Answer this :-
a) What is a hinge joint. Give example.
b) What are the special feature that help a bird fly?
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A) Hinge joints are a type of joint that functions much like the hinge on a door, allowing bones to move in one direction back and forth with limited motion along other planes. The fingers, toes, elbows, knees, and ankles contain hinge joints. Hinge joints are complex and contain many muscles and tissues.
B)Physical features
•lightweight, smooth feathers – this reduces the forces of weight and drag.
•a beak, instead of heavy, bony jaws and teeth – this reduces the force of weight.
•an enlarged breastbone called a sternum for flight muscle attachment – this helps with the force of thrust.
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