Blood Cells
How many types of blood cells are there?
Three
What is the most important organ in the circulatory system?
The heart
The air sacs inside of the lungs are called ______.
Alveoli
Oxygen enters the body in two ways: what are they?
Through the nose or the mouth
Name an animal that does not have lungs
Any fish or marine invertebrate
Which blood cells carry oxygen throughout the body?
Red blood cells
The smallest blood vessels are called _______.
Capillaries
The air sacs inside of the lungs are surrounded by _____________.
Capillaries
Another name for the windpipe is the __________.
Trachea
Name two things that can help your circulatory system stay healthy
Which blood cells help fight disease?
White blood cells
Arteries move blood ________ the heart.
Away from
There are approximately ____________ tiny air sacs inside of the lungs.
600,000,000
The role of the bronchi is to connect the lungs to the _________.
Trachea
The trachea connects to the lungs and is part of the respiratory system. The esophagus connects to the stomach and is part of the digestive system.
Which blood cells clot to stop bleeding?
Platelets
Veins move blood ________ the heart.
Toward
How does oxygen travel from the lungs to the rest of the body?
It is transported through the capillaries to other blood vessels by red blood cells (must include red blood cells in answer)
What is the name of the dome-shaped muscle that helps move the lungs?
The diaphragm
Animals that do not have lungs use _______ to breathe.
Gills
Where are blood cells formed?
In the bone marrow
The major blood vessel leading into the heart is called the ______.
Aorta
The tubes that travel from the bronchi to the tiny air sacs inside of the lungs are called ________.
Bronchioles
Where does the respiratory system's name come from?
From the word "respire", which means to breathe
The process by which tadpoles turn to frogs is called __________.
Metamorphasis