Question 1

Identify the structure (clear area) at the tip of the arrow

Accepted Answer

A)  epineurium 
B)  perineurium 
C)  endomysium 
D)  perimysium 
E)  epimysium 
A)  epineurium 
B)  perineurium 
C)  endomysium 
D)  perimysium 
E)  epimysium D

Question 2

Motor innervation of skeletal muscle is via myelinated α motor neurons that arborize and form synapses with the muscle fiber. Acetylcholine is released from the neuron and binds to receptors located on the

Accepted Answer

A)  presynaptic membrane 
B)  motor end plate 
C)  external lamina 
D)  active site 
E)  quanta 
A)  presynaptic membrane 
B)  motor end plate 
C)  external lamina 
D)  active site 
E)  quanta B

Question 3

Identify the cell whose nucleus is at the tip of the arrow

Accepted Answer

A)  skeletal muscle cell 
B)  adipocyte 
C)  satellite cell 
D)  Schwann cell 
E)  endothelial cell 
A)  skeletal muscle cell 
B)  adipocyte 
C)  satellite cell 
D)  Schwann cell 
E)  endothelial cell C

Question 4

A patient has the autoimmune disease myasthenia gravis. This condition is due to patient's inability to

Accepted Answer

A)  release acetylcholine 
B)  release norepinephrine 
C)  make norepinephrine receptors 
D)  bind norepinephrine by norepinephrine receptors 
E)  bind acetylcholine by acetylcholine receptors 
A)  release acetylcholine 
B)  release norepinephrine 
C)  make norepinephrine receptors 
D)  bind norepinephrine by norepinephrine receptors 
E)  bind acetylcholine by acetylcholine receptors

Question 5

Thick filaments are held in register with one another by

Accepted Answer

A)  titin 
B)  nebulin 
C)  tropomyosin 
D)  troponin 
E)  tropomodulin 
A)  titin 
B)  nebulin 
C)  tropomyosin 
D)  troponin 
E)  tropomodulin

Question 6

A person's ability to touch her nose with her eyes closed is due to

Accepted Answer

A)  muscle spindles 
B)  two-cell reflex arc 
C)  three-cell reflex arc 
D)  sympathetic component of the autonomic nervous system 
E)  parasympathetic component of the autonomic nervous system 
A)  muscle spindles 
B)  two-cell reflex arc 
C)  three-cell reflex arc 
D)  sympathetic component of the autonomic nervous system 
E)  parasympathetic component of the autonomic nervous system

Question 7

Identify the tissue within the rectangle

Accepted Answer

A)  dense regular collagenous connective tissue 
B)  dense regular elastic connective tissue 
C)  skeletal muscle 
D)  cardiac muscle 
E)  smooth muscle 
A)  dense regular collagenous connective tissue 
B)  dense regular elastic connective tissue 
C)  skeletal muscle 
D)  cardiac muscle 
E)  smooth muscle

Question 8

Annually, more than two million people in the United States have elected to be injected with botulinum toxin A in order to diminish frown lines and make their facial skin appear smoother and younger looking. The toxin paralyzes the injected facial muscles because it

Accepted Answer

A)  inhibits acetylcholine binding 
B)  inhibits acetylcholine receptor formation 
C)  competes for the acetylcholine binding site 
D)  interferes with acetylcholine synthesis 
E)  interferes with the release of acetylcholine 
A)  inhibits acetylcholine binding 
B)  inhibits acetylcholine receptor formation 
C)  competes for the acetylcholine binding site 
D)  interferes with acetylcholine synthesis 
E)  interferes with the release of acetylcholine

Question 9

Cardiac muscle cells differ from skeletal muscle cells in that cardiac muscle cells

Accepted Answer

A)  possess narrower T tubules 
B)  are multinucleated, but their nuclei are not peripherally located 
C)  are the same length as the ventricles of the heart 
D)  require calcium in the extracellular compartment, or they cannot contract 
E)  can sustain contraction even during complete hypoxic conditions 
A)  possess narrower T tubules 
B)  are multinucleated, but their nuclei are not peripherally located 
C)  are the same length as the ventricles of the heart 
D)  require calcium in the extracellular compartment, or they cannot contract 
E)  can sustain contraction even during complete hypoxic conditions

Question 10

In early May a pathologist is called to the crime scene in Baltimore, Maryland, to examine a cadaver. She notes that the body is in maximal rigor mortis and determines that the person has been dead for

Accepted Answer

A)  2 hours 
B)  6 hours 
C)  18 hours 
D)  2 days 
E)  1 week 
A)  2 hours 
B)  6 hours 
C)  18 hours 
D)  2 days 
E)  1 week

Question 11

The extrafusal fibers of a muscle spindle receive their nerve supply from which of the following?

