Body Systems and Hierarchical Organization Assessment

The diagram shows how the brain and skin respond when blood is too hot or too cold. Which action helps cool the body when it is too hot?

• Blood vessels narrow and sweat is stopped

• Blood vessels widen and no sweat is released

• Blood vessels widen and sweat is released

• Blood vessels narrow and sweat is released

Skeletal muscles need energy to contract and relax. Which body systems work together to deliver that energy to muscles?

• Digestive, excretory, integumentary

• Digestive, circulatory, respiratory

• Circulatory, nervous, excretory

• Respiratory, integumentary, nervous

The diagram shows levels of organization in plants. Which option represents the cellular level?

• Single plant cell with organelles

• Whole plant organism

• Group of similar plant cells

• Leaf from a plant

Refer to the diagram showing four labeled parts (1–4). Which labeled part best represents the level of organization that is composed of multiple organs working together as a system?

• part 1, showing tissue layers and cells

• part 3, showing the digestive tract organs

• part 4, showing one stomach organ

• part 2, showing a single muscle tissue