Biology
Study the figures given below and answer the following questions :
(i) Identify the kind of tissues shown as A, B and C.
(ii) Write one specific location of each in the human body.
(iii) Mention one common function of all.
(iv) Write one structural difference between the tissues A and B.
(v) Which of these two tissues are not under the control of our will ?
Answer
(i) The tissues shown in figures A, B, and C are:
A → Striated muscles
B → Unstriated muscles
C → Cardiac muscles
(ii) One specific location of each in the human body:
- Striated muscles are found in face.
- Unstriated muscles are found in the iris of the eyes.
- Cardiac muscles are found only in the walls of the heart.
(iii) All the muscle types can contract and relax. Thus, they help the body in all its movements and locomotion.
(iv) One structural difference between the tissues A and B:
| Striated muscles | Unstriated muscles |
|---|---|
| Striated muscles are skeletal, and stripped. They are attached to the bones. | Unstriated muscles are smooth, and unstripped. |
(v) Unstriated muscles are not under the control of our will.
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Leesha fell from her bicycle and fractured one bone in her forearm. The X-ray confirmed a crack, so the doctor placed her arm in a plaster cast to keep the bone steady until it healed. While explaining the treatment, the doctor told her that bones are strong because of certain minerals stored in them.
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