Accepted Answer

A)  primary sensory endings 
B)  secondary sensory endings 
C)  dynamic $\gamma$ motor neuron 
D)  static $\gamma$ motor neuron 
E) $\alpha$ motor neuron 
A)  primary sensory endings 
B)  secondary sensory endings 
C)  dynamic $\gamma$ motor neuron 
D)  static $\gamma$ motor neuron 
E) $\alpha$ motor neuron

Question 12

Smooth muscle cells lack

Accepted Answer

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

Question 13

Myofibrils are held in register with each other by structures known as

Accepted Answer

A)  desmin 
B)  dystrophin 
C)  keratin 
D)  lamins 
E)  neurofilaments 
A)  desmin 
B)  dystrophin 
C)  keratin 
D)  lamins 
E)  neurofilaments

Question 14

Which of the following is true concerning human skeletal muscle? It has

Accepted Answer

A)  dyads 
B)  triads 
C)  caveolae 
D)  a centrally positioned nucleus 
E)  intercalated disks 
A)  dyads 
B)  triads 
C)  caveolae 
D)  a centrally positioned nucleus 
E)  intercalated disks

Question 15

The cells located within the rectangle

Accepted Answer

A)  are modified smooth muscle cells 
B)  are modified skeletal muscle cells 
C)  function in contraction 
D)  function in impulse transmission 
E)  function in glucose transport 
A)  are modified smooth muscle cells 
B)  are modified skeletal muscle cells 
C)  function in contraction 
D)  function in impulse transmission 
E)  function in glucose transport

Question 16

An entire skeletal muscle is invested by a connective tissue element known as

Accepted Answer

A)  endomysium 
B)  basement membrane 
C)  external lamina 
D)  epimysium 
E)  perimysium 
A)  endomysium 
B)  basement membrane 
C)  external lamina 
D)  epimysium 
E)  perimysium

Question 17

A 49-year-old man presents to the emergency department with chest pain. The examining physician knows that conditions such as a fractured rib, pneumonia, and pericarditis can cause similar symptoms. What is the best initial diagnostic test that the doctor can perform to determine very rapidly whether or not the patient is experiencing a myocardial infarction?

Accepted Answer

A)  ECG 
B)  EEG 
C)  listening to the heart with a stethoscope 
D)  blood test for the enzyme CK-MB 
E)  electron myography 
A)  ECG 
B)  EEG 
C)  listening to the heart with a stethoscope 
D)  blood test for the enzyme CK-MB 
E)  electron myography

Question 18

The sarcoplasmic reticulum of skeletal muscle

Accepted Answer

A)  sequesters Na+ ions 
B)  possesses voltage-gated K+ channels 
C)  is depolarized by T tubules 
D)  is responsible for acetylcholine synthesis 
E)  is responsible for synthesis of actin and myosin 
A)  sequesters Na+ ions 
B)  possesses voltage-gated K+ channels 
C)  is depolarized by T tubules 
D)  is responsible for acetylcholine synthesis 
E)  is responsible for synthesis of actin and myosin

Question 19

A medical student and her nurse boyfriend present in the emergency room of a hospital complaining about nausea, vomiting, diarrhea, stomach cramps, double vision, and drooping eyelids. Their symptoms began less than 24 hours after dinner at home and they both remembered that the can of corn that they consumed with dinner was damaged. The doctor should suspect

Accepted Answer

A)  acid reflux 
B)  myocardial infarct 
C)  stroke 
D)  botulism 
E)  duodenal ulcer 
A)  acid reflux 
B)  myocardial infarct 
C)  stroke 
D)  botulism 
E)  duodenal ulcer

