Question

You have ____________________ skeletal muscles. They work by ________________________ bones in different directions.

a. Approximately 300; by expanding and contracting
b. Around 600; by pulling on bones in different directions
c. Over 800; by pushing bones away
d. Roughly 400; by rotating bones on an axis

Answer 1

There are around 600 skeletal muscles that work by pulling on bones to facilitate movement(option b).

Step-by-step explanation:

You have around 600 skeletal muscles. They work by pulling on bones in different directions.

The correct answer is b. Around 600; by pulling on bones in different directions.

Skeletal muscles are responsible for movement by contracting and pulling on the bones they are attached to. For example, muscles like the biceps and triceps are arranged in pairs and work in opposition to facilitate movement. The biceps muscle is a flexor, which contracts to bend the limb, while the triceps muscle is an extensor, which contracts to straighten the limb.

Skeletal muscles vary in size and are connected to bones through the tendons close to joints. This arrangement allows for a mechanical advantage where the input force from muscle contraction is much greater than the output force applied onto the bone. Consequently, skeletal muscle pairs allow for a diverse range of motions, including bending and straightening of joints.