Problem Analysis:
The worksheet is about understanding how muscles work during arm movements. The task involves filling in the blanks to describe what happens to the muscles when the arm is moved.
#### Key Concepts:
1.
Biceps Muscle: Located on the front of the upper arm. It contracts (shortens) to bend the arm.
2.
Triceps Muscle: Located on the back of the upper arm. It contracts to straighten the arm.
3.
Contraction: When a muscle shortens and becomes tense, it pulls on the bones to move them.
4.
Relaxation: When a muscle lengthens and becomes less tense, it allows the bones to move in the opposite direction.
Solution:
#### First Diagram:
The first diagram shows the biceps muscle contracting to bend the arm. The blank spaces need to be filled with words from the provided list:
lower, biceps, bend, contracts, up.
-
To _______ your arm the _______ muscle _______ pulling _______ your _______ arm.
-
To bend your arm, the
biceps muscle
contracts, pulling
up your
lower arm.
Filled Sentence:
To bend your arm the biceps muscle contracts pulling up your lower arm.
#### Second Diagram:
The second diagram shows the triceps muscle contracting to straighten the arm. The blank spaces need to be filled with words from the provided list:
triceps, relaxes, straighten, arm, down.
-
To _______ your arm the biceps muscle _______ while the _______ muscle contracts, pulling _______ the lower _______.
-
To straighten your arm, the
biceps muscle
relaxes while the
triceps muscle contracts, pulling
down the
lower arm.
Filled Sentence:
To straighten your arm the biceps muscle relaxes while the triceps muscle contracts, pulling down the lower arm.
Final Answer:
1.
First Diagram:
To bend your arm the biceps muscle contracts pulling up your lower arm.
2.
Second Diagram:
To straighten your arm the biceps muscle relaxes while the triceps muscle contracts, pulling down the lower arm.
Boxed Final Answer:
\[
\boxed{
\text{To bend your arm the biceps muscle contracts pulling up your lower arm.}
}
\]
\[
\boxed{
\text{To straighten your arm the biceps muscle relaxes while the triceps muscle contracts, pulling down the lower arm.}
}
\]
Parent Tip: Review the logic above to help your child master the concept of muscle worksheet.
