alleryStart learning →In the arm, what does the triceps muscle do?
AIt extends the limb, opening it out
BIt flexes the limb, closing it up
CIt rotates the limb about its long axis
DIt locks the elbow joint in one place
Answer & Solution
Correct answer: A. It extends the limb, opening it out
1. In the arm the biceps is a flexor, which closes the limb.
2. The triceps is the opposing muscle, an extensor that opens the limb.
3. This flexor and extensor pairing is typical of skeletal muscles in vertebrates.
4. Flexing the limb is the job of the biceps, so that option names the wrong muscle.
_Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.6 Forces and Torques in Muscles and Joints_
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