Levels of Organization - Cells, tissues, Organs (Pages 68-72)

What is the most basic unit of life?

• Molecules

• Cells

• Organs

• Organ systems

Match the following numbers with their typical count in a human cell.

• Number of cells in a human body

• 30 trillion

• Number of molecules

• 42 million

• Number of bacteria in the human gut

• 10 trillion

• Number of proteins

• 30 million

How many cells are in the average human body?

• 42 million

• 42 trillion

• 30 trillion

• 10 trillion

Tissues are made of (a)  

• Molecules
• Similar cells with the same origin
• Organ systems
• Organs

Which type of tissue binds organs together?

• Epithelial tissue

• Connective tissue

• Nervous tissue

• Muscle tissue

What is the function of epithelial tissue?

• To bind organs together

• To cover exterior surfaces and line cavities

• To provide movement

• To communicate signals between the brain and body

Where is nervous tissue found?

• In the heart and liver

• In the brain, spinal cord, and nerves

• In the muscles

• In the skin

What is a key characteristic of nervous tissue?

• It is made of sheets of cells

• It is excitable and communicates signals

• It provides structure to organs

• It contracts to produce movement

What is the function of muscle tissue?

• To protect the body

• To contract and provide movement

• To connect organs together

• To form glands

An organ is (a)  

• A collection of cells performing a
• A structure made of different tissu
• A group of organ systems
• A single tissue with multiple funct