BIOLOGICAL ORGANIZATION(RAT)

• Cells


  Smallest fundamental unit of structure and function in living organisms that is considered alive
• Types of cells


  • Prokaryotes
  • Eukaryotes
• Prokaryotes


  • Don't have membrane bound organelles
• Eukaryotes


  • Have membrane bound organelles
• Tissues


  Groups of cells that have a similar structure and act together to perform a specific function
• Types of tissue


  • Connective Tissue
  • Epithelial Tissue
  • Muscle Tissue
  • Nervous Tissue or Nervous System
• Connective Tissue


  • Provides support by binding together
• Parts of connective tissue


  • Adipose tissue (fats)
  • Cartilage (chrondocytes)
  • Bone (osteocytes)
  • Blood
  • Lymph nodes
• Blood


  • Erythrocytes (RBC or Red Blood Cells) - delivers oxygen or O2
  • Leukocytes (white blood cells) - fights foreign (bodies)
  • Plasma (liquid, it is the liquid portion of blood)
  • Platelets (thrombocytes) - blood clotting (small, colorless cell fragments in our blood that form clots and stop or prevent bleeding)
• Lymph nodes


  • Filterer of bacteria
  • Small lumps of tissues that contain white blood cells, which fights infection
  • They are part of your body's immune system
  • They filter lymph fluid
  • There are 800 lymph nodes
• Epithelial Tissue


  • Forms the covering on all external and internal surfaces on the body
• Parts of epithelial tissue


  • Skin
  • Lining of intestine
  • Villi - helps with absorbing nutrients
• Muscle Tissue


  • Composed of cells, that have the special ability to shorten or contract in order to produce movement of the body parts
• Parts of muscle tissue

  • Heart
• Types of nervous system

  • CNS (CENTRAL NERVOUS SYSTEM) - Contains: brain, spinal cord, nerves
  • PNS (Peripheral Nervous System) - Autonomic (involuntary), Somatic (voluntary)