Zoology; Animal Tissues (Class12)

Animal Tissues 

Hello everyone my self Abid Ali Fakir from Marchwari-03,Rupandehi. I am a digital creater . I wrote this blog for class 12 science students (major biology). We tried our best to give every possible answers to the questions. 

If there is any mistake then please comment on comment section.

Let's begin our blog:

Very short answer questions. [1marks]

1. Name main component of matrix.

Ans: The extracellular matrix has three main components:

i.highly viscous proteoglycans (heparin sulfate, keratin sulfate and chondroitin sulfate)

ii. Insoluble collagen fibre, which provide strength and resilience 

iii. Soluble multiadhesive proteins (fibronectin and laminim)

2. Mention the functions of the lymph. 

Ans: The lymph has three main functions:

i. The removal of excess fluids from tissues.

ii. Absorption of faaty acid and subsequent transport of fats to the circulatory system.

iii. Production of immune cells such as lymphocytes, monocytes, plasma cells etc 

3. What is the plastic epithelium? 

Ans: Plastic epithelium, also known as transitional epithelium, is a type of stratified epithelium or tissue consisting of multiple layers of epithelial cells which can contract and expand as needed. They are found in the urothelium, including that of renal pelvis, urinary bladder, the ureters, urethra, prostrate and ejaculatory ducts.

4. Mention the total amount of blood in an average person.

Ans: An average adult person with a weight of 150 to 180 pounds will contain approximately 4.7 to 5.5 litres of blood circulating inside their body. Blood account roughly 7 to 8 percent of a person's body weight.

5. Which epithelium lines the blood vessel?

Ans: A single layer of squamous epithelium known as endothelium lines the blood vessels.

6. Which protein is present in white fiber?

Ans: Collagen protein is found in white fiber.

7. What do you understand by yellow spot?

Ans: Yellow spot is an oval yellow area near the centre of the retina of the human eye.

8. Write the functions of heparin and histamine.

Ans: Heparin prevents the formation of clots within the blood. During injury histamine dilates the blood vessels (i.e. vasodilator) causing the interior of the blood vessels to widen and allow white blood cells to move easily to the site of infection.

9. Why are bones brittle in old age?

Ans: Bones brittle in old age due to lack of calcium.

10. What is matrix?

Ans: Matrix is the material or ground substance in animal cells or tissue, in which specialized structures are embedded.

11. Squamous epithelium is called pavement tissue. Why?

Ans: Squamous epithelium is called pavement tissue because the squamous cells fit together like irregular pavement stones seen from above.

12. Write down the role of mast cell.

Ans: Mast cells play an important protective role as well being intimately involved in wound healing immune tolerance, defense against pathogen's blood-brain barrier function.

13. Mention the basic function of epithelial tissue.

Ans: The basic function of epithelial tissue are as follows: Protection, secretion, absorption and excretion.

14. Name the tissue whose cells divide throughout the life.

Ans: The stem cells of the blood, epithelium of skin and alimentary canal divide continuously throughout their lives.

15. Name the tissue that connect bones with bones and muscle.

Ans: Ligaments connect bones with bones and tendon connect bones with muscles.

16. What is Ligament?

Ans: A ligament is a short band of tough, flexible fibrous connective tissue,which connects two bones or cartilage or hold together a joint.

17. What is periosteum?

Ans: Periosteum is a dense layer of vascular connective tissue, composed of white collagen fibres that envelope the bones expect at the surfaces of the joints.

18. What do you understand by the term census?

Ans: A census is the procedures of systematically acquiring and recording information about the members of a given population.

19. Write the effects of increased secretion of sex corticosteroids in women.

Ans: Excess of sex corticosteroids in female develop male secondary sexual characters such as beard, moustache and hoarse voice resulting, in a disease called Adrenal virilism.

20. Define immunity.

Ans: Immunity is a balanced state of having adequate biological defenses to fight infection, disease or other unwanted biological invasion,which having adequate tolerance to avoid allergy and autoimmune diseases.

21. Mention the human body parts where you find unstriated muscles.

Ans:  Unstriated muscles are found within the walls of oesophagus, stomach, intestines, bronchi, uterus, urethra, bladder, blood vessels, arrector pilli of skin, the ciliary muscles and iris of eye.

22. What is keratoplasty?

Ans: Keratoplasty is a surgical procedure, where a damaged or diseased cornea is replaced by donated corneal tissue. It is also termed as corneal transplantation or corneal grafting.

23. What is mast cell?

Ans: Mast cells are white blood cells that are derived from haematopoietic progenitor cells. Mast cells are important immune effector and modulatory cells that help to link innate and adaptive immunity in the fight against pathogens.

24. Which cell is the longest cell of the body?

Ans: Nerve or neuron cell is the longest cell in the human body 

25. What is Osteocytes?

Ans: An Osteocyte, is a mature cell found in bone.