Muscles are flexible and elastic tissues that are attached to bones via tendons. They work in pairs, with one muscle contracting as the other relaxes to enable movement of the bones and joints. There are over 600 muscles in the human body that make up the locomotor system along with bones and joints.

1. Muscles

2. Bones, joints and muscles make up the
locomotor system.
Muscles are flexible and elastic.
Locomotor system

3. Muscles
-In our body, we have more than 600 muscles.
-Muscles work in pairs, when one muscle
contracts, the other one relaxes.
relaxed
contracted

4. Muscles
They are attached to the bones by
tendons

5. gluteal
muscles
intercostals
neck
muscles

6. Quiz
• 1. What attaches the muscles to the bones, tendons or
joints?
• 2. Are muscles hard and rigid or flexible and elastic?
• 3. This muscle is in the arm. Is it the biceps or the
quadriceps?
• 4. These muscles are in the trunk. They are between the
ribs. Are they the intercostal or the pectoral muscles?
• 5. Do muscles work on their own or in pairs?
• 6. When one muscle in a pair contracts does the other
muscle contract too or relax?

7. Answers
• 1.Tendons
• 2. Flexible and elastic.
• 3. The biceps.
• 4. Intercostal muscles
• 5. In pairs.
• 6. The other one relaxes.