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Answer 1

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(1) The cuboidal ciliated epithelium lines certain parts of the urinary tubules and keeps the urine moving in a particular direction. The columnar cilliated epithelium forms the lining of fallopian tubes and bronchioles.

✏ Functions:

• The lashing movement of cillian helps in the substances to flow in a particular direction.
• It helps in trapping the foreign unwanted substances like dust, germs and cleans the substances flowing inside it.

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(2) Tissue are the group of cells performing a specific function and have common origin. The Nervous tissue are made up of Nerve cells or Neurons. But, Tissue together forms the organs, and organs forms the organ systems. Nervous system is an organ system. It is made up of various organs like the brain, and also have the nerves, the spinal cord. Hence, Nervous system is bigger unit of the organism than the tissue i.e. Nervous tissue.

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(3) The heart is made up of cardiac muscles.( 'Cardiac' means 'heart'). They are Involuntary muscles and are able to set their own contraction rhythm. They are short, cylindrical and branched muscles. Intercalated disc are present which is unique feature of Cardiac muscles.

✏ The cardiac muscles work rapidly, rhythmically, tirelessly, and contract and relax continuously from early stage to the death stage.

In spite of Cardiac muscles, they are also made up of connective tissue, epithelial and nervous tissue through which the heart is connected with other organs.

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(4) First of all, The definition of Tissue states that they are group of cells performing a specific function in the body. This means that a cluster of cells together are not enough to term as Tissue, instead they have to perform any particular function.

✏ Egg yolk is a single cell, and we can't say that cluster of cells forms a tissue because they are not performing any function together.

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(5) On the basis of locations, structure and functions, Muscle tissue are of three types:-

• Striated muscles

✒ They are located in arms,legs, neck, diaphragm and upper part of oesophagus. They are long, narrow and cylindrical. They are multibucleated. They are mostly attached to bone, hence known as Skeletal muscles. Their movement is controlled, hence are also known as Voluntary muscles.

• Unstriated Muscles

✒ They are found in the internal organs and organs systems like our alimentary canal, urinary bladder, blood vessels, iris of the eye etc. They long, spindle shaped and don't have striations. They are not under our control, hence are Involuntary muscles.

• Cardiac muscles

✒ They are found in our heart and some regions of pulmones. They are short, branched and cylindrical. They have intercalated discs. They work without being fatigued. They are not under our control, hence Involuntary muscles.

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The different types of tissue found in our body are:-

• Epithelial tissue

✒ The epithelial tissue covers the surface of body and lines various cavities and internal organs. It serves as outer covering tissue of animal body. On the basis of the cell layers, shape and function of cells, the epithelial have further subtypes like Squamous, Columnar, Cuboidal, Ciliated and Glandular.

• Muscular tissue

✒ The tissue that comprises the muscles of our body are the muscular tissue. They are present in the form of sheath or bundles. According to their location, structure and function, they are of three types:- Striated, Unstraiated and Cardiac.

• Connective tissue

✒ They have multiple functions like they bind different parts of our body. They forms the framework of our body. They form cushions around organs. They help in transporting substances all around the body. They helps in repairing injured tissues of the body.

• Nervous tissue

✒ The nervous system is made up of nervous tissue. The nerves are found all around the body. They run to and fro to connect different parts and carry electrical impulses. They carry messages to and fro from brain or spinal cord.

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Answer 2

The cuboidal ciliated epithelium lines certain parts of the urinary tubules and keeps the urine moving in a particular direction. The columnar cilliated epithelium forms the lining of fallopian tubes and bronchioles.

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