BIOL 235 Midterm Exam 2 With Complete Solution(100% Verified) 200+
Questions with 100% Correct Answers With well detailed Rationales/Grade A+
Assured
Question 1
In the musculoskeletal system, which attachment site of a muscle is typically located proximally
in the limbs and remains relatively stationary during a contraction?
A) Insertion
B) Belly
C) Origin
D) Tendon
E) Fulcrum
Correct Answer: C) Origin
Rationale: The origin is the attachment of a muscle's tendon to the stationary bone, which is
usually proximal in the limbs. The insertion is the attachment to the movable bone, usually
distal. During contraction, the insertion is typically pulled toward the origin.
Question 2
What specific phenomenon occurs when the positions of the origin and insertion of a muscle are
functionally switched during certain movements?
A) Isometric contraction
B) Isotonic eccentric contraction
C) Reverse Muscle Action
D) Antagonistic inhibition
E) Synergistic stabilization
Correct Answer: C) Reverse Muscle Action
Rationale: Reverse Muscle Action (RMA) happens when the bone that usually serves as the
origin moves, and the bone that usually serves as the insertion remains fixed. For example,
during a pull-up, the humerus moves toward the forearm rather than the forearm moving
toward the humerus.
Question 3
In the context of human movement, bones act as levers while joints act as the ________ for those
levers.
A) Effort
B) Load
C) Fulcrum
D) Resistance
E) Pulley
, 2
Correct Answer: C) fulcrum
Rationale: A lever is a rigid structure that moves around a fixed point called a fulcrum. In
the human body, the long bones serve as the lever arms, the joints provide the pivot point
(fulcrum), and muscle contraction provides the effort needed to move a load (the weight of
the body part).
Question 4
A mechanical advantage is achieved in a lever system when:
A) The load is closer to the fulcrum than the effort.
B) The effort is closer to the fulcrum than the load.
C) The effort and load are equidistant from the fulcrum.
D) The joint is in a fully extended position.
E) The muscle is undergoing an eccentric contraction.
Correct Answer: A) if the load is closer to the fulcrum and the effort is farther from the
fulcrum only a small about of effort is needed to move the load
Rationale: This is the principle of leverage. When the effort arm is longer than the load
arm, the system provides a mechanical advantage, allowing a small force (muscle
contraction) to move a much heavier weight.
Question 5
During a specific movement, the muscle that contracts to produce the desired action is the
________, while the muscle that must stretch and yield is the ________.
A) Antagonist; Agonist
B) Agonist; Antagonist
C) Synergist; Fixator
D) Fixator; Synergist
E) Prime Mover; Synergist
Correct Answer: B) Agonist; Antagonist
Rationale: The Agonist (Prime Mover) is the leader that contracts to cause a movement. The
Antagonist has the opposite action and must relax and lengthen to allow the Agonist to
move the limb. This relationship is regulated by reciprocal innervation.
Question 6
Which classification is given to muscles that contract and stabilize intermediate joints to prevent
unwanted movements during a prime action?
A) Antagonists
B) Agonists
C) Synergists
D) Fixators
E) Extensors
, 3
Correct Answer: C) synergists
Rationale: Synergists assist the prime mover by adding extra force to the same movement or
by reducing unnecessary movements at intermediate joints. This allows the prime mover to
act more efficiently on its primary target joint.
Question 7
A group of skeletal muscles, along with their associated blood vessels and nerves, that are
wrapped in a common sheath of fascia is called a:
A) Plexus
B) Ganglion
C) Compartment
D) Bundle
E) Myofibril
Correct Answer: C) Compartment
Rationale: In the limbs, skeletal muscles with similar functions are organized into
compartments by deep fascia. Each compartment typically has its own distinct nerve and
blood supply. Pressure buildup within these areas can lead to medical emergencies like
"compartment syndrome."
Question 8
What are the specific origin and insertion points for the Masseter muscle?
A) Origin: Mandible; Insertion: Maxilla
B) Origin: Zygomatic arch; Insertion: Ramus of mandible
C) Origin: Maxilla and zygomatic arch; Insertion: Angle and ramus of the mandible
D) Origin: Temporal bone; Insertion: Coronoid process of mandible
E) Origin: Sphenoid bone; Insertion: Ramus of mandible
Correct Answer: C) Origin = maxilla and zygomatic arch; Insertion = angle and ramus of
the mandible
Rationale: The Masseter is a powerful muscle of mastication. Its origin on the maxilla and
zygomatic arch provides a stable anchor, and its insertion on the mandible allows it to
elevate the jaw with great force to close the mouth.
