Question

One of the primary muscles that birds use to fly is the pectoralis. (If you've ever eaten chicken or turkey breast, you've eaten pectoralis muscle). Like the homologous human muscle, it originates on the sternum and inserts on the humerus. Different species of birds vary greatly in their level of activity. Migratory birds can fly 1000's of miles, while non-migratory birds may spend their life flying in short bursts. Based on the drawing, when the pectoralis muscle contracts, the wing will be pulled Humerus Shoulder Joint Pectoralis Sternum Hint: Don't forget that bird wings are homologous to human arms. Which way do your arms move when your pectoralis muscle contracts? upwards downwards

          One of the primary muscles that birds use to fly is the pectoralis. (If you've ever eaten chicken or turkey breast, you've eaten pectoralis muscle). Like the homologous human muscle, it originates on the sternum and inserts on the humerus. Different species of birds vary greatly in their level of activity. Migratory birds can fly 1000's of miles, while non-migratory birds may spend their life flying in short bursts.

Based on the drawing, when the pectoralis muscle contracts, the wing will be pulled

Humerus
Shoulder Joint
Pectoralis
Sternum

Hint: Don't forget that bird wings are homologous to human arms. Which way do your arms move when your pectoralis muscle contracts?

upwards
downwards

One of the primary muscles that birds use to fly is the pectoralis. (If you've ever eaten chicken or turkey breast, you've eaten pectoralis muscle). Like the homologous human muscle, it originates on the sternum and inserts on the humerus. Different species of birds vary greatly in their level of activity. Migratory birds can fly 1000's of miles, while non-migratory birds may spend their life flying in short bursts.

Based on the drawing, when the pectoralis muscle contracts, the wing will be pulled

Humerus
Shoulder Joint
Pectoralis
Sternum

Hint: Don't forget that bird wings are homologous to human arms. Which way do your arms move when your pectoralis muscle contracts?

upwards
downwards

Added by Susan S.

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