Explain various kinds of joints found in our body and give example of each.
There are five types of joints in our body:
(i) Fixed joints: Those joints which do not allow movement are called fixed joint.
(ii) Ball and socket joint: This joint allows movement in all directions. The rounded end of one bone fits into the hollow space of other bone. For example, joint between upper arm and shoulder.
(iii) Pivotal joint: This type of joint allow movement in all planes, i.e. up and down, side and other planes. For example, head.
(iv) Hinge joint: The joint which allows movement only in one plane is called hinge joint. For example, fingers, knees.
(v) Gliding joint: These joints allow only a limited amount of movement of sliding nature of cartilage. For example, the joints of backbone.
Answer the following questions:
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?
Indicate ‘true' and false' among the following sentences:
(a) The movement and locomotion of all animals is exactly the same.
(b) The cartilages are harder than bones.
(c) The finger bones do not have joints.
(d) The fore arm has two bones.
(e) Cockroaches have an outer skeleton.
Many people suffer from a problem called arthritis. Explain its connection with movement.
Fill in the blanks:
(a) Joints of the bones help in the_____________ of the body.
(b) A combination of bones and cartilages forms the_______________ of the body.
(c) The bones at the elbow are joined by a______________
(d) The contraction of the____________ pulls the bones during
Match the items in column I with one or more items of column II:
Column I | Column II |
(i) Upper jaw | (a) have fins on the body |
(ii) Fish | (b) has an outer skeleton |
(iii) Ribs | (c) can fly in the air |
(iv) Snail | (d) is an immovable joint |
(v) Cockroach | (e) protect the heart |
(f) shows very slow movement | |
(g) have a streamlined body |