Cells, Tissues, Organs and Organ systems

• What are the different levels of organization within a multicellular organism like a human?

  Organelles, cells, tissues, organs, organ systems, and organisms
• What are organelles also called?

  Subcellular structures
• What is the role of organelles in a cell?

  Each organelle has a specific role to play
• Name three examples of organelles.

  Nucleus, ribosomes, and mitochondria
• What do we call different types of cells that have specialized functions?

  Specialized cells
• Give examples of specialized cells.

  Epithelial cells, muscle cells, and glandular cells
• How can tissues be described?

  A group of similar cells that work together to carry out a particular function
• What type of tissue is formed by lots of epithelial cells?

  Epithelial tissue
• What is the function of epithelial tissue?


  To cover the body's surfaces
• What type of tissue is formed by muscle cells?

  Muscle tissue
• What is the primary function of muscle tissue?

  To contract and relax to move different parts of the body
• What type of tissue is formed by glandular cells?

  Glandular tissue
• What is the role of glandular tissue?


  To make and secrete chemicals like enzymes and hormones
• How is an organ defined?

  A group of different tissues that work together to perform a particular function
• What types of tissues might work together to form an organ like the stomach?

  Epithelial tissue, muscular tissue, and glandular tissue
• What is the function of the stomach as an organ?

  To kill microorganisms and break down proteins
• What is an organ system?

  A group of organs that work together to perform a particular function
• Which organs form the digestive system?

  The stomach, pancreas, and liver, along with other organs
• What is the role of the digestive system?

  To digest food and absorb nutrients
• Name two other organ systems besides the digestive system.

  The cardiovascular system and the reproductive system
• What is the highest level of organization in a multicellular organism?

  The whole organism
• How many different organ systems are there in the human body?

  About 12 different organ systems
• Name three examples of organs in the human body.

  Skin, lungs, and liver
• What are the levels of organization in a multicellular organism?

  • Organelles
  • Cells
  • Tissues
  • Organs
  • Organ systems
  • Organism
• What are the functions of the different types of tissues?

  • Epithelial tissue: Covers body surfaces
  • Muscle tissue: Contracts and relaxes to move body parts
  • Glandular tissue: Makes and secretes chemicals like enzymes and hormones
• What are some examples of organ systems in the human body?

  • Digestive system
  • Cardiovascular system
  • Reproductive system
  • Immune system
  • Nervous system
  • Respiratory system
  • Endocrine system
  • Urinary system