ASU BIO 201 Lab 2| Questions with 100% Correct
Solutions
muscle spindle fibers
help communicate to the nervous system
Gap junctions
Allow communication between cells
intercalated discs
Border of each cell, also serves as communication
circular structure
Fibers are arranged in concentric rings
Convergent/rádiate structure
Fibers are arranged in a broad, or flared, pattern from the origin to its insertion as a
single tendon
parallel/fusiform muscles
Fibers run parallel with the long axis of the muscle
pennate muscles
Fibers run at an angle relative to the tendons
frontalis muscle
raises eyebrows, wrinkles forehead
temporalis muscle
closes jaw
occipitalis muscle
pulls scalp posteriorly
orbicularis oculi muscle
closes eyelids
, Nasalis muscle
flares nostrils; compresses nasal cartilage
masseter muscle
principal muscle for jaw movement; closes jaw
buccinator muscle
compresses cheeks; aids in food position for chewing
modiolus muscle
intersection of facial muscles; provides stability for mouth movement and facial
expression
orbicularis oris muscle
closes mouth, puckers lips
Platysma muscle
creates downward sag of mouth; tenses skin of neck
Sternocleidomastoid muscle
Flexes and laterally rotates the head
suprahyoid muscles
Forms floor of oral cavity; provides an anchor for tongue; provides anchor for tongue;
moves larynx during swallowing
infrahyoid muscles
depresses hyoid bone and larynx during swallowing and speaking
external intercostal muscles
Elevates the rib cage; aids in inspiration
internal intercostal muscles
Depress rib cage; aids in expiration
Diaphram muscle
Inspiration; muscle shortening, flattens this muscle to increase lung volume
Solutions
muscle spindle fibers
help communicate to the nervous system
Gap junctions
Allow communication between cells
intercalated discs
Border of each cell, also serves as communication
circular structure
Fibers are arranged in concentric rings
Convergent/rádiate structure
Fibers are arranged in a broad, or flared, pattern from the origin to its insertion as a
single tendon
parallel/fusiform muscles
Fibers run parallel with the long axis of the muscle
pennate muscles
Fibers run at an angle relative to the tendons
frontalis muscle
raises eyebrows, wrinkles forehead
temporalis muscle
closes jaw
occipitalis muscle
pulls scalp posteriorly
orbicularis oculi muscle
closes eyelids
, Nasalis muscle
flares nostrils; compresses nasal cartilage
masseter muscle
principal muscle for jaw movement; closes jaw
buccinator muscle
compresses cheeks; aids in food position for chewing
modiolus muscle
intersection of facial muscles; provides stability for mouth movement and facial
expression
orbicularis oris muscle
closes mouth, puckers lips
Platysma muscle
creates downward sag of mouth; tenses skin of neck
Sternocleidomastoid muscle
Flexes and laterally rotates the head
suprahyoid muscles
Forms floor of oral cavity; provides an anchor for tongue; provides anchor for tongue;
moves larynx during swallowing
infrahyoid muscles
depresses hyoid bone and larynx during swallowing and speaking
external intercostal muscles
Elevates the rib cage; aids in inspiration
internal intercostal muscles
Depress rib cage; aids in expiration
Diaphram muscle
Inspiration; muscle shortening, flattens this muscle to increase lung volume
