Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 35, Problem 7TY
Summary Introduction
Introduction:
The overstimulation of a muscle fiber is prevented by the role of the enzyme acetylcholinesterase (ACh). The enzyme breaks down excess ACh into inactive molecules in the synapse, and this ends neurotransmission.
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Which one of the following statements is the best description of a motor unit?
A single α-motor neuron with all of the muscle fibres it connects to.
The activity in a single muscle fibre.
The activity in a single muscle.
A single action potential conducted along a motor axon.
Golgi tendon organs are most sensitive to
muscle tension.
absolute joint position.
muscle contraction frequency.
muscle fatigue.
Which of the following statements regarding summation in skeletal muscle fibers is true?
Incomplete tetanus allows complete relaxation between stimulation of successive twitches
Complete tetanus does not have any relaxation between stimulation of successive twitches
All of these are correct
The development of force in a muscle twitch is all or none
Chapter 35 Solutions
Principles of Biology
Ch. 35.1 - Prob. 1CCCh. 35.1 - Prob. 1TYKCh. 35.1 - Prob. 2TYKCh. 35.2 - Prob. 1CCCh. 35.2 - Rigor mortis is the condition that occurs shortly...Ch. 35.2 - Prob. 1BCCh. 35.2 - Prob. 3CCCh. 35.2 - Prob. 2BCCh. 35.2 - Prob. 1TYKCh. 35.2 - Prob. 2TYK
Ch. 35.3 - Prob. 1TYKCh. 35.4 - Prob. 1TYKCh. 35.4 - Prob. 2TYKCh. 35 - Prob. 1TYCh. 35 - Which, if any, of the following is not a function...Ch. 35 - Prob. 3TYCh. 35 - Prob. 4TYCh. 35 - Prob. 5TYCh. 35 - During cross-bridge cycling, binds to _________,....Ch. 35 - Prob. 7TYCh. 35 - Prob. 8TYCh. 35 - Prob. 9TYCh. 35 - Prob. 10TYCh. 35 - Prob. 1CCQCh. 35 - Prob. 2CCQCh. 35 - Prob. 3CCQCh. 35 - Discuss the structure and function of the two...Ch. 35 - Prob. 2CBQ
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- Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the abovearrow_forwardFigure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.arrow_forwardSkeletal muscle will be released in its contracted (rigor) state when: Group of answer choices ATP is hydrolyzed into forming ADP and inorganic phosphate. ATP binds to the myosin head. ADP is dissociated from the myosin head. ATP binds to the actin G-molecule.arrow_forward
- A motor unit is: A group of muscle cells wrapped in perimysium A group of muscles working in unison A group of muscle cells plus the 1 neuron that innervates them A group of sarcomeres contracting in unisonarrow_forwardWhich of the following sites is not a site of muscle attachment? Greater trochanter, lesser trochanter, gluteal tuberosity, lateral condyle.arrow_forwardWhich of the following correctly states the importance of an action potential to muscle contration? The SR will only release Ca2+ if it has been electrically stimulated. Sarcomeres require a negative electrical charge to start sliding. Actin and myosin must be electrically charged to create a cross-bridge. ATP cannot be split into ADP and Pi without an action potential.arrow_forward
- A motor unit associated with the stimulation of skeletal muscle is designated as a 1:8 motor unit. Which of the following statements is correct? The motor unit consists of one somatic neuron and 8 myofibers (muscle fibers) Each of the myofibers in the motor unit is innervated by more than one neuron It is part of the autonomic nervous system The neuron in the motor unit is an afferent neuronarrow_forwardThe region of the muscle fiber involved in a neuromuscular junction is called the: Group of answer choices Voltage-gated ion channels Synaptic end bulb Synaptic cleft Motor end plate Synaptic vesiclearrow_forwardIn the sliding filament model of muscle contraction, I bands contain sacrcomeres. thin filaments. thick filaments. both thick and thin filaments. myosin. Which of the following is associated with retrograde movement? dynein myosin kinesin tubulin actinarrow_forward
- Which of the following does not occur during the excitation contraction coupling of skeletal muscle? Opening of ryanodine receptor calcium channels Calcium binding to troponin Tropomyosin shifting away from myosin binding sites on the actin An end plate potentialarrow_forwardPart C Which of the following does NOT describe treppe? It is also referred to as the "staircase" effect. An increase in stimulus intensity is required to see the effect. OAn incremental increase in force occurs. A period of relaxation can be seen on the muscle twitch tracing. Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Provide Feedback DE home end insert delete prt scarrow_forwardtrue or fasle : Eccentric muscle contractions at a constant velocity are be considered isokinetic. true or false : Running has a flight phase.arrow_forward
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