Question

the picture shows how the skeletal system acts as lever. justify how the main function of the system are to act as a system of rod and levers , which are moved by the muscles.

Answer 1

Answer:

A lever is a rigid rod (usually a length of bone) that turns about a pivot (usually a joint). Levers can be used so that a small force can move a much bigger force. This is called mechanical advantage. ... In our bodies bones act as lever arms, joints act as pivots, and muscles provide the effort forces to move loads.

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Answer 2

ANSWER:-

A lever is a simple machine which consists of a beam or rigid rod pivoted at a fixed axis or fulcrum.

Justification of how the main function of the system is to act as a system of rods and levers, which are moved by the muscles are:-

• A first-class lever has an axis which is a fulcrum located between the weight can be termed resistance and the force.
• In the above example Class-| lever the joint between the head and the first vertebra which is the atlantooccipital joint. The weight or resistance is the head, the fulcrum is the joint, and the muscular action is the force that comes from any of the hind muscles affixing to the skull, such as the trapezius.

• In a second-class lever, the weight termed resistance is located between the axis which is the fulcrum and the force.
• In the above example a Class-|| lever is found in the lower leg when a person stands on tiptoes. The fulcrum is formed by the metatarsophalangeal joints, the resistance is the weight of the body, and the force is applied to the calcaneus bone which is the heel of the human body by the gastrocnemius and soleus muscles through the Achilles tendon.

• In a third-class lever, force is applied between the weight and the axis called a fulcrum.
• In the above example of Class-||| lever the elbow joint is the axis (fulcrum). The resistance or the weight is the forearm, wrist, and hand and the force is the biceps muscle while flexing the elbow.

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