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HUMAN TISSUE

Martina Medina Schneeberger

Created on November 10, 2024

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Transcript

Martina M.

HUMAN TISSUES

A hauman tissue is a group of cells with a similar shape and structure and which specialise in carrying out the same function. Are classified into four basic types:

  • Epithelial
  • Connective
  • Muscular
  • Nevous tissue

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EPITHELIAL TISSUE

Epithelial tissue is made up of one or more layers of cells that are very close to each other.Epithelial tissue lines organs and acts as a protective barrier. There are two types:

  • Covering and lining epithelium. Serves a protective function, lining both the external and the internal surfaces of organs.
  • Glandular epithelium. Is made up of cells specialised in producing substances and screting them onto the epithelial surfaces

CONNECTIVE TISSUE

Connective tissue consists of cells surrounded by fibres and an intercellular substance called a 'matrix'.Connective tissue supports and connects organs and other tissues in the body. Types:

  • Reticular connective tissue. This tissue has an extensive gel-like matrix containing abundant fibres.
  • Adipose tissue. Has a matrix containig low levels of intercellular substance. It is found under the skin.
  • Cartilaginous tissue. Has a solid and elastic matrix.
  • Osseous (bone) tissue. The matrix is solid and hard, owing to the presence of calcium salts.
  • Blood. Has a liquid matrix called plasma,which has blood cells suspended in it.

MUSCLE TISSUE

Muscle tissue is made up of elongated cells that group together to from muscle fibres and that are able to contract and relax.There are three types:

  • Skeletal striated muscle tissue. Forms the muscles of the locomotor system and be moved voluntarily. Have severaL nuclei.
  • Cardiac striaded muscle tissue. Forms the walls of the heart. Only have one nucleus and it contracts involutarily.
  • Smooth muscle tissue. Is found int he walls of various organs. It contracts involuntarily. The cells that make it up only have one nucleus.

NERVOUS TISSUE

Nervous tissue is the main compoment of all the structures in the nervous system.It consists of neurons, which are star-shaped cells that specialise in collecting and transmitting information, and glial cells, which are responsible for neuron nutrition, defence and support.