HIERARCHY
CELLS
TISSUES
ORGANS
ORGAN SYSTEMS
100

The word that means a ranked order of levels in the body.

What is hierarchy?

100

The smallest unit of life.

What is a cell?

100

A group of similar specialized cells that perform the same function.

What is a tissue?

100

A body structure made of different tissues that work together.

What is an organ?

100

A group of organs that work together to perform a major function in the body.

What is an organ system?

200

The level of biological organization that comes after tissues.

What are organs?

200

The type of cell that carries oxygen throughout the body.

What is a red blood cell?

200

The type of tissue that helps the body move by contracting.

What is muscle tissue?

200

Organs are made of these structures working together.

What are tissues?

200

The organ system that removes wastes from the body and includes the kidneys.

What is the excretory system?

300

The level of biological organization that comes before tissues.

What are cells?

300

The type of cell that sends signals through the body.

What is a nerve cell?

300

The type of tissue that carries electrical signals through the body.

What is nerve tissue?

300

The organ mentioned in the reading that filters blood to remove waste.

What is the kidney?

300

The organ system mentioned in the reading that includes the kidneys.

What is the excretory system?

400

The largest level of biological organization in the human body.

What is an organism?

400

Cells that have different structures so they can perform different jobs.

What are specialized cells?

400

The tissue that supports and connects body parts like bone and fat.

What is connective tissue?

400

Organs are more complex than tissues because they are made of multiple _____.

What are tissues?

400

The main job of an organ system in the body.

What is performing major body functions?

500

The correct order from smallest to largest: cells, organism, organs, organ systems, tissues.

What is cells → tissues → organs → organ systems → organism?

500

The tiny parts that make up cells according to the reading.

What are atoms and molecules?

500

The tissue that protects and covers the inside and outside surfaces of the body.

What is epithelial tissue?

500

An example of an organ in the human body.

What is the heart?
(Brain, skin, or kidney would also be correct.)

500

One example of a major organ system in the human body.

What is the digestive system?
(Respiratory, circulatory, or nervous system would also be correct.)