Question 1

What would most likely happen if there were a decrease in the number of acetylcholine receptors in an NMJ?

Accepted Answer

A)  decreased neurotransmitter release into the synaptic cleft 
B)  increased sodium ion influx at the motor endplate 
C)  decreased action potential generation at the motor endplate 
D)  increased action potential generation at the motor endplate 
A)  decreased neurotransmitter release into the synaptic cleft 
B)  increased sodium ion influx at the motor endplate 
C)  decreased action potential generation at the motor endplate 
D)  increased action potential generation at the motor endplate C

Question 2

What ion enters the muscle cell upon activation of the acetylcholine receptors?

Accepted Answer

A)  sodium 
B)  calcium 
C)  potassium 
D)  chloride 
A)  sodium 
B)  calcium 
C)  potassium 
D)  chloride A

Question 3

Which of the following proteins is the main component of thick filaments?

Accepted Answer

A)  myosin 
B)  sarcoplasm 
C)  actin 
D)  myofibril 
A)  myosin 
B)  sarcoplasm 
C)  actin 
D)  myofibril A

Question 4

What is the cell membrane of a muscle cell called?

Accepted Answer

A)  sarcolemma 
B)  sarcomere 
C)  sarcoplasmic reticulum 
D)  sarcoplasm 
A)  sarcolemma 
B)  sarcomere 
C)  sarcoplasmic reticulum 
D)  sarcoplasm

Question 5

What is the anatomical name for the tube-like structures that are open to the surface of the sarcolemma and form a portion of a triad?

Accepted Answer

A)  cisternae 
B)  myofibril 
C)  sarcoplasmic reticulum 
D)  T-tubules 
A)  cisternae 
B)  myofibril 
C)  sarcoplasmic reticulum 
D)  T-tubules

Question 6

What is the name of the area of the sarcolemma that is associated with the neuromuscular junction?

Accepted Answer

A)  junctional folds 
B)  synaptic terminal 
C)  synaptic cleft 
D)  motor end plate 
A)  junctional folds 
B)  synaptic terminal 
C)  synaptic cleft 
D)  motor end plate

Question 7

Which neurotransmitter is released at the neuromuscular junction?

Accepted Answer

A)  sodium 
B)  acetylcholine 
C)  glutamate 
D)  acetylcholinesterase 
A)  sodium 
B)  acetylcholine 
C)  glutamate 
D)  acetylcholinesterase

Question 8

What is the anatomical name for the combination of cisternae and a transverse tubule?

Accepted Answer

A)  sarcoplasmic reticulum 
B)  sarcolemma 
C)  triad 
D)  Z line 
A)  sarcoplasmic reticulum 
B)  sarcolemma 
C)  triad 
D)  Z line

Question 9

The release of calcium ions from the sarcoplasmic reticulum in response to an action potential is known as ________.

Accepted Answer

A)  power stroke 
B)  sliding filament theory 
C)  tropomyosin 
D)  excitation-contraction coupling 
A)  power stroke 
B)  sliding filament theory 
C)  tropomyosin 
D)  excitation-contraction coupling

Question 10

Which structure stores calcium ions for release in the muscle cell?

Accepted Answer

A)  sarcolemma 
B)  sarcomere 
C)  sarcoplasm 
D)  sarcoplasmic reticulum 
A)  sarcolemma 
B)  sarcomere 
C)  sarcoplasm 
D)  sarcoplasmic reticulum

Question 11

Which of the following is a globular protein that binds to calcium?

Accepted Answer

A)  tropomyosin 
B)  troponin 
C)  actin 
D)  myosin 
A)  tropomyosin 
B)  troponin 
C)  actin 
D)  myosin

Question 12

What is it called when the myosin heads pivot and pull on the actin filaments?

Accepted Answer

A)  power stroke 
B)  tropomyosin displacement 
C)  action potential 
D)  troponin 
A)  power stroke 
B)  tropomyosin displacement 
C)  action potential 
D)  troponin

Question 13

What is the name for embryonic muscle cells?

Accepted Answer

A)  myosins 
B)  myoblasts 
C)  myofibrils 
D)  myofilaments 
A)  myosins 
B)  myoblasts 
C)  myofibrils 
D)  myofilaments

Question 14

What happens when a patient is poisoned by botulism?

