Skeletal Muscles Flashcards
One skeletal muscle cell is called a
muscle fiber
The cytoplasm is called the
sarcoplasm
Functional unit of a skeletal muscle fiber that actually shortens during contraction
sarcomere
Thick myofilaments are made of the protein
myosin
Thin myofilaments are made of the protein
actin
Actin bonds to thick myofilaments called
troponin
Troponin bonds to calium ions
tropomyosin
Calcium is stored within the
sarcoplasmic reticulum
T-tubules
are extensions of the plasma membrane that run deep within the skeletal muscle fiber
One _____extends between two z-discs.
sarcomere
Actin overlaps myosin in the
A-band
The I-bands only contains
Thin myofilaments
The thin myofilaments attach directly to
Z-discs
Springlike molecules that prevent the sarcomere from overstretching
Titin
Bundles of muscle fibers
fascicle
Epymisium
CT covering the entire muscle
Perymisium
Surrounds each bundle of muscle fibers.
Endomysium
CT covering each muscle fiber
Antagonist
Muscle that relaxes while others contract
Agonist
AKA a prime mover, contracts to carry out a specific movement
Synergist
Assists the agonist by causing a similar movement by stabilizing a joint
Quadriceps femoris
Rectus Femoris
Vastus lateralis
Vastus medialis
Vastus intermedialis
Hamstring
Biceps femoris
Semitendinoses
Semimembranosis
Two muscles that contribute to achilles tendon
Gastrocnemius
Soleus
Rotator cuff
Deltoid
Supraspinatus
Infraspinatus
Teres minor
Abdominal wall muscles
Rectus abdomis
Internal oblique
External oblique
Transverse abdominis
Normal inspiration
diaphragm
external intercostal
Forceful exhalation
Tire
Internal intercostal
Masseter
Chewing food
Orbicularis oris
Kiss/whistle
Orbicularis oculi
Close eyes
Sternocleidomastoid left
rotate head to right shoulder
Sternocleidomastoid right
tilt to right shoulder
Erector spinae
Keeps posture extends the spine
Compress the abdomen
tire
Flex vertebral column as you bend fwd from the waist
ire