TISSUES, ORGANS, ORGAN SYSTEMS, ORGANISM Part-2

Connective tissue

  • These tissues are specialized to connect different parts of the body.
  • The cells of connective tissue are loosely spaced and embedded in an intercellular matrix.
  • Types of Connective tissue include blood, bones, cartilages, tendons, ligaments, areolar tissues and adipose tissues.
  • Blood – Red blood cells (RBCs), white blood cells (WBCs), and platelets are suspended in the fluid (liquid) matrix known as plasma in blood.
  • Bone- It forms the framework that holds the body up. Additionally, it supports the body's major organs and anchors the muscles. It is a tissue that is rigid and robust.
  • Ligament- Two bones are connected to each other by this tissue.
  • Tendon- These are fibrous tissue with great strength and connect muscles to bones.
  • Cartilage- It smoothens bone surfaces at joints and is also present in the nose, ear, trachea and larynx. They have widely spaced cells and solid matrix composed of proteins and sugars.

  • Areolar tissues- They are located between the skin and muscles, around blood vessels and nerves and in the bone marrow. It supports internal organs, fills empty space inside the organs, and helps in tissue repair.
  • Adipose tissues- These tissue stores fat in the body and found below the skin and between internal organs.

Muscular tissue

  • They consist of elongated cells and also called muscle fibres.

  • Their main function is to provide movement to the body.
  • They are of three types- Striated muscles, Smooth muscles and Cardiac muscles.
  • Striated muscles or skeletal muscles or voluntary muscles: Cells of these muscles are cylindrical, unbranched and multinucleate. It is responsible for all the voluntary movement in our body. Since these tissues are usually attached to the bones, they are known as skeletal.

  • Smooth muscles or involuntary muscles: Cells are long, spindle-shaped and possess a single nucleus. It is responsible for all the involuntary movement in our body. It can found in the places like the alimentary canal and blood vessels.

  • Cardiac muscles or involuntary muscles: Cells are cylindrical, branched and uninucleate.These muscles make up our whole heart. These muscles exhibit regular contractions and relaxations and are involuntary in nature.

Nervous Tissue

  • Cells of this tissue are highly specialised for being stimulated and then transmitting the stimulus very rapidly from one place to another within the body.
  • Cells of this tissue are known as nerve cells or neurons.
  • These tissues are found in brain, spinal cord and nerves.
  • Neuron-It consists of a cell body, an axon and a dendrite.