Question

Please answer above question.

NOTE:- In true/false if anything is false please correct that statement.

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Answer 1

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1) Here are the names of Animal tissue:

• Epithelial tissue

It si the simplest issue and the protective tissue of animal body. It is a tissue that grows upon another tissue.It covers most organs and cavities within the body. It forms a barrier to keep different body systems separate. They are closely packed and due to this blood circulation is absent in epithelial tissue.

• Glandular epithelial tissue

They are tall and slender and forms the secretary cells known as Goblet cells. They are generally found in the lining of Small Intestine, glands, trachea etc. They secret mucous and other chemical substances.

• Muscular tissue

They are different from other tissues because they have unique ability to contract and relax. They are responsible for movement of body organs and locomotion of body.

• Nervous tissue

They contains the nerve cells or neurons that are responsible for the conduction of impulses. They recieve stimuli and send it to brain or spinal cord and also carries the response to the effector organ.

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2) Examples where these are located:

• Ciliated columnar epithelium

They are tall and slender cells which possess cillia. They are generally found in Nasal passages, Oviducts, Terminal bronchitis. They have protection, removal of foreign substances and movement of substances in a particular direction.

• Elastic cartilage

They are the connective tissue with abundant collagen fibres. They are strong and flexible but softer than the bone. In our body, it occurs in Ear pinna, Tip of nose, Trachea, Surrounding the joints in elbow and knee etc.

• Unstriated muscles

They are Involuntary, non striated muscles found in internal organs. They are spindle shaped and branched. They are located in Wall of internal organs like stomach, Blood vessels, Intestines, Gall bladder, Urinary Bladder, Iris of eye, etc.

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3) Specialities of given tissue:

• Cartilage

They are non porous and doesn't have blood vessels and nervous tissue. They are strong and flexible, but softer than bone. They are very elastic due to collagen fibres.

• Bone

They are rigid and have salts of calcium and phosphorus compounds which gives it high rigidity and strength.

• Striated muscles

They are voluntary and under our control. They have many nuclei located at the periphery of long cylindrical muscles. They are elongated, cylindrical and unbranched.

• Cardiac muscles

They are found in the walls of heart only. They are Involuntary and never fatigued. They have one nucleus in the centre.

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4) True/False

$\large{ \rm{ \red{i) \: True}}} \\ \\ \large{ \rm{ \red{ii) \: False}}}$

Dendrons are part of the nerve cells only. They are the sub dividing hair like structures arising from the cell body. They receive stimuli from the axon of previous cells.

$\large{ \rm{ \red{iii) \: False}}}$

The cardiac tissue is a specialised muscular tissue only found in the walls of heart. They are Involuntary. They contracts and relax tirelessly without getting fatigued.

$\large{ \rm{ \red{iv) \: False}}}$

The Epithelial tissue are closely packed and have small cementing material between them. Due to absence or less intracellular spaces, blood vessels, capillaries are unable to pierce the tissue, so blood circulation is absent there.

$\large{ \rm{ \red{v) \: True}}} \\ \\ \large{ \rm{ \red{vi) \: False}}}$

The muscles in iris of eye are Involuntary and made up of unstriated muscles. The are not under our control. The expansion and contraction of pupil due to bright and dim light is done Involuntarily by the iris muscles.

$\large{ \rm{ \red{vii) \: True}}}$

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Answer 2

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1. Name the kind of animal tissue in which

(i) Cells are flat, cuboidal or columnar, forming protective layer.

▶Epithelial tissue

(ii) Cells produce and pour out chemical substances.

▶Glandular Epithelial tissue

(iii) Cells can contract and relax.

▶Muscular tissue

(iv) Cells can conduct impulses.

▶Nervous tissue

2. Give one example of each of the following tissues where they are located.

(1) Ciliated columnar epithelium

➡Oviducts

(ii) Elastic cartilage

➡Tip of nose

(iii) Unstriated muscle.

➡Gall Bladder

3. Write one speciality each of the following:

(i) Cartilage

✒Cartilage connective tissue is important because it provides support, but is less rigid than bone. It also allows for some flexibility of movement, but has more stability than muscle. The extracellular matrix of cartilage is produced by cells called chondroblasts.

(ii) Bone

✒ It has no blood vessels or nerves. It is semi-transparent and elastic. It is a non-porous tissue.

(iii) Striated muscle

✒Striated muscles are highly organized tissues that convert chemical energy to physical work. The primary function of striated muscles is to generate force and contract in order to support respiration, locomotion, and posture (skeletal muscle) and to pump blood throughout the body (cardiac muscle).

(iv) Cardiac muscle

✒ Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscles, with the other two being skeletal and smooth muscles. It is an involuntary, striated muscle that constitutes the main tissue of the walls of the heart.

4. Mention if the following statements are true (T) or false (F)

(i) Axons of nerve cells are very long.

▶True

(ii) Dendrons bundled together form a nerve.

▶False,they are the sub dividing hair like structures arising from the cell body.So, dendrons bundled together form a nerve.

(iii) Cardiac muscles get tired soon.

▶False,they are involuntary so, contracts and relax tirelessly without getting fatigued.

(iv) Epithelial cells leave space in between.

▶False,they are closely packed and have small cementing material between them.

(v) Perikaryon is the nucleus of a nerve cell.

▶True

(vi) Muscles of the iris of the eye are of voluntary type

▶False, the muscles in iris of eye are Involuntary and made up of unstriated muscles. The are not under our control.

(vii) Cartilage has no blood vessels or the nerves in it.

▶True

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