Name Date THE SKELETAL AND MUSCULAR SYSTEMS The Way Muscles Work Muscles work in
ID: 150148 • Letter: N
Question
Name Date THE SKELETAL AND MUSCULAR SYSTEMS The Way Muscles Work Muscles work in pairs to move bones and provide the skeletal system with motion. A good example of the way this works is found in the arm. When we bend our arms up and down, the tricep and bicep muscles are working together to perform the movement. Directions: Describe how the biceps and triceps work together to straighten and bend the arm Bending Arm Straightening Arm A muscle that bends bones at the joint are called flexors. A muscle that straightens bones at a joint ane called extensors. QUESTION: Looking back at the experiments with the arm, which muscle, front or back, is the flexor and which is the extensor? Flexor - ExtensorExplanation / Answer
Biceps muscle (Front) is responsble for the bending of arm and triceps muscle (back) is responsible for straightening of arm.
Most of the time both the muslces works together by contraction and relaxation (i.e shortening and lengthening) .
For example if we bends our arm then biceps muslce will go for shortening and triceps muscle will lengthens itself.(for bending of arm)
and if we straightens our arm from bend then triceps muscle will go for shortening and biceps muscle will lenghthens.(for straightening of arm)
In this way both the muslces works together.
This type of function of both muslces helps to acheive a controlled movement.
ques. 2) Biceps muscle is a Flexor
Triceps muscle is an Extensor
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