Question

explain why the biceps muscle alone cannot make the arm straighten ?​

Answer 1

Answer:

When your biceps muscle in your upper arm contracts, it pulls your lower arm in towards your shoulder. However, when it relaxes, your biceps cannot push your arm back out. To do this, your triceps muscle, on the underside of your upper arm, contracts and straightens your arm out.

Answer 2

The biceps muscle alone cannot make the arm straighten because:

• Muscles can only contract in pairs, they always exist. The biceps muscle is a flexor in the arm, which means it closes the limb. The triceps muscle extends the limb as an extensor. Humans and other vertebrates' skeletal muscles, bones, and joints frequently have this arrangement. Greater forces are applied to the body by the majority of skeletal muscles than the limbs do to the outside world.
• Your lower arm is drawn toward your shoulder when your biceps muscle in your upper arm contracts. Your biceps, however, will be unable to pull your arm back out once it has relaxed. Your upper arm's triceps muscle, located on the underside, contracts to straighten your arm out.

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https://brainly.in/textbook-solutions/q-following-occurs-straighten-arm-biceps-triceps-contract

https://brainly.in/question/24072423

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