Question

E. Answer the following questions.
3
1. Why do bones have joints?
2. Why is our backbone made up of many small vertebrae instead of having
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

Resposta:

1. Why do bones have joints?

Otherwise we wouldn't have flexibility in our limbs.

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

one straight long bone?

Because the vertebrae are responsible for the flexibility of our back.

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

Because it produces the platelets and white blood cells.

4. How does a ball and socket joint work?

Taking a knee as example, it is a synovial joint, its function is to allow flexion and extension of the leg in relation to the thigh.

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?

The human being has the same senses, but in a less developed way. The sense of smell in dogs, and the sense of hearing in bats are much more accurate than in humans.

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

answer.

The breathing is a involuntary muscular movement, as the heartbeat, so it happens despite our willing, although the breathing as the blinking of the eyes can be "controled" while we are awaken.