Systems of the Human Body

When blood travels through the body, bringing important _______ to cells that need them, it doesn’t just flow anywhere and everywhere.

• pathogens

• molecules

• virus

• fungus

Blood flows through a system of organs called the _______, which takes the blood where it’s needed.

• immune system

• digestive system

• circulatory system

• mitochondria

The alveoli are surrounded by tiny blood vessels called capillaries, which have very thin walls and are so narrow that ______ have to move through them in a single–file line

• heart

• red blood cells

• white blood cells

• lungs

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-3

_____ from the air passes through your alveoli and enters your capillaries.

• carbon dioxide

• Glucose

• oxygen

• sugars

Tags

NGSS.MS-LS1-2

As red blood cells move through your capillaries, they pick up the oxygen. At the same time, _____ leaves your blood and goes through your alveoli into your lungs, where you breathe it out

• lungs

• carbon dioxide

• oxygen

• cells

In this image we can see _______.

• This diagram shows a cutaway view of the alveoli.

• An image of an animal

• An image of lungs

• An image of your mitochondrion

Your body cells need certain molecules—oxygen, glucose, and amino acids—in order to .

• repeat

• function

• not operate

• simulate

Tags

NGSS.MS-LS1-2

________ is reddish in color, which is why red blood cells (and blood) look red

• lungs

• hearts

• hemoglobin

• cells

Blood is liquid, but it is partly made up of cells—mostly red blood cells. The red blood cells transport ________ throughout the body, delivering the oxygen to all the other cells in the body.

• food

• carbon dioxide

• oxygen

• glucose

Tags

NGSS.MS-LS1-3

Your circulatory system gets its oxygen from your _______. These body systems connect inside your lungs, at the tiny air sacs called alveoli (al-VEE-oh-lie).

• circulatory system

• digestive system

• respiratory system

• immune system