1) What two systems make up the locomotor system? a) Nervous system and circulatory system b) Skeletal system and muscular system c) Respiratory system and digestive system d) Endocrine system and skeletal system 2) When the muscle receives an order from the brain... a) It expands and relaxes the bones b) It moves randomly c) It stops functioning d) It contracts and pulls the bones attached to it 3) What is the function of antagonistic muscles? a) They work together to contract at the same time b) One muscle contracts while the other relaxes 4) Which of the following is an example of antagonistic muscles? a) Quadriceps and clavicle b) Deltoid and biceps c) Biceps and triceps d) Both a and b 5) What happens during the flexing movement in the arm? a) The biceps contracts and the triceps relaxes b) The biceps relaxes and the triceps contracts c) Both muscles contract d) Both muscles relax 6) During extending movement of the arm, which muscle contracts? a) Biceps b) Triceps c) Both biceps and triceps d) None of them 7) Which bone does the biceps pull to bend the arm at the elbow? a) Ulna b) Humerus c) Radius d) Femur

How the locomotor system works

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