Accepted Answer

A)  increased respiratory rate 
B)  blurry, double vision 
C)  constricted pupils 
D)  increased acetylcholine release 
A)  increased respiratory rate 
B)  blurry, double vision 
C)  constricted pupils 
D)  increased acetylcholine release

Question 15

What structure contains proteins that stabilize the thin filaments?

Accepted Answer

A)  Z line 
B)  M line 
C)  A band 
D)  I band 
A)  Z line 
B)  M line 
C)  A band 
D)  I band

Question 16

What is the name for the region of the sarcomere that contains only thick filaments?

Accepted Answer

A)  Z line 
B)  A band 
C)  H band 
D)  I band 
A)  Z line 
B)  A band 
C)  H band 
D)  I band

Question 17

What structure of a sarcomere contains proteins that connect and stabilize thin filaments?

Accepted Answer

A)  Z line 
B)  H band 
C)  I band 
D)  A band 
A)  Z line 
B)  H band 
C)  I band 
D)  A band

Question 18

Which of the following is both a protein and a structural component of thin filaments?

Accepted Answer

A)  actin 
B)  myosin 
C)  myofibrils 
D)  T-tubules 
A)  actin 
B)  myosin 
C)  myofibrils 
D)  T-tubules

Question 19

What is the "group name" for a motor nerve fiber and all the muscle fibers it stimulates?

Accepted Answer

A)  motor end plate 
B)  myasthenia gravis 
C)  synaptic terminal 
D)  motor unit 
A)  motor end plate 
B)  myasthenia gravis 
C)  synaptic terminal 
D)  motor unit

Question 20

Which of the following is a double-stranded protein that blocks actin-binding sites?

Accepted Answer

A)  myosin 
B)  DNA 
C)  tropomyosin 
D)  troponin 
A)  myosin 
B)  DNA 
C)  tropomyosin 
D)  troponin

Exam 10: Introduction to Skeletal Muscle

What would most likely happen if there were a decrease in the number of acetylcholine receptors in an NMJ?

What ion enters the muscle cell upon activation of the acetylcholine receptors?

Which of the following proteins is the main component of thick filaments?

What is the cell membrane of a muscle cell called?

What is the anatomical name for the tube-like structures that are open to the surface of the sarcolemma and form a portion of a triad?

What is the name of the area of the sarcolemma that is associated with the neuromuscular junction?

Which neurotransmitter is released at the neuromuscular junction?

What is the anatomical name for the combination of cisternae and a transverse tubule?

The release of calcium ions from the sarcoplasmic reticulum in response to an action potential is known as ________.

Which structure stores calcium ions for release in the muscle cell?

Which of the following is a globular protein that binds to calcium?

What is it called when the myosin heads pivot and pull on the actin filaments?

What is the name for embryonic muscle cells?

What happens when a patient is poisoned by botulism?

What structure contains proteins that stabilize the thin filaments?

What is the name for the region of the sarcomere that contains only thick filaments?

What structure of a sarcomere contains proteins that connect and stabilize thin filaments?

Which of the following is both a protein and a structural component of thin filaments?

What is the "group name" for a motor nerve fiber and all the muscle fibers it stimulates?

Which of the following is a double-stranded protein that blocks actin-binding sites?

Body Organization and Terminology

Care and Use of the Compound Light Microscope

Cell Structure and Cell Division

Membrane Transport

Tissues

The Integumentary System

Introduction to the Skeletal System and the Axial Skeleton

The Appendicular Skeleton

Articulations

Muscles of the Head, Neck, and Trunk

Muscles of the Upper and Lower Limbs

Physiology of the Muscular System

Nervous Tissue

The Brain and Cranial Nerves

The Spinal Cord and Spinal Nerves

Human Reflex Physiology

Special Senses

The Endocrine System

Blood Cells

Gross Anatomy of the Heart

Anatomy of Blood Vessels

Cardiovascular Physiology

The Lymphatic System

Anatomy of the Respiratory System

Respiratory Physiology

Anatomy of the Digestive System

Actions of a Digestive Enzyme

Anatomy of the Urinary System

Urinary Physiology

The Male Reproductive System

The Female Reproductive System

Filters