Question 1

Which of the following best describes the term sarcoplasmic reticulum?

Accepted Answer

A)  protein that accounts for elasticity of resting muscle 
B)  repeating unit of striated myofibrils 
C)  storage and release site for calcium ions 
D)  thin filaments are anchored here 
E)  largely made of myosin molecules 
A)  protein that accounts for elasticity of resting muscle 
B)  repeating unit of striated myofibrils 
C)  storage and release site for calcium ions 
D)  thin filaments are anchored here 
E)  largely made of myosin molecules

Question 2

Aerobic metabolism normally provides ________ percent of the ATP demands of a resting muscle cell.

Accepted Answer

A)  25 
B)  50 
C)  70 
D)  95 
E)  100 
A)  25 
B)  50 
C)  70 
D)  95 
E)  100

Question 3

The type of contraction where the tension exceeds the load is called

Accepted Answer

A)  isometric contraction. 
B)  isotonic eccentric contraction. 
C)  isotonic concentric contraction. 
D)  isometric concentric contraction. 
E)  isometric eccentric contraction. 
A)  isometric contraction. 
B)  isotonic eccentric contraction. 
C)  isotonic concentric contraction. 
D)  isometric concentric contraction. 
E)  isometric eccentric contraction.

Question 4

Which of the following best describes the term sarcomere?

Accepted Answer

A)  protein that accounts for elasticity of resting muscle 
B)  repeating unit of striated myofibrils 
C)  storage site for calcium ions 
D)  thin filaments are anchored here 
E)  largely made of myosin molecules 
A)  protein that accounts for elasticity of resting muscle 
B)  repeating unit of striated myofibrils 
C)  storage site for calcium ions 
D)  thin filaments are anchored here 
E)  largely made of myosin molecules

Question 5

A weight-lifter strains to lift a heavy weight and there is no movement of the person's arms holding ontothe weight. This type of contraction is called a(n) ________ contraction.

Accepted Answer

A)  isometric 
B)  tetanus 
C)  isotonic 
D)  treppe 
E)  concentric 
A)  isometric 
B)  tetanus 
C)  isotonic 
D)  treppe 
E)  concentric

Question 6

When a skeletal muscle fiber contracts, the

Accepted Answer

A)  H bands and I bands get larger. 
B)  zones of overlap get larger. 
C)  Z lines move further apart. 
D)  width of the A band increases. 
E)  All of the answers are correct. 
A)  H bands and I bands get larger. 
B)  zones of overlap get larger. 
C)  Z lines move further apart. 
D)  width of the A band increases. 
E)  All of the answers are correct.

Question 7

The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fiberstogether is the

Accepted Answer

A)  endomysium. 
B)  perimysium. 
C)  epimysium. 
D)  superficial fascia. 
E)  periosteum. 
A)  endomysium. 
B)  perimysium. 
C)  epimysium. 
D)  superficial fascia. 
E)  periosteum.

Question 8

Detachment of myosin cross-bridges occurs during the

Accepted Answer

A)  contraction phase. 
B)  relaxation phase. 
C)  stimulus phase. 
D)  latent period. 
E)  isotonic period. 
A)  contraction phase. 
B)  relaxation phase. 
C)  stimulus phase. 
D)  latent period. 
E)  isotonic period.

Question 9

The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is calleda(n)

Accepted Answer

A)  fascicle. 
B)  tendon. 
C)  ligament. 
D)  epimysium. 
E)  myofibril. 
A)  fascicle. 
B)  tendon. 
C)  ligament. 
D)  epimysium. 
E)  myofibril.

Question 10

Which of the following types of muscle fibers are best adapted for prolonged contraction such as standingall day?

Accepted Answer

A)  uninucleated fibers 
B)  striated fibers 
C)  fast fibers 
D)  slow fibers 
E)  intermediate fibers 
A)  uninucleated fibers 
B)  striated fibers 
C)  fast fibers 
D)  slow fibers 
E)  intermediate fibers

Question 11

Put the following events of the contraction cycle in the order in which they occur.
1) Cross-bridge detachment
2) Cross-bridge formation
3) Active site exposure
4) Myosin reactivation
5) Calcium ions bind troponin
6) Myosin head pivoting

Accepted Answer

A)  5,3,6,2,1,4 
B)  5,3,2,6,4,1 
C)  5,3,2,6,1,4 
D)  5,3,6,2,4,1 
E)  3,5,2,6,1,4 
A)  5,3,6,2,1,4 
B)  5,3,2,6,4,1 
C)  5,3,2,6,1,4 
D)  5,3,6,2,4,1 
E)  3,5,2,6,1,4

Question 12

At what point during excitation contraction coupling does exocytosis play a role?

