Question 1

Alex is participating in a 50 meter dash.Predict the most important chemical process his muscles will rely on during this race.

Accepted Answer

A) aerobic respiration. 
B) anaerobic respiration. 
C) creatine phosphate breakdown. 
D) nuclear reactions. 
E) both anaerobic respiration and creatine phosphate breakdown. 
A) aerobic respiration. 
B) anaerobic respiration. 
C) creatine phosphate breakdown. 
D) nuclear reactions. 
E) both anaerobic respiration and creatine phosphate breakdown. E

Question 2

When comparing smooth and skeletal muscle cells,which of the following statements is true?

Accepted Answer

A) Smooth muscle cells have striations. 
B) The myofilaments in smooth muscle do not form sarcomeres. 
C) Smooth muscle cells are larger than skeletal muscle cells. 
D) Smooth muscle has a lot of actin and myosin. 
E) Smooth muscle cells are multinucleated. 
A) Smooth muscle cells have striations. 
B) The myofilaments in smooth muscle do not form sarcomeres. 
C) Smooth muscle cells are larger than skeletal muscle cells. 
D) Smooth muscle has a lot of actin and myosin. 
E) Smooth muscle cells are multinucleated. B

Question 3

Which type of muscle tissue possesses striations?

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 D

Question 4

-What does "D" represent on the diagram?

Accepted Answer

A) myosin myofilament 
B) actin myofilament 
C) sarcomere 
D) Z disk 
E) cross-bridge 
A) myosin myofilament 
B) actin myofilament 
C) sarcomere 
D) Z disk 
E) cross-bridge

Question 5

Sarcoplasm is the

Accepted Answer

A) cell membrane of a muscle fiber. 
B) cytoplasm of muscle cells. 
C) structural and functional unit of the skeletal muscle cell. 
D) contractile thread that extends the length of the muscle fiber. 
E) protein strand composed of actin or myosin. 
A) cell membrane of a muscle fiber. 
B) cytoplasm of muscle cells. 
C) structural and functional unit of the skeletal muscle cell. 
D) contractile thread that extends the length of the muscle fiber. 
E) protein strand composed of actin or myosin.

Question 6

Physiological contracture

Accepted Answer

A) occurs when muscles are resting. 
B) is a condition in which cross-bridges cannot release. 
C) is caused by an abundance of ATP in muscle fibers. 
D) results when muscles are well exercised. 
E) results when the neurotransmitter remains in the receptor. 
A) occurs when muscles are resting. 
B) is a condition in which cross-bridges cannot release. 
C) is caused by an abundance of ATP in muscle fibers. 
D) results when muscles are well exercised. 
E) results when the neurotransmitter remains in the receptor.

Question 7

Troponin

Accepted Answer

A) has two subunits. 
B) is part of the myosin myofilament. 
C) is a long,flexible protein. 
D) has a calcium-binding site. 
E) binds to ATP. 
A) has two subunits. 
B) is part of the myosin myofilament. 
C) is a long,flexible protein. 
D) has a calcium-binding site. 
E) binds to ATP.

Question 8

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 9

Synaptic vesicles in the neuromuscular junction contain

Accepted Answer

A) calcium. 
B) ATP. 
C) acetylcholine. 
D) acetylcholinesterase. 
E) sodium. 
A) calcium. 
B) ATP. 
C) acetylcholine. 
D) acetylcholinesterase. 
E) sodium.

Question 10

Which of the following is true?

Accepted Answer

A) Muscle fatigue has no influence on the force of contractions. 
B) A threshold stimulus will cause contraction of a muscle fiber. 
C) A subthreshold stimulus causes a muscle contraction. 
D) Motor units do not obey the "all or none" law. 
E) A threshold stimulus will not affect motor units. 
A) Muscle fatigue has no influence on the force of contractions. 
B) A threshold stimulus will cause contraction of a muscle fiber. 
C) A subthreshold stimulus causes a muscle contraction. 
D) Motor units do not obey the "all or none" law. 
E) A threshold stimulus will not affect motor units.

