Question 1

The elevated oxygen consumption relative to activity level after exercise has ended is called

Accepted Answer

A)  oxygen deficit. 
B)  oxygen debt. 
C)  oxygen repayment. 
D)  recovery oxygen consumption. 
E)  anaerobic recovery. 
A)  oxygen deficit. 
B)  oxygen debt. 
C)  oxygen repayment. 
D)  recovery oxygen consumption. 
E)  anaerobic recovery.

Question 2

Which type of muscle tissue causes contraction of the heart?

Accepted Answer

A)  skeletal muscle 
B)  smooth muscle 
C)  cardiac muscle 
A)  skeletal muscle 
B)  smooth muscle 
C)  cardiac muscle

Question 3

Which of the following changes have the potential to dramatically affect the potential difference across the plasma membrane?

Accepted Answer

A)  increased permeability of the membrane to sodium ions 
B)  increased intracellular concentration of potassium ions 
C)  any change in the rate at which the sodium-potassium pump works 
D)  increased permeability of the membrane to sodium ions and increased intracellular concentration of potassium ions 
E)  increased permeability of the membrane to sodium ions, increased intracellular concentration of potassium ions and any change in the rate at which the sodium-potassium pump works 
A)  increased permeability of the membrane to sodium ions 
B)  increased intracellular concentration of potassium ions 
C)  any change in the rate at which the sodium-potassium pump works 
D)  increased permeability of the membrane to sodium ions and increased intracellular concentration of potassium ions 
E)  increased permeability of the membrane to sodium ions, increased intracellular concentration of potassium ions and any change in the rate at which the sodium-potassium pump works

Question 4

What type of muscle tissue has neuromuscular junctions?

Accepted Answer

A)  skeletal muscle 
B)  smooth muscle 
C)  cardiac muscle 
A)  skeletal muscle 
B)  smooth muscle 
C)  cardiac muscle

Question 5

As muscle activity increases, the body temperature _____.

Accepted Answer

A)  decreases 
B)  increase 
A)  decreases 
B)  increase

Question 6

Which of the following occurs during recovery from oxygen deficit?

Accepted Answer

A)  an elevated level of anaerobic metabolism 
B)  depletion of reserves of creatine phosphate 
C)  conversion of excess lactic acid to glucose 
D)  glycogen degradation to provide creatine 
E)  depressed level of aerobic respiration 
A)  an elevated level of anaerobic metabolism 
B)  depletion of reserves of creatine phosphate 
C)  conversion of excess lactic acid to glucose 
D)  glycogen degradation to provide creatine 
E)  depressed level of aerobic respiration

Question 7

Which of the following is NOT a property of the myosin head?

Accepted Answer

A)  They form cross-bridges with the active sites of actin. 
B)  They have a hinge region to bend and straighten. 
C)  They bind to troponin. 
D)  They have ATPase activity. 
E)  They bind to ATP. 
A)  They form cross-bridges with the active sites of actin. 
B)  They have a hinge region to bend and straighten. 
C)  They bind to troponin. 
D)  They have ATPase activity. 
E)  They bind to ATP.

Question 8

The stretch of elastic components of a muscle adds to the increased tension during

Accepted Answer

A)  incomplete tetanus. 
B)  twitch. 
C)  multiple wave summation. 
D)  all or none response. 
E)  none of these. 
A)  incomplete tetanus. 
B)  twitch. 
C)  multiple wave summation. 
D)  all or none response. 
E)  none of these.

Question 9

Susan slipped on the ice and was unable to be fully mobile for several days. What disruption to homeostasis would you predict she experienced during her immobile period in terms of her muscular system?

Accepted Answer

A)  Susan's metabolic rate was raised and it initiated sweating. 
B)  Susan was more cold than usual because her inactivity prevented her muscles from helping to regulate her body temperature. 
C)  Susan's uninjured muscles overcompensate for the inactive ones by contracting spontaneously. 
A)  Susan's metabolic rate was raised and it initiated sweating. 
B)  Susan was more cold than usual because her inactivity prevented her muscles from helping to regulate her body temperature. 
C)  Susan's uninjured muscles overcompensate for the inactive ones by contracting spontaneously.

Question 10

The time between application of the stimulus to a motor neuron and the beginning of contraction is called the _____ phase.

Accepted Answer

A)  contraction 
B)  relaxation 
C)  latent or lag 
D)  refractory 
E)  threshold 
A)  contraction 
B)  relaxation 
C)  latent or lag 
D)  refractory 
E)  threshold

Question 11

Betsy took a fall, broke her arm, and when she took the cast off she was alarmed to see that her muscles

Accepted Answer

A)  looked the same as they did before the fall. 
B)  had undergone atrophy. 
C)  undergone hypertrophy. 
D)  seemed to have an increase in blood flow. 
A)  looked the same as they did before the fall. 
B)  had undergone atrophy. 
C)  undergone hypertrophy. 
D)  seemed to have an increase in blood flow.

Question 12

Aerobic respiration

Accepted Answer

A)  produces ATP molecules faster than anaerobic respiration. 
B)  yields as many as 36 ATP per glucose molecule metabolized. 
C)  occurs whether oxygen is present or not. 
D)  occurs entirely in the cytoplasm. 
E)  occurs in the ribosomes. 
A)  produces ATP molecules faster than anaerobic respiration. 
B)  yields as many as 36 ATP per glucose molecule metabolized. 
C)  occurs whether oxygen is present or not. 
D)  occurs entirely in the cytoplasm. 
E)  occurs in the ribosomes.

