MUSCLE human study guide lab

Rectus Abdominis

Flexes the vertebral column

Rectus Abdominis (labeling)

External Oblique

Rotate the Trunk

External Oblique(labeling)

Internal Oblique

Rotate the Trunk

Internal Oblique(labeling)

Transversus Abdominis

Biceps Brachii

Flexes the arm

Biceps Brachii(labeling

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Triceps Brachii

Rectus Femoris

Extends the knee

Rectus Femoris(labeling)

Sartorius

flexus, abducts, and latterly rotates

Satorius(labeling)

Gracilis

flexion, adduction, medial rotation of hip joint

Gracilis(labeling)

Gluteus Maximus

Gluteus Medius

Adducts the leg

Biceps Femoris

flexes the knee

Biceps Femoris(Labeling)

Semitendinosus

Flexes the knee too

Semimembranosus

Flexes the knee also

Hamstring Group

Biceps Femoris, Semitendinosus, Semimemranosus

Gastrocnemius

Flexes the foot

Gastrocnemius(labeling)

Tibialis Anterior

flexes the foot

Tibialis Anterior(labeling)

Epicranius Frontalis

Raises the eyebrow

Epicranius Occipitalis

Tenses and retracts the scalp

Orbicularius Oculi

preforms all eye movement

Obicularus Oris

closes the mouth with the lips

Buccinator

Flattens the cheek during chewing, holding them flat against the cheek

Sternocleidomastoid

rotates the head, flexes the neck

Trapezius

elevates and depresses the scapula

Trapezius(labeling)

Pectoralis major

adducts the humerus

Pectoralis major(labeling)

Latissimus Dorsi

Adducts the humerus

Latissimus Dorsi(labeling)

Deltoid

Adducts the arm

Deltoid(labeling)

Muscle Structure Hierarchy

Muscle → fascicle → muscle fiber → myofibril → sacromere → myofiliment

Actin Filaments

thin active filaments

Myosin Filaments

thick active filaments

Striations in muscle fibers

Repeating bands of the proteins actin(light) and myosin(dark) filaments in the myofibrils

The Sight where a motor neuron connects

The synapse is called the neuromuscular junction

The Neurotransmitter that stimulated muscle contraction

Acetylcholine

Calcium role

binds with the troponin causing tropomyosin to alter shape and move from myosin binding sights

What causes muscle fatigue

lack of lactic acid

Origin vs insertion

O is the attachment to an immoveable bone, I is the attachment to a moveable bone. When a muscle contracts, the i is pulled towards the o.

Why do muscles always work in antagonistic pairs

flexion and extension