1. Science Ch 1D
Study Guide

2. Lesson 1- How does your body take in oxygen
About _____ of the air that you breathe in is a gas called _____.
1/5
oxygen
As your cells _____, they make a gas called _____. This gas leaves your body as a waste when you _____.
Work
Carbon dioxide
Breathe out

3. Lesson 1- How does your body take in oxygen
The respiratory system includes your _____, your _____, and the _____ that connect them.
Nose
Lungs
Tubes
Air enters the body through the _____, which has the job of getting the air ready for the _____

4. Lesson 1- How does your body take in oxygen
The nose’s lining makes a sticky liquid called _____ which adds _____ to the air.
Mucus
Moisture
Mucus and tiny hairs inside the nose also _____ _____ from the air.
Trap dust

5. Lesson 1- How does your body take in oxygen
Another name for the windpipe is the _____, which divides into 2 _____ _____.
Trachea
Bronchial tubes
When you breathe in, you _____.
Inhale
When you breathe out, you _____.
Exhale

6. Lesson 1- How does your body take in oxygen
Inhaled air, which is rich in _____, enters the air sacs.
Oxygen
An exchange of _____ and _____ takes place in the _____.
Carbon dioxide
Air sacs
Now red blood cells have oxygen to deliver to _____
Body cells

7. Lesson 1- How does your body take in oxygen
Carbon dioxide leaves your body when you _____.
Exhale
The large muscle below your lungs that allows you to breathe is the _____.
Diaphragm

8. Lesson 2 – How does your body use oxygen
When red blood cells are carrying oxygen, they are _____.
Bright red
After red blood cells give up their oxygen, they become dark, dull and _____.
purplish

9. Lesson 2 – How does your body use oxygen
Capillaries are tiny _____ with thin walls through which _____, _____, and _____ pass.
Blood vessels
Oxygen
Nutrients
Waste

10. Lesson 2 – How does your body use oxygen
Capillaries are so narrow that _____ have to move through them in _____ _____.
Red blood cells
Single file
Blood flows from the _____into blood vessels called _____, which carry the blood to your ____.
Capillaries
Veins
Heart

11. Lesson 2 – How does your body use oxygen
Almost all living things need _____ to stay alive as well as _____.
Oxygen
Food
Your digestive system changes food into nourishing substances called _____.
Nutrients
Like red blood cells, nutrients are carried by _____.
Plasma

12. Lesson 2 – How does your body use oxygen
Cells use _____ to break the sugar down into _____ and _____.
Oxygen
Carbon dioxide
Water
When your cells break down sugar, they release _____.
Energy
All of the _____ that your body needs is made this way.

13. Lesson 2 – How does your body use oxygen
Cells use energy to _____, to _____, and to _____.
Grow
Divide
Repair damage

14. Lesson 3 – How does your body get rid of cell waste
Your body gets rid of, or _____, cell waste.
Excretes
Your _____ does most of this work with some help from your _____ and _____.
Excretory system
Lungs
Skin

15. Lesson 3 – How does your body get rid of cell waste
Your body cells constantly produce _____.
Cell wastes
This waste moves through the thin walls of _____ and enters the _____ and is carried by the _____.
Capillaries
Blood
Plasma

16. Lesson 3 – How does your body get rid of cell waste
Carbon dioxide is _____ from the _____.
Exhaled
Lungs
Nitrogen wastes are removed by the _____, the main organ of the _____.
Kidneys
Excretory system

17. Lesson 3 – How does your body get rid of cell waste
Each kidney has about _____ tiny _____ that filter _____ from the _____.
One million
Tubes
Waste
Blood
Your kidneys clean all of your _____ about _____ times every day. 40

18. Lesson 3 – How does your body get rid of cell waste
These wastes form a liquid called _____.
Urine
It is temporarily stored in a baglike organ called the _____.
Urinary bladder

19. Lesson 3 – How does your body get rid of cell waste
The cleaned blood moves through _____ in the kidneys into _____ that carry it back to the _____ which pumps the cleaned _____ throughout the _____.
Capillaries
Veins
Heart
Blood
Body

20. Lesson 3 – How does your body get rid of cell waste
Even though your body needs water, it _____ some every day to prevent extra water from _____.
Excretes
Building up
You excrete water when you _____, in your _____, and by _____.
Exhale
Urine
Sweating

21. Lesson 3 – How does your body get rid of cell waste
Water excretion helps your body keep a normal _____.
temperature