Our Skeletal System and the Skin - Standard 6 - General Science - Balbharati
Our Skeletal System and the Skin
Exercise
Q. 1 Fill in the blanks with the proper word.
(a) The place where two or more bones are connected is called a joint.
(b) Cells of the epidermis contain a pigment called Melanin.
(c) Epidermis and dermis are the two layers of the human skin.
(d) The human skeletal system is divided into two parts.
Q. 2 Match the pairs.
| Group 'A' | Answers |
|---|---|
| Ball and socket joint | Shoulder |
| Hinge joint | Knee |
| Gliding joint | Wrist |
Q. 3 Right or wrong ? If wrong, write the correct sentence.
(a) Bones are soft.
Ans. Wrong. (Bones are hard.)
(b) The human skeleton protects the internal organs.
Ans. Right.
Q.4 Put a ✅ mark at the proper places.
(a) The system which gives a definite shape to our body.
⛞ Excretory system
⛞ Respiratory system
✅ Skeletal system
⛞ Circulatory system
(b) The ................ joint is seen in fingers and toes.
⛞ Hinge joint
⛞ Ball and socket joint
⛞ Immovable joint
✅ Gliding joint
Q. 5 Answer the following questions in your words.
(a) What are the functions of your skin?
Ans. 1. Protecting the internal parts of the body like muscles, bones, organ systems, etc.
2. Help preserve the moisture in the body.
3. Synthesizing vitamin ‘D’.
4. Releasing sweat to regulate body temperature.
5. Giving protection from the heat and cold.
6. The skin functions as the sensory organ of touch.
(b) What should you do to keep your bones strong and healthy?
Ans. To keep your bones strong and healthy, consume foods rich in calcium and vitamin D.
2. Engage in weight-bearing exercises like walking and dancing.
3. Avoid excessive intake of sodas and tobacco.
(c) What are the functions of the human skeletal system?
Ans. 1. Provides structural support and protects to internal organs and tissues.
2. Helps in the production of blood cells and storing minerals like calcium.
3. Enables movement by working with muscles.
4. Facilitating the body's posture and stability.
(d) Which are the various reasons due to which our bones might break there?
Ans. Bones can break (fracture) due to factors such as accidents, falls, sports injuries, osteoporosis (weakening of bones), repetitive stress and weakened bone structure.
(e) What are the different types of bones? How many types are there?
Ans. There are four types of bones in the human body.
1. Long Bones: Longer than they are wide, such as femur and humerus. It provides support and facilitates movement.
2. Short Bones: Roughly equal in length and width, like the bones of the wrist and ankle. Helps in stability and support.
3. Flat Bones: Thin and flat, such as the skull and sternum. Gives protection and provides a surface for muscle attachment.
4. Irregular Bones: Unique in shape and structure, such as vertebrae and facial bones. They have various functions, including protection and support.
Q. 6 What will happen if -?
(a) There are no joints in our body.
Ans. If there were no joints in our body, movement would be impossible. Joints allow flexibility. So activities like walking, bending, and grasping are possible.
(b) There is no melanin pigment in our skin.
Ans. Without melanin pigment in our skin, it would be pale or colorless. Melanin provides skin, hair, and eye colour, and protects against harmful UV radiation from the sun.
(c) Instead of 33 vertebrae in our body, we had one single and straight bone.
Ans. If we had one single and straight bone instead of 33 vertebrae, our spine's flexibility would be lost. This would severely impact our ability to bend, twist, and move comfortably.
Q. 7 Draw diagrams.
(a) Types of joints.
(b) Structure of the skin.
