BIOL251 Human Anatomy & Physiology I w/Lab 2026 | Module 5 Exam Review |70+ Questions and Answers Summary |LockDown Browser |Portage Learning

BIOL 251: Human Anatomy & Physiology I w/Lab 2026 - 2027
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Module 5: Skeletal Muscle Tissue
Complete Exam Review Questions with Verified Answers |
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Question 1
Which factors were used to name the tibialis anterior muscle? (Select all
that apply)
A) Size
B) Movement
C) Anatomical region
D) Shape
E) Number of origins
Correct Answer: C) Anatomical region and A) Size
Explanation: The tibialis anterior muscle is named based on its
anatomical region (tibia/tibial area) and its size (anterior indicates
position, but the name reflects the region). Movement is not a
naming factor for this muscle. Muscles can be named by: location
(e.g., tibialis, frontalis), shape (e.g., deltoid, trapezius), size (e.g.,
gluteus maximus, minimus), direction of fibers (e.g., rectus,

,transversus), number of origins (e.g., biceps, triceps), action (e.g.,
flexor, extensor), and attachment points .


Question 2
Which muscle compresses the cheek and is used for suction?
A) Mentalis
B) Buccinator
C) Scalenes
D) Risorius
Correct Answer: B) Buccinator
Explanation: The buccinator muscle compresses the cheek and is
used for sucking, blowing, and chewing. It is located in the cheek wall
and is innervated by the facial nerve (CN VII). The mentalis wrinkles
the chin and protrudes the lower lip, the scalenes elevate ribs 1-2
for inspiration, and the risorius pulls the corners of the mouth
laterally .


Question 3
Which muscle wrinkles the chin and protrudes the lower lip?
A) Buccinator
B) Mentalis

,C) Scalenes
D) Risorius
Correct Answer: B) Mentalis
Explanation: The mentalis muscle wrinkles the chin and protrudes
the lower lip. It originates from the mandible and inserts into the
skin of the chin. The buccinator compresses the cheek, the scalenes
elevate ribs, and the risorius pulls the corners of the mouth
laterally. The mentalis is innervated by the facial nerve (CN VII) .


Question 4
Which muscles elevate ribs 1-2 for inspiration?
A) Buccinator
B) Mentalis
C) Scalenes
D) Risorius
Correct Answer: C) Scalenes
Explanation: The scalenes (anterior, middle, and posterior) elevate
ribs 1-2 during forced inspiration. They originate from the cervical
vertebrae and insert into the first two ribs. The buccinator is a
facial muscle, the mentalis wrinkles the chin, and the risorius pulls
the mouth laterally. The scalenes are considered accessory muscles
of respiration .

, Question 5
Which muscle pulls the corners of the mouth laterally and tenses the lips?
A) Buccinator
B) Mentalis
C) Scalenes
D) Risorius
Correct Answer: D) Risorius
Explanation: The risorius muscle pulls the corners of the mouth
laterally and tenses the lips, producing a smile or grimace. It
originates from the fascia of the masseter and inserts into the angle
of the mouth. The buccinator compresses the cheek, the mentalis
wrinkles the chin, and the scalenes elevate ribs .


Question 6
The rectus abdominis muscle extends the trunk and compresses the
abdominal contents.
A) True
B) False
Correct Answer: B) False
Explanation: The rectus abdominis FLEXES the trunk (not extends)
and compresses the abdominal contents. It is a long, vertical muscle