Describe how third-class levers operate in terms of force moved and speed of movement. Provide an example of a third-class lever

What will be an ideal response?


Third-class levers have a mechanical disadvantage in terms of force. The fulcrum in a third-class lever is located closer to the applied force and farther from the load moved. Although third-class levers are disadvantaged in terms of force, they produce a speedy movement. An example of a third-class lever is the biceps brachii muscle. The fulcrum is at the elbow joint and the load of weight is the forearm and hand. The contraction of the biceps brachii muscle is the force that moves the forearm and hand.

Anatomy & Physiology

You might also like to view...

A membrane transport process is active if it requires ________

A) a concentration gradient B) energy provided by ATP C) kinetic energy of molecules D) a pressure difference

Anatomy & Physiology

Oxygen and carbon dioxide are transported between the blood and interstitial fluid by way of

A. diffusion from areas of higher concentration to lower concentration. B. active transport (using ATP) by protein carriers of endothelial cells. C. pinocytosis using fluid-filled vesicles. D. exocytosis and endocytosis by endothelial cells.

Anatomy & Physiology

The basal nuclei

A) initiate conscious motor activity. B) activate spinal reflexes. C) provide the background patterns of movement involved in voluntary motor activities. D) exert direct control over lower motor neurons. E) act as gatekeepers, filtering out unnecessary sensorimotor activity.

Anatomy & Physiology

Where is the inferior nasal concha?

a) A b) B c) C d) D e) E

Anatomy & Physiology