General Science Solutions for Class 6 Science Chapter 8 - our skeletal system and the skin

Maharashtra state board science Textbook Solutions for Class 6 Chapter 8  our skeletal system and the skin   textbook solutions are very important and crusial that helps the students in understanding the complex topics. Class 6 Science textbook solutions helps you in the preparation of class 6 science board examination as well as verious compititive entrance examinations also. Studying the class 6 science answers to the questions in the science textbook will check your understanding of a particular topic and helps you determine your strengths and weaknesses.



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Important points to remember :
  1. The various organs are safe within the body cavity. The human skeleton is a protective shell for all the internal organs. All the bones in the body along with the cartilage together form the skeletal system. 
  2. The skeleton gives shape and support to the body. y The outer covering of the body is called the skin. 
  3. The skeletal system and the skin perform the important function of protecting the body and the internal body parts. 
  4. We must take care of our skeletal system and skin. 
  5. The skull, the rib cage, the backbone and the bones of the arms and legs are the main parts of the human skeletal system.
  6. Epidermis and dermis are the two main layers of the human skin. As our body grows, the size and length of our bones increases. 
  7. Such changes in size and length can be seen in children according to age. However, the body continues to grow only up to a certain limit. The bones of taller people are longer.


Question 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.


Question 2: Match the pairs.
'A'                                         'B'
1) Ball and socket joint    a) Knee

2) Hinge joint.                    b) Wrist

3) Gliding joint.                 c) Shoulder

Answer:
1) Ball and socket joint. - -c) Shoulder
2) Hinge joint - a) Knee
3) Gliding joint - b) Wrist


Question 3: Right or wrong? If wrong, write the correct sentence.

a) Bones are soft- Wrong
Answer : Bones are hard and non flexible.

b)The human skeleton protects the internal organs- Right

Question 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

Answer : Skeletal system

(b) The ................ joint is seen in fingers and toes.
□Hinge joint
□Ball and socket joint
□Immovable joint
□Gliding joint

Answer Hinge point


Question 5: Answer the following questions in your words.

(a)What are the functions of your skin?
Answer : The most important functions of the skin are:
  1. Protection − The skin provides protection to the body from mechanical injury, ultraviolet rays, from disease-causing microbes, and prevents desiccation.
  2. Temperature regulation − The skin helps in the maintenance of body temperature at a constant.
  3. The skin contains numerous sense receptors, which help in perceiving the surroundings.
  4. The skin is also involved in the synthesis of vitamins such as Vitamin D.
  5. The skin also helps in disposing off the excess water and salt by evaporation.​


b)What should you do to keep your bones strong and healthy?
Answer : The following things should be done in order to keep our bones healthy and strong:
  1. Have calcium rich foods like milk, yoghurt as calcium is an important component of bones.
  2. We need to take enough vtiamin D as it helps in the absorption of calcium present in foods.
  3. Some other important nutrients like potassium, vitamin K and magnesium also help the body to absorb and use calcium. Daily exercise is required to keep our bones in a state of good health.


c) What are the functions of the human skeletal system?
Answer : The skeletal system includes all of the bones and joints in the body. It performs the following functions:
  1. gives a definite shape to the body
  2. provides support and protection for the soft tissues that make up the rest of the body
  3. provides attachment points for muscles to allow movements at the joints


d) Which are the various reasons due to which our bones might break
Answer :
  1. Bones are structurs which are hard and non flexible. The chances of breaking of bones occurs, if the bones are weak. There are various reasons due to which bones may become weak and may break:
  2. certain diseases can result in weakening of the bones and cause them to break. For example, osteoporosis and arthirits are diseases which result in the weakening of bones defeciency of nutrients like calcium and vitamin D certain stress or injury may result into fracturing of bones bone loss also occurs with age and thus making them more fragile alcohol and smoking also have a negative impact on bones and bone density


e) What are the different types of bones? How many types are there?
Answer : There are 4 types of bones:

1. Flat bones: They are thin shaped and, in some cases, provide mechanical protection to soft tissues beneath or enclosed by the flat bone.

2. Irregular bones: They have complicated shapes which cannot be classified as 'long', 'short' or 'flat'. Their shapes are due to the functions they fulfill within the body.

3. Long bones: These type of bones are longer than wider and they function to support the weight of the body and facilitate movement

4. Short bones: They are almost cube shaped bones as they are equal in their length and width.


Question 6: What will happen if -?

a)There are no joints in our body.
Answer :
 1.Joints are the places where 2 bones are        joined together.

 2.They permit the various kinds of       movement which we carry out in order to   fulfill our requirements.

 3 . In absences of these joints our body   would become stiff and we would not be   able to carry out our daily tasks.

b) There is no melanin pigment in our skin.
Answer : Melanin is a pigment which is found in skin and hair as well. It is important for two reasons,

1.firstly it imparts colour to our skin and the tone of our skin depends on the amount of melanin pigment,

2. secondly it protects our skin and the inner parts from ultravoilet rays. If the melaning pigment is absent, all the humans will have the same skin colour and we will become susceptible to the UV rays present in our atmosphere.

c) Instead of 33 vertebrae in our body, we had one single and straight bone.
Answer :
1. The 33 vertebrae together form the     structure which we know as spine.

2. They permit the movement of our spine     so that we can bend it easily and carry out   other functions.

3.  In other words we can say that they   provide flexibilty to the spine.

4.  If in place of them, only one single and     straight bone will be present then we   would loose our flexiblity and remain in   fixed positions.

5. We would always stand straight like a pole and would not be able to sit down or perform other activities.

Question 7: Draw diagrams.
a) Types of joints
Answer :

b) Structure of the skin
Answer :


# Can you Tell

1) Which organ helps us to sense whether something is hot or cold, rough or smooth, etc.?
Answer :
1.The skin is an important and large organ of all living things.

2.The skin has hair. There are nails on the skin at the tips of the fingers and toes.

3. The skin gives us the sense of touch. The skin is an important sensory organ of the body.


2. What happens when we walk or play in the hot sun?
Answer :
1.When we walk or play in the sun, we get tired, but at the same time our skin becomes wet. This is because of sweat.

2. In the skin, there are glands which secrete sweat. They are called sweat glands.

3.After playing in the hot sun or after hard physical labour, the temperature of the body rises. Then sweat is released.

4. It helps to reduce the temperature of the body. Our body temperature usually remains constant at approximately 370C.

3. Which colour of the skin will give greater protection from the sun’s rays?
Answer :
1.There are two types of    melanine, eumelanin which gives skin a brown colour (tan) and pheomelanin which gives skin a red colour (burn).

2. Regular sun exposure (e.g. every day) is   associated with tanning. It increases   eumelanin levels which gives skin a   brownish tan and provides protection   against the sun's rays.

4. How does sweating help to lower the temperature of the body?
Answer :
1.Sweating: Your sweat glands release sweat, which cools your skin as it evaporates. This helps lower your internal temperature.

2.Vasodilatation: The blood vessels under your skin get wider. This increases blood flow to your skin where it is cooler — away from your warm inner body.


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