Question 1

Which of the following is the smallest unit in terms of size?

Accepted Answer

A)  quadriceps
B)  myofibril
C)  muscle fiber
D)  sarcomere
E)  myofilamentsF) A) and B)
G) None of the above

Question 2

The structure enabling depolarization to travel deep into the muscle fiber is the ________.

Accepted Answer

A)  T tubule
B)  sarcoplasmic reticulum
C)  motor unit
D)  sarcomereE) B) and C)
F) A) and C)

Question 3

Which of the following is required to detach myosin from actin?

Accepted Answer

A)  calcium
B)  ATP
C)  phosphate
D)  troponin
E)  ADPF) A) and B)
G) C) and D)

Question 4

Which of the bone development lineages is incorrect?

Accepted Answer

A)  undifferentiated mesenchymal cells → osteocyte → osteoblast
B)  undifferentiated mesenchymal cells → fibroblast → collagen
C)  undifferentiated mesenchymal cells → chondroblast → chondrocyte
D)  white blood cell progenitors → monocytes → osteoclast
E)  undifferentiated mesenchymal cells → osteoblast → osteocyteF) B) and E)
G) D) and E)

Question 5

What molecule contributes to the red color of slow-twitch muscle fibers?

Accepted Answer

A)  glycogen
B)  lactic acid
C)  ATP
D)  myoglobin
E)  fatty acidsF) A) and D)
G) A) and C)

Question 6

In arthropods,locomotion is accomplished by muscles that work against

Accepted Answer

A)  each other.
B)  the exoskeleton.
C)  a hydrostatic skeleton.
D)  mineralized bones.
E)  the pseudocoel.F) A) and B)
G) D) and E)

Question 7

The masseter muscles originate on your cheekbones and insert into the posterior corners of the mandible (the lower jaw bone) underneath your ears.Will contraction of the masseter muscles open or close your jaw?

Accepted Answer

A)  close
B)  openC) A) and B)
D) undefined

Question 8

You are investigating the scene of a hit and run where somebody's pet dog was killed.It is a very hot day so the dog's body temperature is unlikely to yield any important information regarding the time of death.The dog's limbs are movable and there is no significant smell of rotting flesh.What is the best guess of the time of death?

Accepted Answer

A)  within the last 10 minutes
B)  within the last 2 hours
C)  3-4 hours ago
D)  24 hours agoE) A) and B)
F) B) and C)

Question 9

The neurotransmitter released from the nerve terminus at the neuromuscular junction is ________.

Accepted Answer

A)  troponin
B)  Ca2+
C)  tropomyosin
D)  acetylcholineE) A) and B)
F) A) and C)

Question 10

Imagine an earthworm that has no chaetae.How would the lack of chaetae affect movement of the earthworm?

Accepted Answer

A)  The earthworm would not be able to move at all.
B)  The earthworm would only be able to extend its body segments.
C)  The earthworm would only be able to shorten its body segments.
D)  The earthworm would have difficulty changing locations,since it cannot anchor itself in the soil.
E)  The earthworm would be much flatter than normal since it has no hydrostatic skeleton.F) C) and D)
G) A) and B)

Question 11

Myofibril contractile subunits,the sarcomeres,are bounded on each end by a disc of protein called the

Accepted Answer

A)  H band.
B)  I band.
C)  A band.
D)  Z line.
E)  M line.F) A) and B)
G) B) and E)

Question 12

A cross bridge is the binding of which two proteins?

Accepted Answer

A)  actin and myosin
B)  actin and troponin
C)  myosin and troponin
D)  collagen and troponin
E)  myosin and collagenF) A) and B)
G) All of the above

Question 13

Sarin gas is an inhibitor of an enzyme that functions in the neuromuscular junction to break down acetylcholine.What is the most likely description of how a person would die after inhaling this poisonous gas?

Accepted Answer

A)  by a heart attack
B)  paralysis of skeletal muscles
C)  suffocation via tetanus,or constant stimulation,of the respiratory muscles
D)  suffocation via paralysis,or a block in stimulation,of the respiratory muscles
E)  epileptic convulsions caused by disorganized electrical activity in the brainF) C) and E)
G) C) and D)

Question 14

In a stimulated muscle fiber,the calcium ions released by the sarcoplasmic reticulum bind to the protein ________.

Accepted Answer

A)  troponin
B)  tropomyosin
C)  actin
D)  myosinE) B) and D)
F) A) and B)

Question 15

Which animal does a dolphin or whale most resemble as it swims through water?

