1. In humans, the heart is an organ that pumps blood through blood vessels. The combination of the heart and blood vessels is classified as-

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

2. Which of the following examples best represent the levels of organization from least to most complex?

• Lung cell- lung tissue- lung- respiratory system- human
• Human- lung tissue- respiratory system- lung cell- lung
• Lung cell- respiratory system- lung tissue- lung- human
• Respiratory system- lungs- body cell- lung tissue- human

3. Neurons rapidly communicate information throughout the body. Neurons combine to form tissue in the organ known as the brain. Neurons are classified as-

• cells

• tissue

• organs

• organisms

4. Which of the following correctly orders the organization in plants and animals from least to most complex?

• Organisms- organ systems- organs- tissues- cells
• Tissues- cells- organs- organisms- organ systems
• Organs- tissues- organisms- cells- organ systems
• Cells- tissues- organs- organ systems- organisms

5. A diagram of the levels of organization for the leopard frog is provided below. Which of the following terms would be the appropriate term for the level complexity LABELED X.

• Cell
• Organ
• Organisms
• Tissue

7. Which of the following provides the best evidence that the circulatory system and the respiratory system work together to carry out their function?

• Nutrients are absorbed into the blood from the intestines
• Lungs expand and contrast through movement of the diaphragm
• New red blood cells are generated in the bone marrow
• Gases exchange in the lungs are carried to the body by the blood

6. Which of the following provides an example of two human body systems working together?

• Shivering in response to sensing of cold environment
• Lungs expand and contrast through movement of the diaphragm
• Breaking down nutrients from food that has been taken in
• Exchanging oxygen and carbon dioxide with the atmosphere

8. All of the following are true of the body systems within an animal, EXCEPT-

• Each system within the body is made up of multiple parts.
• Body systems interact with other body systems at a given time.
• Parts of systems have functions only for that systems.
• Systems can respond to the needs of the animal.

9. Animals respond to threats in their environment by attacking or escaping. Either response is the result, mostly, of interactions between-

• The circulatory system and the reproductive system
• Blood circulation and hormone production
• The nervous system and the muscular system
• Respiratory rates and defense against pathogens

10. Contractions within the large intestine assist in the elimination of waste. This activity represents an interaction between -

• the digestive system and the muscular system.
• the nervous system and the muscular system.
• the digestive system and the excretory system.
• the excretory system and the muscular system.