BIO 168 Exam Study Guide Questions and Answers With Verified Solutions 2025
How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?
A. It would cause spastic paralysis (muscles are contracted and unable to relax).
B. It would produce muscle weakness.
C. It would make the muscles less excitable.
D. It would have little effect on skeletal muscles.
E. It would cause flaccid paralysis (muscles are relaxed and unable to contract). - ✔✔A. It would cause
spastic paralysis (muscles are contracted and unable to relax).
Damage to which of the following muscles would interfere most with the ability to breathe?
A. intercostals
B. platysma
C. rectus abdominis
D. digastric
E. pterygoid - ✔✔A. intercostals
Muscles visible at the body surface are often called
A. intrinsic.
B. profundus.
C. rectus.
D. internus.
E. superficialis. - ✔✔E. superficialis.
The most common lever systems in the body are those that have the applied force between the fulcrum
and the load. These are called ________ levers.
A. first-class
B. second-class
C. third-class
D. fourth-class
, E. fifth-class - ✔✔C. third-class
The type of muscle fiber that is most resistant to fatigue is the ________ fiber.
A. high-density
B. anaerobic
C. intermediate
D. slow
E. fast - ✔✔D. slow
In a first-class lever __________.
A. the load is located between the applied force and the fulcrum
B. the fulcrum lies between the applied force and the load
C. the effective force is increased at the expense of speed and distance traveled
D. speed and distance traveled are increased at the expense of effective force - ✔✔B. the fulcrum lies
between the applied force and the load
The complex of a transverse tubule and two adjacent terminal cisternae is known as a(n)
A. sarcomere.
B. triad.
C. zone of overlap.
D. free head.
E. M line. - ✔✔B. triad.
At each end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium,
come together to form a
A. tendon.
B. ligament.
C. tenosynovium.
D. satellite cell.
E. sheath. - ✔✔A. tendon.
How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?
A. It would cause spastic paralysis (muscles are contracted and unable to relax).
B. It would produce muscle weakness.
C. It would make the muscles less excitable.
D. It would have little effect on skeletal muscles.
E. It would cause flaccid paralysis (muscles are relaxed and unable to contract). - ✔✔A. It would cause
spastic paralysis (muscles are contracted and unable to relax).
Damage to which of the following muscles would interfere most with the ability to breathe?
A. intercostals
B. platysma
C. rectus abdominis
D. digastric
E. pterygoid - ✔✔A. intercostals
Muscles visible at the body surface are often called
A. intrinsic.
B. profundus.
C. rectus.
D. internus.
E. superficialis. - ✔✔E. superficialis.
The most common lever systems in the body are those that have the applied force between the fulcrum
and the load. These are called ________ levers.
A. first-class
B. second-class
C. third-class
D. fourth-class
, E. fifth-class - ✔✔C. third-class
The type of muscle fiber that is most resistant to fatigue is the ________ fiber.
A. high-density
B. anaerobic
C. intermediate
D. slow
E. fast - ✔✔D. slow
In a first-class lever __________.
A. the load is located between the applied force and the fulcrum
B. the fulcrum lies between the applied force and the load
C. the effective force is increased at the expense of speed and distance traveled
D. speed and distance traveled are increased at the expense of effective force - ✔✔B. the fulcrum lies
between the applied force and the load
The complex of a transverse tubule and two adjacent terminal cisternae is known as a(n)
A. sarcomere.
B. triad.
C. zone of overlap.
D. free head.
E. M line. - ✔✔B. triad.
At each end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium,
come together to form a
A. tendon.
B. ligament.
C. tenosynovium.
D. satellite cell.
E. sheath. - ✔✔A. tendon.
