Excitation-contraction coupling occurs when depolarization of skeletal muscle cell results in a muscle action potential, which spreads across the cell surface and into the muscle fiber's network of _______________
answer
T tubules
question
The sliding filament mechanism of muscle contraction describes how myosin crossbridge heads bind to and pull actin towards the center of each ____________________, effectively shortening the muscle as it contracts.
lateral aspect of maxilla and lateral body of mandible
question
Which structure is highlighted?
answer
lateral pterygoid
question
Which structure is highlighted?
answer
masseter
question
Which structure is highlighted?
answer
medial pterygoid
question
Which structure is highlighted?
answer
occipitalis
question
Which structure is highlighted?
answer
orbicularis oculi
question
Which structure is highlighted?
answer
orbicularis oris
question
Which structure is highlighted?
answer
zygomaticus major
question
Which structure is highlighted?
answer
digastric
question
Which structure is highlighted?
answer
geniohyoid
question
What is the insertion of the highlighted muscle?
answer
mastoid process
question
Which structure is highlighted?
answer
mylohyoid
question
Which structure is highlighted?
answer
platysma
question
Which structure is highlighted?
answer
sternocleidomastoid
question
Which structure is highlighted?
answer
sternothyroid
question
Which structure is highlighted?
answer
stylohoid
question
What is the insertion of the highlighted muscle?
answer
superior angle and medial border of scapula
question
Which structure is highlighted?
answer
thyrohyoid
question
What is the action of the levator scapulae muscle?
answer
elevate scapula
question
Which structure is highlighted?
answer
levator scapulae
question
What is the origin of the highlighted muscle?
answer
medial part clavicle and manubrium of sternum
question
What is the unilateral action of the sternocleidomastoid muscle?
answer
rotation of head to opposite side
question
Which structure is highlighted?
answer
sternohyoid
question
Which structure is highlighted?
answer
extensor carpi radialis brevis
question
Which structure is highlighted?
answer
extensor carpi radialis longus
question
Which structure is highlighted?
answer
long head of biceps brachii
question
Which structure is highlighted?
answer
long head of triceps brachii
question
What is the insertion of the highlighted muscle?
answer
medial portion of intubercular sulcus of humerus
question
What is the insertion of the highlighted muscle?
answer
olecranon process
question
What is the origin of the highlighted muscle?
answer
supraspinous fossa
question
Which structure is highlighted?
answer
teres major
question
Which structure is highlighted?
answer
teres minor
question
Which structure is highlighted?
answer
erector spinae
question
What is the action of the erector spinae muscle?
answer
extension of the vertebral column and head
question
What is the action of the rectus abdominis muscle?
answer
flexion of trunk
question
Which structure is highlighted?
answer
iliocostalis part of erector spinae
question
Which structure is highlighted?
answer
internal intercostals
question
What is the insertion of the highlighted muscle?
answer
medial border of scapula
question
Which structure is highlighted?
answer
rectus abdominis
question
Which structure is highlighted?
answer
rhomboid major
question
Which structure is highlighted?
answer
rhomboid minor
question
What is the origin of the highlighted muscle?
answer
ribs 1 - 8
question
Which structure is highlighted?
answer
serratus anterior
question
What is the origin of the highlighted muscle?
answer
spinous process of T 2-5
question
What is the insertion of the highlighted muscle?
answer
xyphoid process of sternum and costal cartilages 5-7
question
Which structure is highlighted?
answer
biceps brachii
question
Which structure is highlighted?
answer
brachialis
question
Which structure is highlighted?
answer
coracobrachialis
question
What is the action of the triceps brachii muscle?
answer
extension of forearm
question
Which structure is highlighted?
answer
extensor carpi radialis brevis
question
Which structure is highlighted?
answer
extensor carpi radialis longus
question
Which structure is highlighted?
answer
extensor carpi ulnaris
question
Which structure is highlighted?
answer
extensor digitorum
question
Which structure is highlighted?
answer
flexor carpi radialis
question
Which structure is highlighted?
answer
flexor carpi ulnaris
question
What is the insertion of the highlighted muscle?
answer
greater tubercle of humerus
question
Which structure is highlighted?
answer
infraspinatus
question
Which structure is highlighted?
answer
lateral head of triceps
question
Which structure is highlighted?
answer
long head of biceps brachii
question
Which structure is highlighted?
answer
long head of triceps brachii
question
Which structure is highlighted?
answer
medial head of triceps brachii
question
What is the origin of the highlighted muscle?
answer
posterior proximal shaft of ulna
question
What is the insertion of the highlighted muscle?
answer
radial tuberosity
question
What is the origin of this highlighted muscle?
answer
shaft of humerus
question
What is the insertion of the highlighted muscle?
answer
shaft of radius
question
Which structure is highlighted?
answer
short head of biceps brachii
question
Which structure is highlighted?
answer
subscapularis
question
What is the action of the supinator muscle?
answer
supination of forearm
question
Which structure is highlighted?
answer
supinator
question
Which structure is highlighted?
answer
supraspinatus
question
What is the origin of the highlighted muscle?
answer
supraspinous fossa
question
Which structure is highlighted?
answer
teres minor
question
Which structure is highlighted?
answer
triceps brachii
question
What is the insertion of the highlighted muscle?
answer
ulnar tuberosity
question
Hamstring muscles: Identify the correct insertions or origins for the muscles labelled as Q, R, & S
answer
Q= Inserts on medial condyle of tibia
R= Inserts on proximal medial shaft of tibia
S= Inserts on head of fibula
question
What is the action of the gluteus maximus muscle?
answer
extension of thigh
question
What is the action of the adductor magnus muscle?
answer
adduction of thigh
question
Which structure is highlighted?
answer
adductor brevis
question
Which structure is highlighted?
