Question

what are simple tissues? Explain their three different types.

Answer 1

meristematic (embryonic and totipotent)

simple (composed of only one type of cell), such as. parenchyma. collenchyma. sclerenchyma.

complex (composed of more than one type of cell), such as. dermal (protective covering) vascular (conducting tissue) xylem (conducts water and dissolved minerals)


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Answer 2

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Here is your answer........

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In biology, tissue is a cellular organizational level between cells and a complete organ. A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.

Connective tissue

Connective tissues are fibrous tissues. They are made up of cells separated by non-living material, which is called an extracellular matrix. This matrix can be liquid or rigid. For example, blood contains plasma as its matrix and bone's matrix is rigid. Connective tissue gives shape to organs and holds them in place. Blood, bone, tendon, ligament, adipose and areolar tissues are examples of connective tissues. One method of classifying connective tissues is to divide them into three types: fibrous connective tissue, skeletal connective tissue, and fluid connective tissue.

Muscular tissue

Muscle cells form the active contractile tissue of the body known as muscle tissue or muscular tissue. Muscle tissue functions to produce forceand cause motion, either locomotion or movement within internal organs. Muscle tissue is separated into three distinct categories: visceral or smooth muscle, found in the inner linings of organs; skeletal muscle, typically attached to bones, which generate gross movement; and cardiac muscle, found in the heart where it contracts to pump blood throughout an organism.

Nervous tissue

Cells comprising the central nervous system and peripheral nervous system are classified as nervous (or neural) tissue. In the central nervous system, neural tissues form the brain and spinal cord. In the peripheral nervous system, neural tissues forms the cranial nerves and spinal nerves, inclusive of the motor neurons.

Epithelial tissue

The epithelial tissues are formed by cells that cover the organ surfaces such as the surface of skin, the airways, the reproductive tract, and the inner lining of the digestive tract. The cells comprising an epithelial layer are linked via semi-permeable, tight junctions; hence, this tissue provides a barrier between the external environment and the organ it covers. In addition to this protective function, epithelial tissue may also be specialized to function in secretion, excretion and absorption. Epithelial tissue helps to protect organs from microorganisms, injury, and fluid loss.

Functions of epithelial tissue:

The cells of the body's surface form the outer layer of skin.

Inside the body, epithelial cells form the lining of the mouth and alimentary canal and protect these organs.

Epithelial tissues help in absorption of water and nutrients.

Epithelial tissues help in elimination of waste.

Epithelial tissues secrete enzymes and/or hormones in the form of glands.

some epithelial tissue perform secretory functions. they secrete a variety of substance such as sweat,saliva(mucus),enzymes,etc.

There are many kinds of epithelium, and nomenclature is somewhat variable. Most classification schemes combine a description of the cell-shape in the upper layer of the epithelium with a word denoting the number of layers: either simple (one layer of cells) or stratified (multiple layers of cells). However, other cellular features, such as cilia may also be described in the classification system. Some common kinds of epithelium are listed below:

Simple squamous epithelium

Stratified squamous epithelium

Simple cuboidal epithelium

Transitional epithelium

Pseudostratified columnar epithelium (also known as Ciliated columnar epithelium)

Columnar epithelium

Glandular epithelium

Ciliated columnar epithelium

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