Joints
Human has 305 bones at birth but it remains 206 bones at adulthood as some of the bones have fused together.
Backbone
Cockroach
Birds
Fish
Snakes
- Two-part of our body seem to be joined.
The following types of joints in our body
- Ball joints
- It is like a ball rotates freely inside the bowl.
- Such joint allows movement in all the direction, example, Shoulder joint
- Pivotal Joints
- Our neck joins the head is an example of pivotal joints.
- It allows our head:
- Forward and backward movement
- Right and left
- Hinge Joints
- Door opening and closing is the example of a hinge joint.
- For example, Knee and elbow are the examples of a hinge joint, it allows only back and forwards movement.
- Fixed Joints
- Bones can not move at these joints. For example, the upper jaw and the head is the example of a fixed joint. The only lower jaw can go away from your head.
Human has 305 bones at birth but it remains 206 bones at adulthood as some of the bones have fused together.
Backbone
- Made up of many small bones called vertebrae, there are 33 vertebrae.
- Below the stomach.
- Some Skeleton that is not as hard as other bones and that can be bend, is called cartilage. For example, ear bone, nose bone.
- Muscle bulged due to Cantraction( it become smaller in length)
- Earthworm does not have bones, it has muscles which help to extend and shorten the body.
- Snail has no bones
Cockroach
- It has three pair of legs
- Two pair of wings
- Hard outer Skeleton
Birds
- Bones are hollow and light
- Bones of hinge limbs are typical for walking
- Shoulder bones are strong
Fish
- Head & tail of fish are smaller than the middle portioned of body
- This body shape is called streamlined which helps them to swim.
Snakes
- Have a long backbone and thin muscles. They Slither or Crawls for movement.
ConversionConversion EmoticonEmoticon