Question 20

Cardiac muscle cells house granules that

Accepted Answer

A)  contain renin 
B)  contain angiotensinogen 
C)  lower blood pressure 
D)  increase the ability of renal tubules to resorb sodium 
E)  increase the ability of renal tubules to resorb water 
A)  contain renin 
B)  contain angiotensinogen 
C)  lower blood pressure 
D)  increase the ability of renal tubules to resorb sodium 
E)  increase the ability of renal tubules to resorb water

Identify the structure (clear area) at the tip of the arrow

Motor innervation of skeletal muscle is via myelinated α motor neurons that arborize and form synapses with the muscle fiber. Acetylcholine is released from the neuron and binds to receptors located on the

Identify the cell whose nucleus is at the tip of the arrow

A patient has the autoimmune disease myasthenia gravis. This condition is due to patient's inability to

Thick filaments are held in register with one another by

A person's ability to touch her nose with her eyes closed is due to

Identify the tissue within the rectangle

Annually, more than two million people in the United States have elected to be injected with botulinum toxin A in order to diminish frown lines and make their facial skin appear smoother and younger looking. The toxin paralyzes the injected facial muscles because it

Cardiac muscle cells differ from skeletal muscle cells in that cardiac muscle cells

In early May a pathologist is called to the crime scene in Baltimore, Maryland, to examine a cadaver. She notes that the body is in maximal rigor mortis and determines that the person has been dead for

The extrafusal fibers of a muscle spindle receive their nerve supply from which of the following?

Smooth muscle cells lack

Myofibrils are held in register with each other by structures known as

Which of the following is true concerning human skeletal muscle? It has

The cells located within the rectangle

An entire skeletal muscle is invested by a connective tissue element known as

The sarcoplasmic reticulum of skeletal muscle

Cardiac muscle cells house granules that

Cytoplasm

Nucleus

Extracellular Matrix

Epithelium and Glands

Connective Tissue

Cartilage and Bone

Nervous Tissue

Blood and Hemopoiesis

Circulatory System

Lymphoid Immune System

Endocrine System

Integument

Respiratory System

Digestive System: Oral Cavity

Digestive System: Alimentary Canal

Digestive System: Glands

Urinary System

Female Reproductive System

Male Reproductive System

Special Senses

Filters

Exam 7: Muscle

Identify the structure (clear area) at the tip of the arrow

Motor innervation of skeletal muscle is via myelinated α motor neurons that arborize and form synapses with the muscle fiber. Acetylcholine is released from the neuron and binds to receptors located on the

Identify the cell whose nucleus is at the tip of the arrow

A patient has the autoimmune disease myasthenia gravis. This condition is due to patient's inability to

Thick filaments are held in register with one another by

A person's ability to touch her nose with her eyes closed is due to

Identify the tissue within the rectangle

Annually, more than two million people in the United States have elected to be injected with botulinum toxin A in order to diminish frown lines and make their facial skin appear smoother and younger looking. The toxin paralyzes the injected facial muscles because it

Cardiac muscle cells differ from skeletal muscle cells in that cardiac muscle cells

In early May a pathologist is called to the crime scene in Baltimore, Maryland, to examine a cadaver. She notes that the body is in maximal rigor mortis and determines that the person has been dead for

The extrafusal fibers of a muscle spindle receive their nerve supply from which of the following?

Smooth muscle cells lack

Myofibrils are held in register with each other by structures known as

Which of the following is true concerning human skeletal muscle? It has

The cells located within the rectangle

An entire skeletal muscle is invested by a connective tissue element known as

The sarcoplasmic reticulum of skeletal muscle

Cardiac muscle cells house granules that

Cytoplasm

Nucleus

Extracellular Matrix

Epithelium and Glands

Connective Tissue

Cartilage and Bone

Nervous Tissue

Blood and Hemopoiesis

Circulatory System

Lymphoid Immune System

Endocrine System

Integument

Respiratory System

Digestive System: Oral Cavity

Digestive System: Alimentary Canal

Digestive System: Glands

Urinary System

Female Reproductive System

Male Reproductive System

Special Senses

Filters