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We are going to revise a little bit the locomotor system, okay?

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So I'm going to show you.

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The locomotor system, yes, allow us to move, okay?

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So we need our bones, we need our muscles, and we need our joints to walk, to run, to

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move, okay?

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First, bones.

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Bones are hard and rigid, okay?

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They are not flexible, okay?

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And we have 206 bones when we are adults, okay?

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The bones that you have to know are really easy.

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The skull that is located in your head, the backbone that is in your back, backbone also

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you can say spinal cord, the hip that is here, it's also in your torso, the femur that is

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located in your leg, and it is the longest bone in your body, the ribs that is located

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in your torso, in your chest, the humerus that is in your arm, okay?

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So these bones you have to know, okay?

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It's really easy.

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Remember, they are hard and rigid.

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What about the muscles?

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Muscles are different, okay?

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They help us move, okay?

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And they are soft and elastic, yes?

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The muscles that you have to know, the abdominal muscles that are in your torso, near your

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stomach, the pectoral muscles, yes?

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The biceps that are in your arms, the quadriceps in your leg, in the upper leg, and the calf

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muscles that are also in your leg, okay?

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Muscles, they are like a type of elastic tissue, okay?

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And when you make exercise, when you run, you play sports, yes, your muscles will be

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large, okay?

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What about the joints?

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A joint is the place where two bones meet, okay?

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So the joints connect one bone and another bone, okay?

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Some joints move and others don't, okay?

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For example, these joints are moving joints.

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The elbow in your arm, the wrist in your hand and arm, your ankle connects your foot and

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your leg, and the knee that is in your leg, okay?

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All these joints are moving joints.