Question 9
The Deltoid muscle is the primary abductor of the arm. Which of the following describes its
origin?
A) The greater tubercle of the humerus
B) The acromial extremity of the clavicle, acromion, and spine of the scapula
C) The coracoid process of the scapula
D) The deltoid tuberosity of the humerus
E) The lateral border of the scapula
, 4
Correct Answer: B) acromial extremity of clavicle, acromion, and spine of scapula
Rationale: The deltoid has a broad, multipennate origin that spans the clavicle and parts of
the scapula. This allows it to perform multiple actions: the anterior fibers flex, the lateral
fibers abduct, and the posterior fibers extend the arm.
Question 10
Which three muscles comprise the "Hamstring" group located in the posterior thigh?
A) Rectus femoris, vastus lateralis, vastus medialis
B) Semimembranosus, semitendinosus, biceps femoris
C) Gracilis, sartorius, pectineus
D) Gastrocnemius, soleus, plantaris
E) Adductor longus, adductor brevis, adductor magnus
Correct Answer: B) semimebranosous, semitendinosus, biceps femoris
Rationale: The hamstrings originate on the ischial tuberosity and cross two joints (hip and
knee). Together, they are responsible for extending the hip and flexing the knee.
Question 11
Which four muscles collectively make up the Quadriceps femoris group?
A) Semimembranosus, semitendinosus, biceps femoris, gracilis
B) Rectus femoris, vastus lateralis, vastus medialis, vastus intermedius
C) Sartorius, pectineus, adductor longus, iliacus
D) Gluteus maximus, medius, minimus, and piriformis
E) Rectus femoris, vastus lateralis, biceps femoris, and gracilis
Correct Answer: B) rectus femoris, vastus lateralis, vastus medialis, vastus intermedialis
Rationale: The "Quads" are the powerful extensors of the knee. The rectus femoris is the
only head of the group that crosses the hip joint, allowing it to assist in hip flexion as well as
knee extension.
Question 12
In the nervous system, what is the term for a small mass of nervous tissue consisting primarily of
neuron cell bodies located outside the CNS?
A) Nucleus
B) Nerve
C) Ganglia
D) Tract
E) Plexus
Correct Answer: C) Ganglia
Rationale: While a collection of cell bodies within the CNS is called a nucleus, a collection of
Questions with 100% Correct Answers With well detailed Rationales/Grade A+
Assured
Question 1
In the musculoskeletal system, which attachment site of a muscle is typically located proximally
in the limbs and remains relatively stationary during a contraction?
A) Insertion
B) Belly
C) Origin
D) Tendon
E) Fulcrum
Correct Answer: C) Origin
Rationale: The origin is the attachment of a muscle's tendon to the stationary bone, which is
usually proximal in the limbs. The insertion is the attachment to the movable bone, usually
distal. During contraction, the insertion is typically pulled toward the origin.
Question 2
What specific phenomenon occurs when the positions of the origin and insertion of a muscle are
functionally switched during certain movements?
A) Isometric contraction
B) Isotonic eccentric contraction
C) Reverse Muscle Action
D) Antagonistic inhibition
E) Synergistic stabilization
Correct Answer: C) Reverse Muscle Action
Rationale: Reverse Muscle Action (RMA) happens when the bone that usually serves as the
origin moves, and the bone that usually serves as the insertion remains fixed. For example,
during a pull-up, the humerus moves toward the forearm rather than the forearm moving
toward the humerus.
Question 3
In the context of human movement, bones act as levers while joints act as the ________ for those
levers.
A) Effort
B) Load
C) Fulcrum
D) Resistance
E) Pulley
, 2
Correct Answer: C) fulcrum
Rationale: A lever is a rigid structure that moves around a fixed point called a fulcrum. In
the human body, the long bones serve as the lever arms, the joints provide the pivot point
(fulcrum), and muscle contraction provides the effort needed to move a load (the weight of
the body part).
Question 4
A mechanical advantage is achieved in a lever system when:
A) The load is closer to the fulcrum than the effort.
B) The effort is closer to the fulcrum than the load.
C) The effort and load are equidistant from the fulcrum.
D) The joint is in a fully extended position.
E) The muscle is undergoing an eccentric contraction.
Correct Answer: A) if the load is closer to the fulcrum and the effort is farther from the
fulcrum only a small about of effort is needed to move the load
Rationale: This is the principle of leverage. When the effort arm is longer than the load
arm, the system provides a mechanical advantage, allowing a small force (muscle
contraction) to move a much heavier weight.
