Question

E. Answer the following questions.
1. Why do bones have joints?
2. Why is our backbone made up of many small vertebrae instead
one straight long bone?
3. Why is bone marrow known as the factory for making blood cells?
4. How does a ball and socket joint work?
5. Dogs and bats are also mammals like us. How does our sense of smell
compare with that of a dog and our sense of hearing with that of a bat:
6. Do you breathe even when you are sleeping? Give reason for your
answer.​

Answer 1

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1 Why do bones have joints?

Ans:- Bones have joints because joint makes up two opposing surfaces that touch each other and allow movement of those two bones.

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2 Why is our backbone made up of many small vertebrae instead?

Ans:-Its because of the vertebrae that we are able to bend.If backbone will be straight and without vertebrae we will not be able to bend down as these veryebrae only help us to bent down.

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3 Why is bone marrow known as the factory for making blood cells?

Ans:- Bone marrow is know as the factory for making blood cells because in the bones there are some hollow space which made both rbc and wbc.

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4 How does a ball and socket joint work?

Ans :- Ball-and-socket joints are a special class of synovial joints that enjoy the highest freedom of motion in the body thanks to their unique structure. The shoulder and hip joints are the only ball-and-socket joints in the human body due to the need for great motion at the end of the body’s limbs and the vast amount of musculature needed to move and support such flexible joints.

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5 Dogs and bats are also mammals like us. How does our sense of smell?

Ans:-For one thing, they possess up to 300 million olfactory receptors in their noses, compared to about six million in us. And the part of a dog's brain that is devoted to analyzing smells is, proportionally speaking, 40 times greater than ours. Dogs' noses also function quite differently than our own.

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A dog interprets the world predominantly by smell, whereas human predominantly by sight. Even though a dog’s brain can be one tenth the size of a human’s brain, the part that controls smell is 40 times larger than in humans. A human has about 5 million scent glands whereas dogs have 125 million to 300 million (depending on breed), meaning their sense of smell is 1,000 to 10,000,000 times better than humans!

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6 Do you breathe even when you are sleeping? Give reason for your

answer.

Ans:-Yes it's true. because a part of brain so called medulla still remains awaken even when we are sleeping .. and controls many processes like breathing , respiration etc.

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Answer 2

The above answer is correct