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Skeleton system full solved chapter with pdf

     Our Skeleton with pdf



Ques /ans- 



    One word ques




Ques-1. How many bones are there in an adult body?

Ans- 206 bones.


Ques-2. How many pairs of ribs are present in the rib cage?

Ans- 12 pairs.


Ques-3. which of the system in the human body gives shape and support to the body?

Ans- skeleton


Ques-4. ___ joints are found in the skull and pelvis.

Ans- immovable.


Ques-5. Write the other name of involuntary muscles.

Ans- smooth muscles.


Ques-6. _____ gridle consists of a shoulder blade and a collar bone.

Ans- Pectroral.


Ques-7. Name the fatty substances that forms blood in our Skeleton.

Ans-. Bone marrow.


                            Very short Q/A


Ques-1. How many bones are present in our facial region.

Ans- There are 14 bones present in our facial reason.


Ques-2. Which muscles are found in the walls of our heart?

Ans- cardiac muscles are found in the wall of our heart.


Ques-3. Which of the girdles are attached to the  hind limbs?

Ans- pelvic griddles are attached to the hind limbs.


Ques-4.  What is rib cage?

Ans-  Ribs make a cage around our chest, this cage is of bone is called rib cage.



Ques-5. Name all the bones are present in our forelimbs and hindlimbs.

Ans-   

Forelimbs (arms)

Hindlimbs(legs)

Humerus

Femur

Radius

Tibia

Ulna

Fibula




Short ques/ans




Ques-1. Define skeleton. What are the different parts of our Skeleton system?

Ans- Our bones are connected together to form a framework called skeleton.

Parts of Skeleton system are:-

i) The skull

ii) The backbone

iii) The rib cage

iv) limbs

v) girdle


Ques-2. Explain hinge joint and pivot joint.

Ans- Hinge joint -  This joint is like the hinge in a door. It allows movement of bones in one direction only.

Example- knee, elbow and fingers.


Pivot joint - This joint is found between the skull and first two vertebrae of the backbone. It allows movement of the head in the sideway, upward and downward.



Ques-3. Define brainbox. 

Ans- In our skull, the eight flat bones interlocked together enclose and protect the delicate brain inside it. It is called brainbox.



Ques-4. What are the functions of the skeleton system?

Ans- Functions of the skeleton system are as follow:-

  1. It provides shape to our body.

  2. It provides support and strength to our body.

  3. It provides protection to the delicate internal organs like heart,lungs and brain.

  4. It helps in the movement of our body with the help of muscles.



Long Ques/Ans



Ques-1. Differentiate between voluntary muscles and involuntary muscles.

Ans-

Voluntary muscles

Involuntary muscles

The muscles which are under our control are called voluntary muscles

these muscles are not under our control. they work without our thinking.

These muscles are also called skeleton muscles

These muscles are also called smooth muscles

Ex: biceps and triceps

Ex:- our heart, lungs and stomach.



Ques- 2. How do muscles work?

Ans- muscles are made up of tough elastic tissues and work by pulling the bones. The muscles work in pairs to provide movement to the bones when a muscles contracts, the other one relaxs.

For example:- when you pull your lower arm up, biceps contract and triceps relax. when you straighten your arms, the triceps contract and biceps relaxs. when a muscle relaxs, it returns to its original size.


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