answer
adductor longus
question
Which structure is highlighted?
answer
adductor magnus
question
Identify the origin / proximal attachment of the highlighted muscle.
answer
ala of illium
question
What is the origin / proximal attachment of the highlighted muscle?
answer
ala of illium
question
Identify the origin / proximal attachment of the highlighted muscle.
answer
ala of illium, sacrum, coccyx
question
What is the action of the iliopsoas muscle?
answer
flexion of thigh
question
Which structure is highlighted?
answer
gluteus maximus
question
Which structure is highlighted?
answer
gluteus medius
question
Which structure is highlighted?
answer
gluteus minimus
question
Which structure is highlighted?
answer
gracilis
question
What is the insertion of the highlighted muscle?
answer
greater trochanter
question
What is the insertion of this highlighted muscle?
answer
greater trochanter
question
Which structure is highlighted?
answer
iliacus
question
Which structure is highlighted?
answer
illiopsoas
question
Which structure is highlighted?
answer
pectineus
question
Which structure is highlighted?
answer
psoas major
question
What is the origin of the highlighted muscle?
answer
pubis
question
What is the insertion of the highlighted muscle?
answer
gluteal tuberosity of femur
question
What is the origin of the highlighted muscle?
answer
anterior superior iliac spine
question
Which structure is highlighted?
answer
biceps femoris long head
question
Which structure is highlighted?
answer
biceps femoris short head
question
What is the action of the quadriceps femoris muscle?
answer
extension of leg
question
What is the insertion of the highlighted muscle?
answer
head of fibula
question
Which structure is highlighted?
answer
illiotibial tract
question
What is the origin of the highlighted muscle?
answer
ischial tuberosity
question
What is the origin of the highlighted muscle?
answer
ischial tuberosity
question
What is the origin of the highlighted muscle?
answer
linea aspera of femur
question
What is the insertion of the highlighted muscle?
answer
medial condyle of tibia
question
What is the insertion of the highlighted muscle?
answer
proximal medial shaft of tibia
question
Which structure is highlighted?
answer
quadriceps femoris
question
Which structure is highlighted?
answer
sartorius
question
Which structure is highlighted?
answer
semimembranosus
question
Which structure is highlighted?
answer
semitendinosus
question
What is the insertion of the highlighted muscle?
answer
patella
question
Which structure is highlighted?
answer
tensor fascia lata
question
What is the insertion of the highlighted muscle?
answer
proximal medial shaft of tibia
question
What is the origin of the highlighted muscle?
answer
anterior lateral tibial shaft
question
Which structure is highlighted?
answer
calcaneal tendon
question
What is the insertion of the highlighted structure?
answer
calcaneus
question
Which structure is highlighted?
answer
extensor digitorum longus
question
Which structure is highlighted?
answer
extensor digitorum brevis
question
Which structure is highlighted?
answer
fibularis longus and brevis
question
What is the action of the gastrocnemius muscle?
answer
flexion of lower leg
question
Which structure is highlighted?
answer
flexor digitorum brevis
question
Which structure is highlighted?
answer
flexor digitorum longus
question
Which structure is highlighted?
answer
gastrocnemius
question
What is the origin of the lateral head of this highlighted muscle?
answer
lateral condyle of femur
question
What is the action of the soleus muscle?
answer
plantar flexion of foot
question
Which structure is highlighted?
answer
plantaris
question
Which structure is highlighted?
answer
popliteus
question
Which structure is highlighted?
answer
soleus
question
What is the origin of the highlighted muscle?
answer
tibia and fibula
question
Which structure is highlighted?
answer
tibialis anterior
question
Which structure is highlighted?
answer
tibialis posterior
question
What is the insertion of the highlighted muscle?
answer
metatarsal I and medial cuneiform
question
Identify the muscles that originate at the arrow
answer
zygomaticus, masseter, & levator labii superioris
question
Identify the action of the muscle that inserts at the arrows
answer
Supports pelvic viscera
question
Identify the muscles that insert at the arrow
answer
rectus femoris, vastus lateralis, vastus medialis, and vastus intermedialis
question
Identify the muscles indicated by the arrows
answer
X= Tensor fasciae latae;
Y= Sartorius
question
Larger muscles will produce EMG recordings that are ____________ as/than smaller muscles.
answer
larger, the size of the motor unit determines EMG output which is proportional to muscle size.
question
The measured distance between gastrocnemius and the spinal cord was 45 cm for a volunteer and the reflex latency calculated from powerlab recordings was 0.039 seconds . Set up the calculation for conduction velocity based on this data.
answer
(0.45 meters*2)/(0.039-0.002 seconds) OR
0.9 meters / 0.037 seconds
question
Identify the action of the muscle indicated below
answer
Extends leg (at knee)
question
Identify the structure and its origin
answer
Vastus intermedius,
Anterior and lateral surface of proximal femur shaft
question
Identify the structure and its insertion
answer
Sternothyroid,
Thyroid cartilage
question
How many motor units are present in this graph?
answer
7
question
Identify the insertion of the Platysma.
answer
Mandible (lower border); Skin and fascia of lower face; Blends with muscles of lower lip and angle of mouth
question
Identify the actions of the indicated muscle
answer
Flexion and adduction of humerus
question
Identify the structures indicated by the arrows X & Y
answer
X= Iliopsoas;
Y= Semitendinosus
question
Identify the origin of the indicated muscle
answer
Tibia (posterior middle shaft)
question
Which muscle has the following AOI?
Action: Abduction of toes; Flexion of metatarsophalangeal (MP) joints of toes; Extension of interphalangeal (IP) joints of toes
Origin: Metatarsals; Each attaches to adjacent sides of two metatarsals
Insertion: Extensor expansion over proximal phalanx (base) of each toe
answer
Dorsal interossei of the foot
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