Modified Masteringa&p with Pearson Etext -- Standalone Access Card -- For Essentials of Human Anatomy & Physiology
11th Edition
ISBN: 9780321936981
Author: Marieb Elaine Nicpon Marieb
Publisher: Pearson College Div
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Chapter 6, Problem 35CAQ
Chemical A binds and blocks acetylcholine recep-tors of muscle cells. Chemical B floods the cyto-plasm of muscle cells with calcium ions. Which chemical would make the best muscle relaxant, and why?
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In theory, could a muscle cell get away with having only acetylcholine-gated cation channels, which would serve the dual purpose of receiving neurotransmitter signals and propagating action potentials? Why or why not?
If you introduced a chemical into a muscle fiber that blocked the voltage-gated calcium channels in the sarcoplasmic reticulum, what effect if any, would this have on the contraction of that muscle fiber?
Which of the following causes ( the state of ) rigor in skeletal muscle ?a) lack of atp
b) decrease of intracellular ca2plus
c) increase in intracellular ca2+
d) lack of action potential in motor neurons
Chapter 6 Solutions
Modified Masteringa&p with Pearson Etext -- Standalone Access Card -- For Essentials of Human Anatomy & Physiology
Ch. 6 - More than one choice may apply. Identify the...Ch. 6 - Prob. 2MCCh. 6 - More than one choice may apply. Which of the...Ch. 6 - Prob. 4MCCh. 6 - Prob. 5MCCh. 6 - 6. Which of the following muscles attach to the...Ch. 6 - Which of these thigh muscles causes movement at...Ch. 6 - 8. Which of the following insert on the...Ch. 6 - What is major function of muscle?Ch. 6 - Compare skeletal, smooth, and cardiac muscles in...
Ch. 6 - Prob. 11SAECh. 6 - Prob. 12SAECh. 6 - Prob. 13SAECh. 6 - Describe how a neurotransmitter is released into...Ch. 6 - Prob. 15SAECh. 6 - Prob. 16SAECh. 6 - Prob. 17SAECh. 6 - Prob. 18SAECh. 6 - Prob. 19SAECh. 6 - Prob. 20SAECh. 6 - If you were alternately contracting and relaxing...Ch. 6 - The sternocleidomastoid muscles help to flex the...Ch. 6 - Prob. 23SAECh. 6 - Name the prime mover of elbow flexion. Name its...Ch. 6 - Prob. 25SAECh. 6 - The hamstring and quadriceps muscle groups are...Ch. 6 - 27. What two-bellied muscle makes up the calf...Ch. 6 - 28. What happens to muscles when they are...Ch. 6 - Prob. 29SAECh. 6 - 30. Should a triathlete engage in aerobic or...Ch. 6 - Prob. 31CAQCh. 6 - Phil loved to play squash. During a particularly...Ch. 6 - While painting her house, Susan fell off the...Ch. 6 - Prob. 34CAQCh. 6 - 37. Chemical A binds and blocks acetylcholine...
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- After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses down its concentration gradient into the muscle cytoplasm. This result is rigor mortis----an unbreakable state of muscle contraction that stiffens the body for a few days until muscles begin to decay. Explain why this contraction occurs.arrow_forwardWhich component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striationsarrow_forwardThe _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filamentarrow_forward
- Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?arrow_forwardSkeletal 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_forward
- The single-fiber twitch experiments shown here were generated by stimulating the muscle cell membranes to threshold with an electrode and measuring the resulting action potential and force. How would the results differ if Ca21 were removed from the extracellular solution just before the electrical stimulus was applied?arrow_forwardhen an action potential arrives at the nerve terminal of a neuromuscular junction, which of the following statements best describes the events that occur? Depolarisation of the nerve terminal causes the release of ACh which activates nicotinic receptors on the skeletal muscle membrane to cause Ca2+ entry and muscle contraction. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which activates voltage-gated Na+ channels at the end-plate. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores causing the release of ACh which binds to muscarinic receptors at the end plate. Depolarisation of the nerve terminal opens voltage-gated Ca2+ channels, Ca2+ entry brings vesicles containing ACh to the membrane which form fusion pores…arrow_forwardSuppose a substance were to prevent calcium ions from being returned to the sarcoplasmic reticulum in a skeletal muscle cell. Predict how a muscle cell would respond to being exposed to the supposed compound after a single stimulus by the motor neuronarrow_forward
- Acetylcholinesterase is the enzyme that breaks down and inactivates acetylcholine. Some nerve gases used as chemical weapons block acetylcholinesterase. What effect would such nerve gases have on muscle contraction?arrow_forwardWhich of the following statements about skeletal muscle is CORRECT? Select one: a. An increase in Na+ concentration in the cytosol starts muscle filament sliding. b. The muscle is non-striated and involuntary. c. The muscle is involved in shivering thermogenesis. d. The muscle contracts in response to parasympathetic stimulation. e. The muscle contracts in response to hormones.arrow_forwardMotor neurons innervate muscle fibers at specialized synapses called_______ . The release of acetylcholine at these synapses ultimately triggers an action potential in the muscle fiber, which invades the interior of the fiber through_____ and stimulates the release of calcium ions from the_______ .arrow_forward
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