Muscle Organization
Thin filaments are made of protein molecules called___
actin
What are the 4 muscles that make up the rotator cuff? (S.I.T.S)
supraspinatus, infraspinatus, teres minor, subscapularis
When a muscle undergoes atrophy it
Decreases in size and density
The "six pack" muscles are called
rectus abdominis
Muscles only______,they don't push.
pull
Wrapped in perimysium
Fascicles
What muscle is named for its triangular shape?
Deltoid
The ability of a tissue to be able to respond to a stimulus is defined as
excitability
This muscle flexes the trunk and pulls the upper and lower body together.
rectus abdominis
Muscles that work with prime movers by providing the opposing action is the _____________.
Antagonist
Which muscle cells have more than one nucleus, are striated and are controlled voluntarily?
Skeletal
The straight muscle in the middle of the quadriceps group is the
rectus femoris
The event that occurs after a person dies where the muscles become locked creating stiffness in the body is known as
rigor mortis
This broad back muscle is responsible for shoulder adduction and scapular depression, gives swimmers and body builders "wings".
The antagonist of the biceps brachii
triceps brachii
The contractile unit of a skeletal muscle, situated between the Z-lines is called
Sarcomere
Which muscle is primarily being used when the foot is dorsiflexed or inverted
Tibialis Anterior
A genetic disorder that causes a person to not produce the protein dystrophin causing a person to lose muscle and become weaker, eventually losing their ability to move is called
muscular dystrophy
Transverse abdominis
Production of energy with oxygen is called__________.
aerobic respiration
What are 3 general functions of the muscular system
Movement
Heat Production
Posture
Large, bulky muscle on the posterior aspect of your pelvis that extends your hip is the
gluteus maximus
This muscular syndrome is when the jaw is misaligned causing grinding or clenching of the teeth.
TMJ (temporomandibular joint) syndrome
A thin sheath of connective tissue that helps connect your muscles to your bones.
The energy required for muscle contraction and a muscle cramp is most likely due to a lack of
ATP