Laboratory Manual For Human Anatomy & Physiology
4th Edition
ISBN: 9781260159080
Author: Martin, Terry R., Prentice-craver, Cynthia
Publisher: Mcgraw-hill Education,
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Textbook Question
Chapter 10, Problem 4PL
Which of the following conduct action potentials?
- smooth muscle cells
- neurons
- neuroglia
- skeletal muscle cells
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The relaxation of skeletal muscle relies on the activity of the _ which decreases cytoplasmic calcium ion concentration.
acetylcholine receptor
Ca2+
-ATPase pump
ryanodine receptor
Na*/K* ATPase pump
Neurons controlling skeletal muscle contraction are which type?
Multipolar motor neurons
Bipolar sensory neurons
Multipolar sensory neurons
O Unipolar motor neurons
O Unipolar motor neurons
From the following choices, choose the THREE, that would result in prevention of muscle contraction (in other words, which three descriptive changes below would result in flaccid paralysis of a muscle).
exocytosis of acetylcholine is constant, even without action potential
injection of botulinum toxin
calcium cannot be pumped back into the terminal cisternae
acetylcholine receptor remains open to sodium
active sites on actin a permanently exposed
dramatically increase the activity of acetylcholinesterase
calcium cannot bind troponin
Chapter 10 Solutions
Laboratory Manual For Human Anatomy & Physiology
Ch. 10 - Which muscle tissue is under conscious control?...Ch. 10 - Which of the following organs lacks smooth muscle?...Ch. 10 - Which muscle tissue lacks striations? cardiac...Ch. 10 - Which of the following conduct action potentials?...Ch. 10 - Muscles of facial expression are smooth muscles....Ch. 10 - Which muscle tissue is multinucleated? skeletal...Ch. 10 - Prob. 7PLCh. 10 - Both cardiac and skeletal muscle cells are under...Ch. 10 - Match the tissues in column A with the...Ch. 10 - The word fiber is used to describe a structure in...
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- Figure 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_forwardThe _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filamentarrow_forwardDepolarization of the sarcolemma means ________. the inside of the membrane has become Less negative as sodium ions accumulate the outside of the membrane has become less negative as sodium ions accumulate the inside of the membrane has become more negative as sodium ions accumulate the sarcolemma has completely lost any electrical chargearrow_forward
- Nerve impulses first stimulate a skeletal muscle fiber at _______. a. T tubules b. sarcomeres c. neuromuscular junctions d. actin binding sitesarrow_forwardIn the diagram below, label the fine structure of a muscle, down to one of its myofibrils. Identify the basic unit of contraction in a myofibril.arrow_forwardWhich component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striationsarrow_forward
- Which of the following properties is not common to all three muscle tissues? excitability the need for ATP at rest, uses shielding proteins to cover actin binding sites elasticityarrow_forwardWhy do you think a person is able to perform anaerobic exercise (such as lifting and holding a heavy weight) only briefly but can sustain aerobic exercise (such as walking or swimming) for long periods? (Hint: Muscles have limited energy stores.)arrow_forwardHumming birds and rattlesnakes can contract and relax skeletal muscle very quickly, i.e. in 10-20 milliseconds. Which of the following steps must they have shortened to speed up contractions? more brief neuronal action potentials more brief skeletal muscle attion potentials shorter duration of calcium in the cytosol all of the abovearrow_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_forwardWhich 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_forwardWhich of the following statements regarding contraction of skeletal muscle cells is NOT true: (more than one answer may be correct) the myofibrils shorten the thick and thin filaments slide past one another the thin filaments shorten the sarcomeres shorten the thick filaments shortenarrow_forward
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