The diagram below illustrates the arrangement of bones and muscles in the human arm.

(i) Name the bones labeled K and L
(ii) Explain how upward movement of the lower arm is brought about by bones and muscles shown in the diagram above.

Answer:

i)
Answer
- K:ulna
- L: humerus
ii)
-Movement of the lower arm take place at the elbow which is between ulna and the humorous muscles involved biceps and triceps which operate as a pair and their function is antagonistic. When the biceps muscles contract triceps muscles relax. This pulls ulna and radius upward thereby bending the arm or bringing the lower arm upward.

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The diagram below illustrates the arrangement of bones and muscles in the human arm. (i) Name the bones labeled K and L (ii) Explain how upward movement of the lower arm is brought about by bones and muscles shown in the diagram above.

The diagram below illustrates the arrangement of bones and muscles in the human arm.

(i) Name the bones labeled K and L
(ii) Explain how upward movement of the lower arm is brought about by bones and muscles shown in the diagram above.