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56 terms

Muscular System Ch 7 Its easy!

Structure and Function of the Body Med Tech of Greenwood
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Skeletal Muscle
Attaches to bone, striated, and voluntary
Cardiac Muscle
Cross striations, intercalated disks, and involuntary
Smooth Muscle
single nucleus, non-striated,involuntary, also called viseral muscle
Fascia
loose connective tissue outside the muscle organs that forms a flexible, sticky "packing material" between muscle, bones, and skin.
Origin
muscle's attachement to more stationary bone
Insertion
Muscles attachment to more moveable bone
Myosin
Thick myofilaments are formed from this protein
Actin
Thin myofilaments are composed mainly form this protein
Sacromere
Basic Contractile unit of skeletal muscle and are separated by z lines or z disks
Prime Mover
The muscle that is mainly responsible for that movement (contract)
Synergist
Helpers in producing a muscle movement(contract)
Antagonist
(relax) produce movements opposite to synergist and prime mover
Tonic Contraction
responsible for body posture
Red Fibers
"slow fibers" high content of oxygen storing myoglobin ex. long distance running
White Fibers
"fast fibers" low red myoglobin content ex. weight lifting or sprinting
Threshold Stimulus
The minimum level of stimulation required to cause a fiber to contract
Tetanic Contraction
Contractions melt together to produce a sustained contration or TETANUS
Isotonic Contraction
Produces movement at the joint, muscle changes length, and the insertion end moves relative to point of origin
Concentric Contraction
Muscle shortens( isotonic) ex. Lifting Book
Eccentric Contration
Muscle Lengthens (isotonic) ex. Lowering the book
Isometric Contractions
no change in length of muscle ex. pushing against a wall
Flexion
Makes angle between the bones at the joint smaller ex. bending
Extenision
Makes angle between the bones at the joint larger ex. straightening or stretching
Dorsiflexion
toes pointed upward
Plantar Flexion
Standing on toes
Inversion
bottom of foot faces midline of body
Eversion
bottom of foot faces the side of the body
Frontal Muscle
Raise your eyebrows
Orbicularis oris
Kissing muscle
Zygomaticus
Smiling Muscle
Muscles of Mastication
closing mouth and chewing movements
Masseter
elevates mandible
temporal
assists masseter in closing jaw
Sternocleidomastoid and Trapezius(shrug)
Work together to flex the head on the chest
Pectoralis Major
Chest Flexes and helps adduct upper arm
Lattimus Dorsi
Lower Back Extends and helps adduct upper arm
Deltoid
Shouder and upper arm, Abducts upper arm
Biceps Brachii
Primary flexor of forarm, in the middle of the upper arm Flexes elbow (abduction)
Triceps Brachii
Posterior surface of upper arm Boxers Muscle, extends elbow
Orbicularis Oculi
Closes eye
External and internal Oblique and Transverse Abdominis
Compresses Abdomen
Rectus Abdominus
Flexes Trunk
Illiopsoas
Flexes thigh or trunk
Sartorius
Flexes thigh and rotates lower leg
Gluteus Maximus
Extends Thigh
ADDUCTOR GROUP-Adductor Longus, Gracilis, and Pectineus
Adducts Thigh
HAMSTRING GROUP- Semimembraneous semitendinosus, and biceps femoris
Flexes Knee
QUADRICEPS GROUP- Rectus Femoris, Vastus Lateralis, Intermedius, and Medialis
Extends Knee
Fibularis longus and brevis
evert and plantar flex ankle
Tibialis Anterior
Dorsiflexes ankle
Gastrocnemius and Soleus
Plantar Flexes Ankle
Layers of muscle from outer to inner
External Oblique, Internal Oblique, and Transverse Abdominis
Muscle Fiber
Another name for a muscle cell
Heart
Cardiac muscle makes up the bulk of the tissue of the
Movement, Posture, and Heat Production
3 Functions of the Skeletal System
lactic Acid
The Waste product produces when the muscle must switch to and energy supplying process that does not require oxygen