Question 5
During a specific movement, the muscle that contracts to produce the desired action is the
________, while the muscle that must stretch and yield is the ________.
A) Antagonist; Agonist
B) Agonist; Antagonist
C) Synergist; Fixator
D) Fixator; Synergist
E) Prime Mover; Synergist
Correct Answer: B) Agonist; Antagonist
Rationale: The Agonist (Prime Mover) is the leader that contracts to cause a movement. The
Antagonist has the opposite action and must relax and lengthen to allow the Agonist to
move the limb. This relationship is regulated by reciprocal innervation.
Question 6
Which classification is given to muscles that contract and stabilize intermediate joints to prevent
unwanted movements during a prime action?
A) Antagonists
B) Agonists
C) Synergists
D) Fixators
E) Extensors
, 3
Correct Answer: C) synergists
Rationale: Synergists assist the prime mover by adding extra force to the same movement or
by reducing unnecessary movements at intermediate joints. This allows the prime mover to
act more efficiently on its primary target joint.
Question 7
A group of skeletal muscles, along with their associated blood vessels and nerves, that are
wrapped in a common sheath of fascia is called a:
A) Plexus
B) Ganglion
C) Compartment
D) Bundle
E) Myofibril
Correct Answer: C) Compartment
Rationale: In the limbs, skeletal muscles with similar functions are organized into
compartments by deep fascia. Each compartment typically has its own distinct nerve and
blood supply. Pressure buildup within these areas can lead to medical emergencies like
"compartment syndrome."
Question 8
What are the specific origin and insertion points for the Masseter muscle?
A) Origin: Mandible; Insertion: Maxilla
B) Origin: Zygomatic arch; Insertion: Ramus of mandible
C) Origin: Maxilla and zygomatic arch; Insertion: Angle and ramus of the mandible
D) Origin: Temporal bone; Insertion: Coronoid process of mandible
E) Origin: Sphenoid bone; Insertion: Ramus of mandible
Correct Answer: C) Origin = maxilla and zygomatic arch; Insertion = angle and ramus of
the mandible
Rationale: The Masseter is a powerful muscle of mastication. Its origin on the maxilla and
zygomatic arch provides a stable anchor, and its insertion on the mandible allows it to
elevate the jaw with great force to close the mouth.
Question 9
The Deltoid muscle is the primary abductor of the arm. Which of the following describes its
origin?
A) The greater tubercle of the humerus
B) The acromial extremity of the clavicle, acromion, and spine of the scapula
C) The coracoid process of the scapula
D) The deltoid tuberosity of the humerus
E) The lateral border of the scapula
, 4
Correct Answer: B) acromial extremity of clavicle, acromion, and spine of scapula
Rationale: The deltoid has a broad, multipennate origin that spans the clavicle and parts of
the scapula. This allows it to perform multiple actions: the anterior fibers flex, the lateral
fibers abduct, and the posterior fibers extend the arm.
Question 10
Which three muscles comprise the "Hamstring" group located in the posterior thigh?
A) Rectus femoris, vastus lateralis, vastus medialis
B) Semimembranosus, semitendinosus, biceps femoris
C) Gracilis, sartorius, pectineus
D) Gastrocnemius, soleus, plantaris
E) Adductor longus, adductor brevis, adductor magnus
Correct Answer: B) semimebranosous, semitendinosus, biceps femoris
Rationale: The hamstrings originate on the ischial tuberosity and cross two joints (hip and
knee). Together, they are responsible for extending the hip and flexing the knee.
Question 11
Which four muscles collectively make up the Quadriceps femoris group?
A) Semimembranosus, semitendinosus, biceps femoris, gracilis
B) Rectus femoris, vastus lateralis, vastus medialis, vastus intermedius
C) Sartorius, pectineus, adductor longus, iliacus
D) Gluteus maximus, medius, minimus, and piriformis
E) Rectus femoris, vastus lateralis, biceps femoris, and gracilis
Correct Answer: B) rectus femoris, vastus lateralis, vastus medialis, vastus intermedialis
Rationale: The "Quads" are the powerful extensors of the knee. The rectus femoris is the
only head of the group that crosses the hip joint, allowing it to assist in hip flexion as well as
knee extension.
Question 12
In the nervous system, what is the term for a small mass of nervous tissue consisting primarily of
neuron cell bodies located outside the CNS?
A) Nucleus
B) Nerve
C) Ganglia
D) Tract
E) Plexus
Correct Answer: C) Ganglia
Rationale: While a collection of cell bodies within the CNS is called a nucleus, a collection of
