Experiment 4 Gross Anatomy of the Muscular System Muscle actions are often described as a departure of the from the anatomical position of the body In performing the next exercise you will understand how muscles act to affect motion You must provide Materials Participant can be yourself Heavy Object approximately 5 pounds Table 2 Gross Anatomy Data Muscle s Activated Action s of Muscle s Triceps brachii Extends forearm Extensor digitorum Extends fingers Interosseous Retracts fingers 4 Forearm Pressed Down Upon Step 2 Brachioradialis Raises forearm 5 Elbow Bent Step 3 Biceps brachii Bends elbow 6 Arm Raised to Side with Heavy Object Step 4 Deltoid Raises arm up 7 Arm Extended Back with Heavy Object Step 4 Deltoid Extends arm back 8 lower limbs student selects action Gluteus maximus Extends thigh 9 lower limbs student selects action Rectus Femoris Extends lower leg 10 lower limbs student selects action Biceps femoris Flexes lower leg 11 lower limbs student selects action Tibialis anterior Flexes foot Movement 1 Forearm Extended Step 1 2 Fingers Extended and Splayed Step 1 3 Fingers Retracted Step 1 2013 eScience Labs LLC All Rights Reserved 12 lower limbs student selects action Flexor digitorum Flexes toes 13 lower limbs student selects action Fexor Hallicus Flexes big toe 14 lower limbs student selects action Extensor Halluces Extends big toe Post Lab Questions 1 Label the human muscle diagram Top to Bottom Pectoralis Major Biceps Flexor Carpi Flexor Digitorum Sartorius Quadricep Tibialis anterior 2 Which muscle s were used to extend your arm backwards The latissimus dorsi and the teres major are used to extend your arm backwards 2013 eScience Labs LLC All Rights Reserved 3 Which muscle s were used to extend and splay your fingers outward The extensor digitorum was used to extend and splay my fingers outward 2013 eScience Labs LLC All Rights Reserved
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