Locomotion in Animals

1) How Does a Streamlined Body Make It Easy for a Bird to Fly?

• While moving through the air, the birds feel a resistant force due to friction with the air.
• The streamlined shape of the bird’s body helps reduce this air friction.
• For the same reason, the shape of aeroplanes is also made streamlined.

2) What Is the Meaning of Girdle?

• Girdles are the joints where the upper limbs and lower limbs remain attached to the torso of our body.
• The upper limbs remain attached to pectoral girdles, whereas the lower limbs are to pelvic girdles.

3) What Are the Functions of the Skeletal System Other Than Locomotion?

The functions of the skeletal system other than locomotion are as follows—

• It provides a shape to our bodies.
• It protects the crucial organs of our body. For example—

The rib cage protects the lungs and heart.
The skull protects the brain.

4) How Do Muscles Play an Important Role in Locomotion?

The functions of the skeletal system other than locomotion are as follows—

• The muscles are attached to the bones of our skeletal system.
• They contract and relax to bring about the movement of bones.

5) We Can Move Our Necks Only Sideways. Mention the Reason Behind It.

The functions of the skeletal system other than locomotion are as follows—

• Our skeletal system has certain joints which join one bone to the other.
• The joint which joins our skull and neck is called the pivot joint.
• This pivot joint is specialised only to rotate around a single point; hence, it only allows the sideward movement of joints.

6) Can We Bend the Bone of Our Lower Arm From the Centre? State the Reason for Your Answer.

• The lower arm comprises two bones—the radius and ulna.
• These bones do not constitute any joints.
• Hence, we cannot move the lower arm separately.

7) List Some Important Bones Found in the Human Body.