Question 13

ATPase is found in

Accepted Answer

A)  F-actin strands. 
B)  G-actin globular units. 
C)  myosin heads. 
D)  tropomyosin grooves. 
E)  troponin molecules. 
A)  F-actin strands. 
B)  G-actin globular units. 
C)  myosin heads. 
D)  tropomyosin grooves. 
E)  troponin molecules.

Question 14

Which of the following statements regarding the sliding filament model is false?

Accepted Answer

A)  Actin and myosin do not shorten during contraction. 
B)  Both actin and myosin myofilaments shorten during contraction. 
C)  The sarcomere shortens. 
D)  The I band and H zones become narrower during contraction. 
E)  The A band remains constant in length. 
A)  Actin and myosin do not shorten during contraction. 
B)  Both actin and myosin myofilaments shorten during contraction. 
C)  The sarcomere shortens. 
D)  The I band and H zones become narrower during contraction. 
E)  The A band remains constant in length.

Question 15

Intense exercise that results in a great deal of anaerobic activity

Accepted Answer

A)  converts some slow-twitch fibers into fast-twitch fibers. 
B)  increases muscular strength and mass. 
C)  enlarges slow-twitch fibers. 
D)  decreases the efficiency of fast-twitch fibers. 
E)  decreases muscle strength and mass. 
A)  converts some slow-twitch fibers into fast-twitch fibers. 
B)  increases muscular strength and mass. 
C)  enlarges slow-twitch fibers. 
D)  decreases the efficiency of fast-twitch fibers. 
E)  decreases muscle strength and mass.

Question 16

Describe the H zone of the sarcomere. The H zone:

Accepted Answer

A)  contains both myosin and actin myofilaments 
B)  contains only actin myofilaments 
C)  contains only myosin myofilaments 
A)  contains both myosin and actin myofilaments 
B)  contains only actin myofilaments 
C)  contains only myosin myofilaments

Question 17

During resting conditions, _________ is synthesized to store energy?

Accepted Answer

A)  calcium 
B)  creatine phosphate 
C)  creatine 
D)  lactic acid 
E)  pyruvic acid 
A)  calcium 
B)  creatine phosphate 
C)  creatine 
D)  lactic acid 
E)  pyruvic acid

Question 18

Curare blocks acetylcholine receptors at the motor end plate. This would result in

Accepted Answer

A)  increased stimulation of the muscle. 
B)  more acetylcholinesterase production. 
C)  lack of calcium uptake by the muscle fiber. 
D)  inability of the muscle fiber to respond to nervous stimulation. 
E)  sustained contraction of the muscle. 
A)  increased stimulation of the muscle. 
B)  more acetylcholinesterase production. 
C)  lack of calcium uptake by the muscle fiber. 
D)  inability of the muscle fiber to respond to nervous stimulation. 
E)  sustained contraction of the muscle.

Question 19

Which type of muscle tissue is multinucleated?

Accepted Answer

A)  skeletal muscle 
B)  smooth muscle 
C)  cardiac muscle 
D)  both skeletal and cardiac muscle 
E)  both cardiac and smooth muscle 
A)  skeletal muscle 
B)  smooth muscle 
C)  cardiac muscle 
D)  both skeletal and cardiac muscle 
E)  both cardiac and smooth muscle

Question 20

Which of the following structures contains the other four items listed?

Accepted Answer

A)  postsynaptic membrane 
B)  presynaptic terminal 
C)  synaptic cleft 
D)  neuromuscular junction 
E)  receptors on postsynaptic membrane 
A)  postsynaptic membrane 
B)  presynaptic terminal 
C)  synaptic cleft 
D)  neuromuscular junction 
E)  receptors on postsynaptic membrane

Exam 9: Muscular System: Histology and Physiology

The elevated oxygen consumption relative to activity level after exercise has ended is called

Which type of muscle tissue causes contraction of the heart?

Which of the following changes have the potential to dramatically affect the potential difference across the plasma membrane?

What type of muscle tissue has neuromuscular junctions?

As muscle activity increases, the body temperature _____.

Which of the following occurs during recovery from oxygen deficit?

Which of the following is NOT a property of the myosin head?

The stretch of elastic components of a muscle adds to the increased tension during

Susan slipped on the ice and was unable to be fully mobile for several days. What disruption to homeostasis would you predict she experienced during her immobile period in terms of her muscular system?

The time between application of the stimulus to a motor neuron and the beginning of contraction is called the _____ phase.

Betsy took a fall, broke her arm, and when she took the cast off she was alarmed to see that her muscles

Aerobic respiration

ATPase is found in

Which of the following statements regarding the sliding filament model is false?

Intense exercise that results in a great deal of anaerobic activity

Describe the H zone of the sarcomere. The H zone:

During resting conditions, _________ is synthesized to store energy?

Curare blocks acetylcholine receptors at the motor end plate. This would result in

Which type of muscle tissue is multinucleated?

Which of the following structures contains the other four items listed?

The Human Organism

The Chemical Basis of Life

Cell Biology

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: the Heart

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Temperature Regulation

Urinary System

Water, Electrolyte, and Acid-Based Balance

Reproductive System

Development, Growth, Aging, and Genetics

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