1_what is a ball and socket joint?
2_why can we move our hand in all directions?
3_what is chitin?
4_what helps the fish swim in water easily?
5_How do our muscles work?
6_What are cartilages?
Answers
Answer:
1. Ball-and-socket joint, also called spheroidal joint, in vertebrate anatomy, a joint in which the rounded surface of a bone moves within a depression on another bone, allowing greater freedom of movement than any other kind of joint.
2. Due to the presence of ball and socket joints in shoulders.
3. a fibrous substance consisting of polysaccharides, which is the major constituent in the exoskeleton of arthropods and the cell walls of fungi.
4. Fish swim by flexing their bodies and tail back and forth. Fish stretch or expand their muscles on one side of their body, while relaxing the muscles on the other side. This motion moves them forward through the water. Fish use their back fin, called the caudal fin, to help push them through the water.
5. Muscles are attached to bones by tendons and help them to move. When a muscle contracts (bunches up), it gets shorter and so pulls on the bone it is attached to. When a muscle relaxes, it goes back to its normal size.
6. Cartilage is a tough but flexible tissue that is the main type of connective tissue in the body. Around 65–80% of cartilage is water, although that decreases in older people, and the rest is a gel-like substance called the 'matrix' that gives it its form and function.
Explanation:
3) A fibrous substance consisting of polysaccharides,which is a major constituent in the exoskeleton of arthropods and the cell wall of the fungi.
6)Cartilage is a tough but flexible tissue that is the main type of connective tissue in the body.
4) Fishes swim by flexing their bodies and tail back and forth.Fish stretch or expand their muscles on one side of their body, While relaxing the muscles on the other side. This motion most them forward through the water. Fish use their back fin called the the caudal fin, to help push them through the water.