The diagram shows the muscles and bones of a chicken wing.
Link the letter of the muscle to its correct action.
C
This muscles relaxes when the lower wing is pulled towards the upper wing.
A
When this muscle contracts the lower wing is pulled towards the upper wing.
B
This muscle relaxes when the wing tip straightens out.
D
When this muscle contracts the wing tip straightens out.
To link the letter of the muscle to its correct action, we can determine the actions by looking at the descriptions provided.
C: This muscle relaxes when the lower wing is pulled towards the upper wing.
A: When this muscle contracts, the lower wing is pulled towards the upper wing.
B: This muscle relaxes when the wing tip straightens out.
D: When this muscle contracts, the wing tip straightens out.
By comparing these descriptions to the actions mentioned, we can make the following connections:
C corresponds to the action: Relaxing the muscle when the lower wing is pulled towards the upper wing.
A corresponds to the action: Contracting the muscle to pull the lower wing towards the upper wing.
B corresponds to the action: Relaxing the muscle when the wing tip straightens out.
D corresponds to the action: Contracting the muscle to straighten out the wing tip.
So, the correct letter linking is as follows:
C corresponds to the action of relaxing the muscle when the lower wing is pulled towards the upper wing.
A corresponds to the action of contracting the muscle to pull the lower wing towards the upper wing.
B corresponds to the action of relaxing the muscle when the wing tip straightens out.
D corresponds to the action of contracting the muscle to straighten out the wing tip.