Human Shoulders, Arms, and Hands (Grades 5 to 7)

Human Shoulders, Arms, and Hands (Grades 5 to 7)

Human Shoulders, Arms, and Hands (Grades 5 to 7)
Reading Level

	edHelper's suggested reading level:	grades 5 to 7
	Flesch-Kincaid grade level:	5.7

Vocabulary

challenging words:

crossbar, radius, system, carpal, pointer, chops, meaning, breastbone, girdle, running, injury, separate, form, scientific, upper, lower

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Human Shoulders, Arms, and Hands
By Jennifer Kenny

¹     An adult's skeletal system is made of 206 bones. Some of those, of course, are part of the shoulders, arms, and hands.

²     The shoulders are actually made of bones, muscles, and connective-tissue straps. Your arms are suspended from these hangers called shoulders.

³     The scapulae, or shoulder blades, are actually two large, flat triangular bones. They look like wings on the back of a skinny person. They are held in place by many ligaments and muscles. They are connected to the top portion of the ribs by the clavicles, or collarbones. You can see and feel the collarbones on the upper part of the chest below the neck. The collarbones are connected to the breastbone and shoulder blade. Together, the collarbones and shoulder blades form a crossbar called a shoulder girdle so the arms can hang.

⁴     The arms are attached to the shoulders at the ball-and-socket joint. This kind of joint lets you twist and swing your arms. Strong muscles, which cover the back and shoulder, also play an important part in letting you move your arm, lift heavy objects, and provide support for your head and neck. To keep such an important part of the body safe from injury, different kinds of special gear have been created for soldiers and athletes.

Paragraphs 5 to 12:
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