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Phloem tissue is formed of sieve tubes, companion cells, phloem fibres, and phloem parenchyma.An ecosystem is a system formed by the interaction of the members of a biotic community with the abiotic components of their environment.A neuron consists of three main parts which are the cell body (cyton), a long cylindrical process (axon), and short processes arising from the cyton (dendrons).Organisation is the manner in which smaller units of any structure or system are arranged into larger units in a hierarchical fashion.Cartilage is found supporting the wall of the windpipe, the nasal septum, the external ear (pinna), and between the bones at joints.The main function of the apical meristem is to help plants grow in length at growing points like roots, shoots, and branches.The three main types of muscular tissues are striated (voluntary), nonstriated (involuntary), and cardiac muscles.Simple multicellular organisms like sponges represent the cellular level of organisation.Tendons are strong, nonelastic fibrous structures that connect skeletal muscles to bones, whereas ligaments are strong, elastic fibrous structures that connect two bones together at joints.Meristematic tissues consist of actively dividing, small, oval, thin-walled young cells with large central nuclei and absent or very small vacuoles.Dendrites receive nerve impulses or messages from the axons of adjacent neurons through synapses and transfer them to the cyton.A tissue is a group of structurally similar cells that perform a similar function.White blood cells are called the ‘soldiers of the body’ because they fight and kill germs that enter the body.The four levels of organization within an organism are the cellular level, tissue level, organ level, and organ-system level.Collenchyma tissue is located below the epidermis in the leaves, stem, and petioles of herbaceous dicot plants.Glandular epithelium consists of modified columnar epithelial cells that secrete digestive juices.The purpose of division of labour is to help multicellular organisms carry out different functions more efficiently and in a coordinated fashion.Lymph is filtered blood, which is straw-coloured plasma without red blood cells and blood proteins, that helps in exchange of substances and protects the body against infection.Unlike meristematic cells which keep on dividing, the cells of permanent tissues are mature and differentiated and do not divide.Xylem is also called wood because the old xylem forms the wood in trees from which furniture is made.
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Chapter: 01. Tissues
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