Accepted Answer

A)  A running lizard
B)  A running dog
C)  A swimming shark
D)  A swimming alligator
E)  A swimming penguinF) A) and C)
G) B) and D)

Question 16

Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm

Accepted Answer

A)  from the sarcoplasmic reticulum.
B)  from the actin and myosin subunits.
C)  from the Z line.
D)  from the extracellular fluid in the neuromuscular junction.
E)  from the troponin.F) None of the above
G) D) and E)

Question 17

A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor.Which of the following is the correct sequence? I-The calcium-troponin complex pulls tropomyosin away from the myosin binding sites of actin.
II-The freed-sites of actin bind to myosin to form cross bridges.
III-Calcium ion binds to the troponin.

Accepted Answer

A)  I,III,and II
B)  III,II,and I
C)  II,III,and I
D)  I,II,and III
E)  III,I,and IIF) C) and D)
G) A) and B)

Exam 45: The Musculoskeletal System

Correct Answer
verified

What molecule contributes to the red color of slow-twitch muscle fibers?

Correct Answer
verified

In a stimulated muscle fiber,the calcium ions released by the sarcoplasmic reticulum bind to the protein ________.

Correct Answer
verified

The structure enabling depolarization to travel deep into the muscle fiber is the ________.

Correct Answer
verified

The neurotransmitter released from the nerve terminus at the neuromuscular junction is ________.

Correct Answer
verified

Sarin gas is an inhibitor of an enzyme that functions in the neuromuscular junction to break down acetylcholine.What is the most likely description of how a person would die after inhaling this poisonous gas?

Correct Answer
verified

Imagine an earthworm that has no chaetae.How would the lack of chaetae affect movement of the earthworm?

Correct Answer
verified

A cross bridge is the binding of which two proteins?

Correct Answer
verified

The masseter muscles originate on your cheekbones and insert into the posterior corners of the mandible (the lower jaw bone) underneath your ears.Will contraction of the masseter muscles open or close your jaw?

Correct Answer
verified

Which of the bone development lineages is incorrect?

Correct Answer
verified

Which of the following is the smallest unit in terms of size?

Correct Answer
verified

Correct Answer
verified

Myofibril contractile subunits,the sarcomeres,are bounded on each end by a disc of protein called the

Correct Answer
verified

Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm

Correct Answer
verified

Which of the following is required to detach myosin from actin?

Correct Answer
verified

Which animal does a dolphin or whale most resemble as it swims through water?

Correct Answer
verified

In arthropods,locomotion is accomplished by muscles that work against

Correct Answer
verified

Exam 45: The Musculoskeletal System

Correct AnswerverifiedShow Answer

What molecule contributes to the red color of slow-twitch muscle fibers?

Correct AnswerverifiedShow Answer

In a stimulated muscle fiber,the calcium ions released by the sarcoplasmic reticulum bind to the protein ________.

Correct AnswerverifiedShow Answer

The structure enabling depolarization to travel deep into the muscle fiber is the ________.

Correct AnswerverifiedShow Answer

The neurotransmitter released from the nerve terminus at the neuromuscular junction is ________.

Correct AnswerverifiedShow Answer

Sarin gas is an inhibitor of an enzyme that functions in the neuromuscular junction to break down acetylcholine.What is the most likely description of how a person would die after inhaling this poisonous gas?

Correct AnswerverifiedShow Answer

Imagine an earthworm that has no chaetae.How would the lack of chaetae affect movement of the earthworm?

Correct AnswerverifiedShow Answer

A cross bridge is the binding of which two proteins?

Correct AnswerverifiedShow Answer

The masseter muscles originate on your cheekbones and insert into the posterior corners of the mandible (the lower jaw bone) underneath your ears.Will contraction of the masseter muscles open or close your jaw?

Correct AnswerverifiedShow Answer

Which of the bone development lineages is incorrect?

Correct AnswerverifiedShow Answer

Which of the following is the smallest unit in terms of size?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Myofibril contractile subunits,the sarcomeres,are bounded on each end by a disc of protein called the

Correct AnswerverifiedShow Answer

Impulses conducted along the muscle fiber's transverse tubules stimulate the release of calcium ions into the cytoplasm

Correct AnswerverifiedShow Answer

Which of the following is required to detach myosin from actin?

Correct AnswerverifiedShow Answer

Which animal does a dolphin or whale most resemble as it swims through water?

Correct AnswerverifiedShow Answer

In arthropods,locomotion is accomplished by muscles that work against

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified