Provide 2 EXAMPLES for first and second class levers in the body. If a muscle can...

Provide 2 EXAMPLES for first and second class levers in the body. If a muscle can create more than one movement explain how and why this is possible.

Expert Solution

--> Examples for first and second class levers:

First class lever: A first class lever is a bar which is having a fulcrum between the points where force is applied and exerted. Examples of a first class lever are pliers, scissors, crowbar, a see-saw, where it has an acis located between weight and force.

Second class lever: In a second class lever, the load will be between the force/effort and the fulcrum. Examples of a second class lever are wheelbarrow (effort moves a large distance to lift heavy load with wheel and axle as fulcrum), and other example of a second class lever is found in lower leg when a person standing on tiptoes.

--> Reason for a muscle working in more than one movement:

Muscles usually work in pairs (more than one movement) or groups like the biceps flexing the elbow and the triceps extending it, known as 'antagonistic muscle action', by creating the normal range of movement in a joint with contraction. Another reason why the muscle works in more than one movement is that, it contracts and pulls in opposite direction to straighten the joint again (skeletal muscle).
In the antagonist muscle pair, one muscle contract and the other muscle relax or lengthen.

Thank you!

Sydney Mullin answered 1 year ago

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