the ability to stimulate the muscle is impaired. d. other neurotransmitters would stimulate the muscle.arrow_forwardThe muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous stimulation is still present in the synapse. The activity of ________ helps to remove this neurotransmitter. a. myosin b. action potential c. tropomyosin d. acetylcholinesterasearrow_forward
- To make a muscle contract more strongly,the nervous system can activate more motorunits. This process is calleda. recruitment.b. summation.c. incomplete tetanus.d. twitch.e. concentric contractionarrow_forwardWhich of the following statements is not characteristic of smooth muscles? a.Myosin phosphatase is required for contraction. b.They are able to conduct graded depolarizations. c.They can enter a latch state. d.They can produce graded contractions in response to graded depolarizations.arrow_forwardThe series-elastic component of muscle contraction is responsible for a.increased muscle shortening to successive twitches. b.a time delay between contraction and shortening. c.the lengthening of muscle after contraction has ceased. d.all of these.arrow_forward
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