Body organization

Which example below is the most complex part of a multicellular organism?

• A. respiratory system
• B. red blood cell
• C. large intestine
• D. connective tissue

The brain, spinal cord, and nerves are all organs that work together to send messages throughout the body. This is an example of ____.

•  an organ system
• an organ
• a cell
• an organelle

The brain is composed, or made of, many different types of cells and tissue. What level of organization is the brain?

• A. organ system
• B. organ
• C. cell
• D. tissue

A group of cells works together to connect and support various parts of the body. This group of cells can be called a _____.

• an organ
• an organism
• a system
• a tissue

The respiratory system includes the lungs. What level of body organization are the lungs?

• A. tissue
• B. organ
• C. cell
• D. organ system

The most basic level of human organization is _____.

• an organism
• an organ
• a cell
  
• a tissue

A group of related tissues that work together to perform a function make up ____.

• a system
• an organism
•  an organ
• a cell