Accepted Answer

A)  during calcium ion reuptake into the sarcoplasmic reticulum 
B)  when sodium channels open up on the motor end plate 
C)  during acetylcholine release from the synaptic terminal 
D)  when the action potential surges through the T-tubules 
E)  when ATP splits into ADP and P on the free myosin head 
A)  during calcium ion reuptake into the sarcoplasmic reticulum 
B)  when sodium channels open up on the motor end plate 
C)  during acetylcholine release from the synaptic terminal 
D)  when the action potential surges through the T-tubules 
E)  when ATP splits into ADP and P on the free myosin head

Question 13

During the time when the action potential moves through the sarcolemma a muscle twitch is in

Accepted Answer

A)  contraction phase. 
B)  relaxation phase. 
C)  stimulus phase. 
D)  latent period. 
E)  isotonic period. 
A)  contraction phase. 
B)  relaxation phase. 
C)  stimulus phase. 
D)  latent period. 
E)  isotonic period.

Question 14

The type of muscle fiber that is most resistant to fatigue is the ________ fiber.

Accepted Answer

A)  fast 
B)  slow 
C)  intermediate 
D)  anaerobic 
E)  high-density 
A)  fast 
B)  slow 
C)  intermediate 
D)  anaerobic 
E)  high-density

Question 15

In an isotonic contraction,

Accepted Answer

A)  muscle tension exceeds the load and the muscle lifts the load. 
B)  tension rises and falls but the muscle length is constant. 
C)  the peak tension is less than the load. 
D)  many twitches always fuse into one. 
E)  postural muscles stabilize the vertebrae. 
A)  muscle tension exceeds the load and the muscle lifts the load. 
B)  tension rises and falls but the muscle length is constant. 
C)  the peak tension is less than the load. 
D)  many twitches always fuse into one. 
E)  postural muscles stabilize the vertebrae.

Question 16

Muscle fibers differ from "typical cells" in that muscle fibers

Accepted Answer

A)  lack a plasma membrane. 
B)  have many nuclei. 
C)  are very small. 
D)  lack mitochondria. 
E)  have large gaps in the cell membrane. 
A)  lack a plasma membrane. 
B)  have many nuclei. 
C)  are very small. 
D)  lack mitochondria. 
E)  have large gaps in the cell membrane.

Question 17

Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs to develop and how she should go about it. What would you suggest to her?

Accepted Answer

Weight lifting requires anaerobic endura

Exam 10: Muscle Tissue

Which of the following best describes the term sarcoplasmic reticulum?

Aerobic metabolism normally provides ________ percent of the ATP demands of a resting muscle cell.

The type of contraction where the tension exceeds the load is called

Which of the following best describes the term sarcomere?

A weight-lifter strains to lift a heavy weight and there is no movement of the person's arms holding ontothe weight. This type of contraction is called a(n) ________ contraction.

When a skeletal muscle fiber contracts, the

The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fiberstogether is the

Detachment of myosin cross-bridges occurs during the

The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is calleda(n)

Which of the following types of muscle fibers are best adapted for prolonged contraction such as standingall day?

Put the following events of the contraction cycle in the order in which they occur. 1) Cross-bridge detachment 2) Cross-bridge formation 3) Active site exposure 4) Myosin reactivation 5) Calcium ions bind troponin 6) Myosin head pivoting

At what point during excitation contraction coupling does exocytosis play a role?

During the time when the action potential moves through the sarcolemma a muscle twitch is in

The type of muscle fiber that is most resistant to fatigue is the ________ fiber.

In an isotonic contraction,

Muscle fibers differ from "typical cells" in that muscle fibers

Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs to develop and how she should go about it. What would you suggest to her?

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System

Bones and Bone Structure

The Axial Skeleton

The Appendicular Skeleton

Joints

The Muscular System

Nervous Tissue

The Spinal Cord, Spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

Sensory Pathways and the Somatic Nervous System

The Autonomic Nervous System and Higher-Order Functions

The Special Senses

The Endocrine System

Blood

The Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism, Nutrition, and Energetics

The Urinary System

Fluid, Electrolyte, and Acid-Base Balance

The Reproductive System

Development and Inheritance

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