Science Ch 1D

Study Guide

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

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 _____– Nose– Lungs

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

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

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 _____. – Oxygen– Carbon dioxide– Air sacs

• Now red blood cells have oxygen to deliver to _____– Body cells

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

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

Lesson 2 – How does your body use oxygen

• Capillaries are tiny _____ with thin walls through which _____, _____, and _____ pass. – Blood vessels– Oxygen– Nutrients– Waste

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

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

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.– Energy

Lesson 2 – How does your body use oxygen

• Cells use energy to _____, to _____, and to _____.– Grow– Divide– Repair damage

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

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

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

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.– Blood– 40

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

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

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

Lesson 3 – How does your body get rid of cell waste

• Water excretion helps your body keep a normal _____.– temperature