© 2018 Pearson Education, Inc.

What are the main contributors of negative charges within a muscle cell? Sodium ions Potassium ions Proteins Chloride ions Answer: c © 2018 Pearson Education, Inc.

What are the main contributors of negative charges within a muscle cell? Sodium ions Potassium ions Proteins Chloride ions © 2018 Pearson Education, Inc.

Which of these surrounds a muscle fascicle? Perimysium Epimysium Endomysium Deep fascia Answer: a © 2018 Pearson Education, Inc.

Which of these surrounds a muscle fascicle? Perimysium Epimysium Edomysium Deep fascia © 2018 Pearson Education, Inc.

What is the role of myosatellite cells? They provide a source of calcium. They repair damaged muscle tissue. They produce ACh receptors. They lead to the relaxation of muscle. Answer: b © 2018 Pearson Education, Inc.

What is the role of myosatellite cells? They provide a source of calcium. They repair damaged muscle tissue. They produce ACh receptors. They lead to the relaxation of muscle. © 2018 Pearson Education, Inc.

Which of the following contains both thick and thin filaments? I band H zone Z line A band Answer: d © 2018 Pearson Education, Inc.

Which of the following contains both thick and thin filaments? I band H zone Z line A band © 2018 Pearson Education, Inc.

Which of the following contain gated calcium channels to activate contraction? Transverse tubules Longitudinal tubules Terminal cisternae Neuromuscular junctions Answer: c © 2018 Pearson Education, Inc.

Which of the following contain gated calcium channels to activate contraction? Transverse tubules Longitudinal tubules Terminal cisternae Neuromuscular junctions © 2018 Pearson Education, Inc.

Which of these is the part of the muscle fiber stimulated by a motor neuron? Synaptic cleft Motor end plate Junctional fold Sarcolemma Answer: b © 2018 Pearson Education, Inc.

Which of these is the part of the muscle fiber stimulated by a motor neuron? Synaptic cleft Motor end plate Junctional fold Sarcolemma © 2018 Pearson Education, Inc.

How is an action potential created? The flow of potassium across the sarcolemma The hydrolysis of ATP The flow of sodium across the sarcolemma The flow of calcium across the sarcolemma Answer: c © 2018 Pearson Education, Inc.

How is an action potential created? The flow of potassium across the sarcolemma The hydrolysis of ATP The flow of sodium across the sarcolemma The flow of calcium across the sarcolemma © 2018 Pearson Education, Inc.

What chemical is secreted by motor neurons at neuromuscular junctions in skeletal muscle? Acetylcholine Acetylcholinesterase Sodium Calcium Answer: a © 2018 Pearson Education, Inc.

What chemical is secreted by motor neurons at neuromuscular junctions in skeletal muscle? Acetylcholine Acetylcholinesterase Sodium Calcium © 2018 Pearson Education, Inc.

Which of the following ends the stimulation of a muscle fiber? Calcium AChE Sodium ACh Answer: b © 2018 Pearson Education, Inc.

Which of the following ends the stimulation of a muscle fiber? Calcium AChE Sodium ACh © 2018 Pearson Education, Inc.

What type of channels allow for the propagation of an action potential across the surface of a muscle cell? Voltage gated Ligand gated Mechanically gated Leaky channels Answer: a © 2018 Pearson Education, Inc.

What type of channels allow for the propagation of an action potential across the surface of a muscle cell? Voltage gated Ligand gated Mechanically gated Leaky channels © 2018 Pearson Education, Inc.

What ion triggers the movement of troponin to expose actin’s active site? Sodium Chloride Calcium Potassium Answer: c © 2018 Pearson Education, Inc.

What ion triggers the movement of troponin to expose actin’s active site? Sodium Chloride Calcium Potassium © 2018 Pearson Education, Inc.

To which of the following does ATP bind? Actin molecules Myosin heads Troponin Tropomyosin Answer: b © 2018 Pearson Education, Inc.

To which of the following does ATP bind? Actin molecules Myosin heads Troponin Tropomyosin © 2018 Pearson Education, Inc.

When is energy released? ATP splits into ADP and P ADP and P bond to form ATP ATP binds to myosin Calcium binds to troponin Answer: a © 2018 Pearson Education, Inc.

When is energy released? ATP splits into ADP and P ADP and P bond to form ATP ATP binds to myosin Calcium binds to troponin © 2018 Pearson Education, Inc.

Which of the following contributes to rigor mortis? The deterioration of the SR Increased activity of calcium pumps in the SR Decreased AChE activity Destruction of ACh receptors Answer: a © 2018 Pearson Education, Inc.

