Cells and Organelles
Body Systems
A Little Bit of Everything
Levels of Organization
Key Terms
100

This organelle is only found in plant cells and provides a rigid, box-like shape.

Cell wall

100

This system transports oxygen, glucose, and nutrients throughout the body.

Circulatory System

100

This system works with the skeletal system to allow movement by flexing and pulling on bones.

Muscular System

100

The smallest unit of life.

Cells

100

This type of memory is involved when you remember something for only a few seconds or minutes.

Short-term memory

200

This organelle acts as the cell's "powerhouse," converting nutrients into energy.

Mitochondria

200

Name the system that breaks down food so the body can absorb nutrients.

Digestive System

200

The respiratory system provides this molecule, which is needed to release energy from glucose.

Oxygen

200

Groups of similar cells working together to perform a specific function.

Tissue

200

This is the type of cell that does have a nucleus and organelles.

Eukaryote

300

This is the jelly-like substance inside a cell that holds organelles in place.

Cytoplasm

300

The body system responsible for controlling movement, memory, and responses to stimuli.

Nervous System

300

Cells use oxygen to release energy from this molecule, which comes from carbohydrates.

Glucose

300

In multicellular organisms, these levels follow this order: cell -> tissue -> ____ -> organ system.

Organ
300

This is the type of cell without a nucleus or organelles.

Prokaryote

400

This organelle, found in plant cells, helps produce food using sunlight.

Chloroplast

400

This system provides structure and protects organs, like the heart and lungs.

Skeletal System
400

A group of organs that work together to perform complex functions, like digestion, is called this.

Organ system

400

The type of organism made up of just one cell.

Unicellular

400

These cells sense, move muscles, and send messages to and from the brain.

Nerve cells

500

The brain of the cell, storing information and controlling cell activities.

Nucleus

500

This system allows the body to take in oxygen, which is needed for energy release in cells.

Respiratory System

500

What are the two main organs of the nervous system?

The brain and spinal cord

500

The term for an organism with many cells, which have specialized functions.

Multicellular

500

Any change in the body or outside environment: a sight, sound, smell, taste, or touch.

Stimulus

M
e
n
u