Tissues -3

8. Differentiate between striated, unstriated and cardiac muscles.

 

Characters	Striated	Unstriated	Cardiac
1. Location	In the limbs, tongue, pharynx, beginning of oeshophagus.	In wall of visceral organs, in hair muscles.	Form the myocardium of the heart.
2. Structure	In the limbs, tongue, pharynx, beginning of oeshophagus.	In wall of visceral organs, in hair muscles.	Form the myocardium of the heart.
3. Arrangement	In bundles.	Act as sheets in visceral organs.	Form continous network in the body.
4. Size	Long, with blunt ends.	Short, with pointed ends.	Short, with flat ends.
5. Shape	Cyllindrical.	Spindle-shaped.	Cyllindrical.
6. Sarcolemma	Surface membrane.	Plasma membrane.	Plasma membrane.
7. Nucleus	Multinucleate.	Uninucleate.	Uninucleate.
8. Myofibrils	Dark and light bands are present.	No bands are present.	Bands are present.
9. Mitochondria	Numerous.	Less in numbour.	Very numerous.
10. Branching	Unbranched.	Unbranched.	Branched.
11. Mode of contraction	Contract rapidly for short period as soon as they get fatigued.	Contract slowly for long period and do not get fatigued.	Contract rapidly, rhythmically and do not get fatigued.
12. Intercalacted Disc	Absent.	Absent.	Present.

 

10. Name the following:
(a) Tissue that forms inner lining of our mouth. Squamous epithelium
(b) Tissue that connects muscle to bone in humans. Tendon
(c) Tissue that transports food in plants. Phloem
(d) Tissue that stores fart in our body. Adipose tissue
(e) Connective tissue whose matrix is fluid. Blood
(f) Tissue present in the brain. Nervous tissue

11. Identify the type of tissue in the following:
(i) Skin: Squamous epithelium
(ii) Bark of Tree: Cork
(iii) Bone: Connective tissue
(iv) Lining of Kidney Tubule: Cuboidal epithelium
(v) Vascular Bundle: Conductive tissue.

12. Name the regions in which parenchyma tissue is present.
Parenchyma is present in the cortex in stem, the mesophyll in leaf and also as aerenchyma in aquatic plants.

13. What is the role of epidermis in plants?
The role of epidermis in plants is:
(i) It plays a protective role as it protects all the plant parts.
(ii) It forms the entire covering of a plant.
(iii) It posses stomata for gaseous exchange and transpiration.

14. How does cork act as a protective tissue?
The cells of cork are dead and are compactly arranged. They have no intercellular spaces. They posess a deposition of suberin on the walls and it makes impervious to gases as well as the water. Cork forms later without leaving the intercellular spaces. The cork protects from the excessive water loss and affects the environent thus.