From Cells to Body Systems

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From Cells to Body Systems

• Human Biology 11

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Understanding Cells

• Cells are the building blocks of life
• There are trillions of cells in the human body
• Our body cells are specialized, which means that
  each type of cell has a different function
• Each cell contains organelles which allow the
  cell to work properly
• If the organelles do not work properly, the cell
  will die

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Cells Build Tissues

• Tissues are groups of specialized cells that work
  together to perform a certain task
• There are 4 different types of tissues that are
  found in the human body
• Epithelial
• Connective
• Nerve
• Muscle

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Epithelial Tissue

• This tissue forms a film-like covering
• Its purpose is to cover the surfaces of many
  different organs in the body

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Connective Tissue

• This is the most common type of tissue
• This separates and supports other cells and
  tissues
• It can also act as a site of attachment for cells
  and other tissues
• Collagen is the main protein in connective tissue

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Nerve Tissue

• This tissue is responsible for sending messages
  to the brain and throughout the entire body

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Muscle Tissue

• This tissue is able to contract and expand
• Its purpose is to allow movement

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Tissues Build Organs

• Organs are groups of specialized tissues that
  perform certain tasks
• Each body organ has a specific shape and is made
  up of different types of tissues to perform a
  certain job
• The heart, as an example, is mostly muscle tissue
  WHY?
• The heart also contains nerve tissue and is
  covered in epithelial tissue (pericardium)

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Organs in the Human Body
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Organs Build Systems

• Body systems are groups of specialized organs
  that perform a specific function
• Some organs belong to more than one particular
  body system

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Organization of the Human Body
CELLS
TISSUES
ORGANS
BODY SYSTEMS