Other forms of connective tissue also contain trace amounts of reticular fibres. The word “reticular connective tissue” refers to the fibres that make up the majority of the tissue structure. In the dense connective tissue, fibroblast cells and fibres are compactly packed. They form the subcutaneous layer under the skin along with adipose tissues, attaching muscles and other structures to the skin.
Types of Connective Tissue
Most of the cartilage is replaced by bones in adults, however, it supports some structures in adults too. Examples of dense regular tissue are tendons and ligaments. The collagen fibres are present between the parallel running bundles of fibres. Their main function is to support and transmit mechanical forces. It supports the internal framework of organs such as liver, lymph nodes and spleen.
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Except for phloem fibres, other phloem cells are living cells. Phloem fibres possess narrow lumen and they are thick-walled elongated spindle-shaped dead cells. The muscular tissue which functions throughout the life continuously without fatigue is Areolar tissue fills the space inside the organs and supports internal organs and helps in the repair of tissue. Cells in these tissues are filled with fat globules. Renal tubules and corpuscles in the kidney are formed by Cuboidal epithelium tissue.
(d) Epithelial cells with cilia are found in———of our body (d) Movement of chocolate in your intestine- is a function of involuntary muscles (c) Writing with hand- is a function of voluntary muscles (b) Pumping of the heart- is a function of involuntary muscles
(a) The nature of matrix differs according to the function of the tissue Cork cells are made impervious to water and gases by the presence of They are usually loosely arranged, thus large spaces between cells (intercellular spaces) are found in this tissue. The tissue that helps in the sideways conduction of water in the branches is In desert plants, the rate of water loss gets reduced due to the presence of
Meristematic tissues are dividing tissue. Answer is (c) Apical and intercalary meristems are permanent tissues (c) Apical and intercalary meristems are permanent tissues (b) Collenchymatous tissues are irregularly thickened at corners
It acts as a shock absorber and helps in maintaining body temperature in colder environments. They are found between many organs as a filling and act as a shock absorber and reservoir for salt and fluid. They are spindle-shaped and present between collagen fibres. Reticulate fibres consist of collagen and glycoproteins. Elastic fibres form a network and can be stretched like a rubber band. Collagen fibres are flexible and have high tensile strength (comparable to steel).
Functions
- When the immune system of the body starts attacking healthy tissues, it is known as an autoimmune disorder.
- Which structure protects the plant body against the invasion of parasites?
- (e) Epithelial layer does not allow regulation of materials between body and external environment.
- Which of the following tissues has dead cells?
They are somewhat less flexible than loose connective tissue. They wander through connective tissues, clean up debris and remove bacteria and other antigens by phagocytosis. They join connective tissues to neighbouring tissues. Connective tissues, as the name implies, support and connect different tissues and organs of the body. There are mainly four different types of tissues present in our body. The combination of these components gives a delicate consistency to the loose connective tissue making it flexible and not very resistant to stress.
Important topics of NCERT Exemplar for Class 9 Science Chapter 6 Tissues
This type of tissue is present in the dermis of the skin. White adipose tissues protect kidneys and are also found at the back of the eye, in the hump of camels, blubber of whales, etc. A group of cells along with intercellular substances that perform a specific function is called tissue. (c) Parenchyma and collenchyma are two simple permanent tissues, whereas xylem and phloem are two complex permanent tissues. The basic differences between meristematic and permanent tissues of plants are tabulated below
Outer protective tissue of the plant undergoes changes with age. D) Junction of vegas casino app the tree branch composed of collenchyma cells which provide rigidity and flexibility to the branches. C) In pear fruit sclerenchyma cells are called stone cells. (a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole. This is the glandular epithelium. This columnar epithelial facilitates movement across the epithelial barrier.
It consists of relatively unspecialised cells with thin cell walls. Parenchyma is the most common simple permanent tissue. This minimizes the effect of heat and reduces the loss of water. (d) Sieve tube cells They have two functions, storage and lateral food conduction.
(e) ———gives flexibility in plants. (c) Cells of cork contain a chemical called——— (d) Husk of coconut is made of ———tissue. (b) ———have guard cells. Fill in the blanks (a) ———are forms of complex tissue. Epidermal tissue forms a continuous layer which helps to avoid mechanical stress.
- Answer is (b) Columnar epithelium
- Fill in the blanks (a) ———are forms of complex tissue.
- It has thick cuticle and dermal tissue which help in preventing the attack from parasites.
- Epithelial cells with cilia are found in respiratory tract of our body
- In desert plants, the rate of water loss gets reduced due to the presence of
Where is the reticular connective tissue found?
The fibres and cells are loosely arranged in the semi-fluid matrix. Fibroblasts are found in developing tissues and play an important part in wound-healing. Fibroblasts or adipose cells are stationary and macrophages, mast cells, monocytes, lymphocytes are migrating cells. They secrete different types of fibres and matrices.
Answer is (c) localised and dividing cells (c) localised and dividing cells Which muscles act involuntarily? This will help bones to move and they do not pull the ligament as that will cause a sprain or stretch.
Short Answer Questions
Thus, they form permanent tissue. Phloem is also made of four different types of elements Live plant cells that are short, lignified and generally thin-walled.
What are the functions of the areolar connective tissue?
The water conducting tissue generally present in gymnosperm is Epithelial tissues do not have intercellular spaces between them rather they are tightly bound together to make a continuous sheet. Answer is (c) Epithelial tissues have intercellular spaces between them (c) Epithelial tissues have intercellular spaces between them (b) Fats are stored below the skin and in between the internal organs
It is the commonest type of connective tissue in the human body and it is found in most organs of the body and in other tissues. Loose connective tissues are further classified into areolar, adipose and reticular tissue. There are various kinds of cells present in different types of connective tissues. The function and types of connective tissues depend on the nature of the intercellular substance present. Among the cells, the fibroblasts are the predominant cells; other types of connective tissue cells are also present, along with nerves and blood vessels. Neurons do not contain tendons as they are connective tissues that join skeletal muscles to bones.
Parenchyma cells are located in the soft parts of the plants such as pith and cortex. Living tissues with thin cell wall with central vacuole and dense cytoplasm. Yes, small amounts of adipocytes are present in the areolar tissue. The brown adipose tissue is found in newborn organisms where it serves the purpose of generating heat or thermogenesis. If you find a random arrangement of tissue under the microscope with spaces, it is most likely the areolar tissue you are viewing. It contains the random distribution of much ground substance, little collagen, and a variety of cells together with blood vessels that are numerous.
