Question

this diagram is a model of a horses muscular system.
which statements are true about muscles?

• muscles can be attached to bones or to an exoskeleton.
• strong animals have muscles, and weak animals do not.
• each muscle is made up of one muscle cell.

Explanation:

1. For "Muscles can be attached to bones or to an exoskeleton": In vertebrates (like horses), muscles attach to bones; in arthropods (with exoskeletons), muscles attach to exoskeletons. This is true.
2. For "Strong animals have muscles, and weak animals do not": All animals (whether perceived as strong or weak) have muscles for movement and basic functions. Even "weak" animals like worms have muscle tissue. This is false.
3. For "Each muscle is made up of one muscle cell": A muscle is composed of many muscle fibers (cells) bundled together. This is false.

Answer:

The only true statement is: Muscles can be attached to bones or to an exoskeleton.