Life:Simple and Complex

Hrishikesh .S. ThopteSTD: IX A

Roll no:58

CONCEPT MAP

Unicellular MulticellularOR

Plants AnimalsLike

No Differentiation of organs and tissues

Plants Animals

Organs

Root, stem, leaf Different body parts

Tissues

In Plants In Animals

Meristematic plant Tissue Permanent Tissue Simple Animal Tissue Complex Animal Tissue

Living Beings

Tissues and Organ systemsCells group together in the body to

form tissues - a collection of similar cells that group together to perform a specialized function.  There are 4 primary tissue types in the human body: epithelial tissue, connective tissue, muscle tissue and nerve tissue.

Epithelial Tissue

The cells of epithelial tissue pack tightly together and form continuous sheets that serve as linings in different parts of the body.  Epithelial tissue serve as membranes lining organs and helping to keep the body's organs separate, in place and protected.  Some examples of epithelial tissue are the outer layer of the skin, the inside of the mouth and stomach, and the tissue surrounding the body's organs.

Connective TissueThere are many types of connective tissue in the body. Generally speaking, connective tissue adds support and structure to the body. Most types of connective tissue contain fibrous strands of the protein collagen that add strength to connective tissue. Some examples of connective tissue include the inner layers of skin, tendons, ligaments, cartilage, bone and fat tissue. In addition to these more recognizable forms of connective tissue, blood is also considered a form of connective tissue.

Muscle Tissue

Muscle tissue is a specialized tissue that can contract. Muscle tissue contains the specialized proteins actin and myosin that slide past one another and allow movement. Examples of muscle tissue are contained in the muscles throughout your body.

Nervous TissueNerve tissue contains two types of cells: neurons and glial cells. Nerve tissue has the ability to generate and conduct electrical signals in the body. These electrical messages are managed by nerve tissue in the brain and transmitted down the spinal cord to the body.

Organs

Organs are the next level of organization in the body.  An organ is a structure that contains at least two different types of tissue functioning together for a common purpose.  There are many different organs in the body: the liver, kidneys, heart, even your skin is an organ.  In fact, the skin is the largest organ in the human body and provides us with an excellent example for explanation purposes.  The skin is composed of three layers: the epidermis, dermis and subcutaneous layer. 

Liver a type of organ

Animal Tissues

Animal tissues can be grouped into four basic types: connective, muscle,nervous, and epithelial. Multiple tissue types comprise organs and body structures. While all animals can generally be considered to contain the four tissue types, the manifestation of these tissues can differ depending on the type of organism. For example, the origin of the cells comprising a particular tissue type may differ developmentally for different classifications of animals.

Plant TissueExamples of tissue in other multicellular organisms are vascular tissuein plants, such as xylem and phloem. Plant tissues are categorized broadly into three tissue systems: the epidermis, the ground tissue, and the vascular tissue. Together they are often referred to as biomass.

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