Which of the following contributes to rigor mortis? The deterioration of the SR Increased activity of calcium pumps in the SR Decreased AChE activity Destruction of ACh receptors © 2018 Pearson Education, Inc.

Which of the following stays the same length when filaments slide? I band H zone Sarcomere A band Answer: d © 2018 Pearson Education, Inc.

Which of the following stays the same length when filaments slide? I Band H zone Sarcomere A band © 2018 Pearson Education, Inc.

In what type of muscle contraction does tension rise and the skeletal muscle length shorten, moving a load? Concentric contraction Eccentric contraction Isometric contraction Rigor contraction Answer: a © 2018 Pearson Education, Inc.

In what type of muscle contraction does tension rise and the skeletal muscle length shorten, moving a load? Concentric contraction Eccentric contraction Isometric contraction Rigor contraction © 2018 Pearson Education, Inc.

When is titin relaxed? Titin always has tension When muscle fibers are stretched When muscle fibers are shortened When muscle fibers are resting Answer: d © 2018 Pearson Education, Inc.

When is titin relaxed? Titin always has tension When muscle fibers are stretched When muscle fibers are shortened When muscle fibers are resting © 2018 Pearson Education, Inc.

Which of these occurs when a second stimulus arrives before the muscle relaxes completely? A second, more powerful contraction A second contraction with the same force A second, weaker contraction Treppe Answer: a © 2018 Pearson Education, Inc.

Which of these occurs when a second stimulus arrives before the muscle relaxes completely? A second, more powerful contraction A second contraction with the same force A second, weaker contraction Treppe © 2018 Pearson Education, Inc.

What term refers to a chronic, continual, low-level contraction that keeps muscles firm without producing movement? Treppe Tone Tetanus Twitch Answer: b © 2018 Pearson Education, Inc.

What term refers to a chronic, continual, low-level contraction that keeps muscles firm without producing movement? Treppe Tone Tetanus Twitch © 2018 Pearson Education, Inc.

What type of contraction is most susceptible to muscle tears? Eccentric contraction Concentric contraction Asynchronous summation Recruitment Answer: a © 2018 Pearson Education, Inc.

What type of contraction is most susceptible to muscle tears? Eccentric contraction Concentric contraction Asynchronous summation Recruitment © 2018 Pearson Education, Inc.

What is the source of 95 percent of the energy demand for resting muscle? Lactic acid Aerobic metabolism Glycolysis Creatine phosphate Answer: b © 2018 Pearson Education, Inc.

What is the source of 95 percent of the energy demand for resting muscle? Lactic acid Aerobic metabolism Glycolysis Creatine phosphate © 2018 Pearson Education, Inc.

What is the main source of stored energy molecules in a muscle cell? Fat Creatine phosphate Glucose Glycogen Answer: d © 2018 Pearson Education, Inc.

What is the main source of stored energy molecules in a muscle cell? Fat Creatine phosphate Glucose Glycogen © 2018 Pearson Education, Inc.

What advantage does ATP production via glycolysis give a muscle? ATP production is faster Fatigue resistant Lactic acid increases efficiency Limits use of glycogen reserves Answer: a © 2018 Pearson Education, Inc.

What advantage does ATP production via glycolysis give a muscle? ATP production is faster Fatigue resistant Lactic acid increases efficiency Limits use of glycogen reserves © 2018 Pearson Education, Inc.

When will muscle fibers typically rely on glycogen reserves and aerobic respiration to meet energy needs? During rest During moderate activity During peak activity During muscle fatigue Answer: b © 2018 Pearson Education, Inc.

When will muscle fibers typically rely on glycogen reserves and aerobic respiration to meet energy needs? During rest During moderate activity During peak activity During muscle fatigue © 2018 Pearson Education, Inc.

Which type of muscle fiber has the highest concentration of myoglobin? Slow (oxidative) fibers Intermediate fibers Fast (glycolytic) fibers Fast (oxidative) fibers Answer: a © 2018 Pearson Education, Inc.

Which type of muscle fiber has the highest concentration of myoglobin? Slow (oxidative) fibers Intermediate fibers Fast (glycolytic) fibers Fast (oxidative) fibers © 2018 Pearson Education, Inc.

Where does the Cori cycle occur? Kidneys Muscles Liver Pancreas Answer: c © 2018 Pearson Education, Inc.

Where does the Cori cycle occur? Kidneys Muscles Liver Pancreas © 2018 Pearson Education, Inc.