Animal Tissues
ANIMAL TISSUES
1. Classify the animal tissues.
On the basis of the function they perform, animal tissues are classified into four different types. They are:
i) Epithelial tissue
ii) Connective tissue
iii) Muscular tissue
iv) Nervous tissue
2. What are epithelial tissues? What are the characteristic features of these tissues?
The covering or protective tissues in the animal body are called epithelial tissues. They also perform the functions of secretion and absorption other than protection.
Characteristics:
i) It is the simplest tissue made up of a single layer of cells, compactly arranged without any intercellular spaces.
ii) It forms a protective covering and lines most of the organs and cavities within the body.
iii) They form a barrier to keep the different body systems separate
iv) All epithelial tissues are separated from the underlying connective tissues by an extracellular fibrous basement membrane.
v) Blood vessels are absent in epithelial tissues.
3. What are the functions of epithelial tissues?
Epithelial tissues perform the following functions:
i) Protection: they protect the underlying tissues from drying, injury, infections and from harmful chemicals. Epithelium also produces exoskeletal structures like hair, nails, hoofs, horns, scales etc
ii) Absorption: they form the lining of the intestine and absorb digested food and nutrients and water.
iii) Excretion: they form the lining of kidney tubules and help in the elimination of nitrogenous waste products.
iv) Secretion: epithelial lining of digestive glands and endocrine glands secrete useful enzymes for digestion and other biological processes in our body.
v) Respiration: epithelial cells lining the blood vessels and the alveoli in lungs allow the diffusion of gases between blood and inhaled air.
4. Describe the different types of epithelial tissues.
Based on the shape and function of the
1. Classify the animal tissues.
On the basis of the function they perform, animal tissues are classified into four different types. They are:
i) Epithelial tissue
ii) Connective tissue
iii) Muscular tissue
iv) Nervous tissue
2. What are epithelial tissues? What are the characteristic features of these tissues?
The covering or protective tissues in the animal body are called epithelial tissues. They also perform the functions of secretion and absorption other than protection.
Characteristics:
i) It is the simplest tissue made up of a single layer of cells, compactly arranged without any intercellular spaces.
ii) It forms a protective covering and lines most of the organs and cavities within the body.
iii) They form a barrier to keep the different body systems separate
iv) All epithelial tissues are separated from the underlying connective tissues by an extracellular fibrous basement membrane.
v) Blood vessels are absent in epithelial tissues.
3. What are the functions of epithelial tissues?
Epithelial tissues perform the following functions:
i) Protection: they protect the underlying tissues from drying, injury, infections and from harmful chemicals. Epithelium also produces exoskeletal structures like hair, nails, hoofs, horns, scales etc
ii) Absorption: they form the lining of the intestine and absorb digested food and nutrients and water.
iii) Excretion: they form the lining of kidney tubules and help in the elimination of nitrogenous waste products.
iv) Secretion: epithelial lining of digestive glands and endocrine glands secrete useful enzymes for digestion and other biological processes in our body.
v) Respiration: epithelial cells lining the blood vessels and the alveoli in lungs allow the diffusion of gases between blood and inhaled air.
4. Describe the different types of epithelial tissues.
Based on the shape and function of the