Respiratory
Skeletal
Cardiovascular
Nervous
100

Main organs of the respiratory system

Lungs

100

Main organ of the skeletal system

Bones

100

Main organ of the cardiovascular system

The heart
100

Main organ of the nervous system

The brain

200

What is another name for the trachea?

The windpipe

200

Places where two or more bones meet

Joints

200
Largest artery in the body

Aorta

200

Basic building block of the nervous system that transmits information

Neuron

300
What is another name for the voicebox?

Larynx

300

Number of bones in the adult skeleton

206

300
Protein in red blood cells

Hemoglobin

300

Small gaps between neurons

Synaspse

400
What is the large muscle at the bottom of the chest that powers breathing?

Diaphragm

400

What is the strongest bone in the body?

Femur

400

The upper chamber of the heart

Atria
400

The largest part of the brain that is responsible for thinking, memory, and voluntary movement

Cerebrum

500
What are the tiny hairs in your nose and trachea called?

Cilla

500

Main minerals stored by bones that make them strong

Calcium and Phosphorus

500

Widening of blood vessels

Vasodilation

500

Process where neurons take on different, specialized functions

Differentiation

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