Question 11

Muscular dystrophy is characterized by

Accepted Answer

A) chronic muscle pain. 
B) decreased size of muscle fibers. 
C) spastic contractions of muscles. 
D) replacement of muscle cells by connective tissue. 
E) hypertrophy of muscle tissue. 
A) chronic muscle pain. 
B) decreased size of muscle fibers. 
C) spastic contractions of muscles. 
D) replacement of muscle cells by connective tissue. 
E) hypertrophy of muscle tissue.

Question 12

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 13

Skeletal muscle fibers

Accepted Answer

A) possess striations. 
B) can contract but are not extensible or excitable. 
C) do not require nerve innervation to contract. 
D) increase dramatically in number after birth. 
E) are found in the walls of the stomach. 
A) possess striations. 
B) can contract but are not extensible or excitable. 
C) do not require nerve innervation to contract. 
D) increase dramatically in number after birth. 
E) are found in the walls of the stomach.

Question 14

Treppe

Accepted Answer

A) can contribute to improved muscle efficiency. 
B) may be due to an increase in the level of calcium ions around the myofibril. 
C) is an example of a graded response. 
D) is achieved during warm-up exercises. 
E) All of these choices are correct. 
A) can contribute to improved muscle efficiency. 
B) may be due to an increase in the level of calcium ions around the myofibril. 
C) is an example of a graded response. 
D) is achieved during warm-up exercises. 
E) All of these choices are correct.

Question 15

Which of the following statements concerning fast-twitch muscle fibers is true?

Accepted Answer

A) They split ATP rapidly. 
B) They have large deposits of myoglobin. 
C) They are well adapted to aerobic metabolism. 
D) They have a well-developed blood supply. 
E) They have many mitochondria. 
A) They split ATP rapidly. 
B) They have large deposits of myoglobin. 
C) They are well adapted to aerobic metabolism. 
D) They have a well-developed blood supply. 
E) They have many mitochondria.

Question 16

The type of muscle fatigue known as "psychological fatigue" is the result of

Accepted Answer

A) depleted ATP reserves. 
B) increased calcium ion concentration in the sarcoplasm. 
C) decreased levels of acetylcholine. 
D) the emotional state of an individual. 
E) None of these choices is correct. 
A) depleted ATP reserves. 
B) increased calcium ion concentration in the sarcoplasm. 
C) decreased levels of acetylcholine. 
D) the emotional state of an individual. 
E) None of these choices is correct.

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

-What does "B" represent on the diagram?

Accepted Answer

A) myosin myofilament 
B) actin myofilament 
C) sarcomere 
D) Z disk 
E) cross-bridge 
A) myosin myofilament 
B) actin myofilament 
C) sarcomere 
D) Z disk 
E) cross-bridge

Question 19

What is the role of myosin phosphatase?

Accepted Answer

A) can rapidly develop action potentials 
B) shallow invaginations of cell membrane 
C) relatively constant tension maintained for a period of time 
D) intracellular cytoskeleton 
E) enzyme that removes phosphate from myosin 
A) can rapidly develop action potentials 
B) shallow invaginations of cell membrane 
C) relatively constant tension maintained for a period of time 
D) intracellular cytoskeleton 
E) enzyme that removes phosphate from myosin

Question 20

-What does "C" represent on the diagram?

Accepted Answer

A) myosin myofilament 
B) actin myofilament 
C) sarcomere 
D) Z disk 
E) cross-bridge 
A) myosin myofilament 
B) actin myofilament 
C) sarcomere 
D) Z disk 
E) cross-bridge

Exam 9: Muscular System: Histology and Physiology

Alex is participating in a 50 meter dash.Predict the most important chemical process his muscles will rely on during this race.

When comparing smooth and skeletal muscle cells,which of the following statements is true?

Which type of muscle tissue possesses striations?

-What does "D" represent on the diagram?

Sarcoplasm is the

Physiological contracture

Troponin

Which type of muscle tissue causes contraction of the heart?

Synaptic vesicles in the neuromuscular junction contain

Which of the following is true?

Muscular dystrophy is characterized by

ATPase is found in

Skeletal muscle fibers

Treppe

Which of the following statements concerning fast-twitch muscle fibers is true?

The type of muscle fatigue known as "psychological fatigue" is the result of

During resting conditions,_________ is synthesized to store energy?

-What does "B" represent on the diagram?

What is the role of myosin phosphatase?

-What does "C" represent on the diagram?

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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