5th Grade-Ch. 3 Lesson 2 What is the Respiratory System

Ch. 3Lesson 2

What is the respiratory system?

Name of student

Diameter of ring

(cm)

Lung capacity (L)

Your name

Activity-pg. 80 What is your lung capacity?

Lung Capacity Activity• Question-How much air can I breathe in or

blow out?• Purpose: To determine how much air different

people can hold in their lungs• Hypothesis: If I blow a bubble as large as I

can, then the volume of air in the bubblewill be the same as the volume of airthat was in my lungs.

• Materials: black trash bag, bubble solution, plastic straw, metric ruler, masking tape

• Procedure: on pgs. 80-81 in science book

• Conclusion: I breathed out _______ of air. Compared to other students at my table, I breathed out (more or less) air.

respiratory system:• Carries gases between outside air & blood

• Many parts coated w/ mucus=

sticky, thick fluid that traps

dust, germs & other things in air

trachea• tube that carries air from larynx lungs

• leads to 2 branches (bronchi) goes in lungs

bronchioles•small tubes in lungs

larynx• vocal cords stretch across larynx

• voice= vocal cords vibrate

air sacs (alveoli)• thin walled pouches in lungs

• oxygen enters blood & carbon dioxide leaves thru. capillaries

capillary

diaphragm• dome shaped muscle that forms bottom of chest

• inhale (breathe in)- moves

• exhale (breathe out)- moves

cilia• Tiny, hairlike structures on cells in linings

of many parts of respiratory system

Scanning electron microscope image of lung cilia

nose

mouth

larynx

pharynx

trachea

lungs

bronchi

bronchioles

alveoli (air sacs)diaphragm

When you When you hold your hold your

breath, carbon breath, carbon dioxide builds dioxide builds in your blood. in your blood.

Your brain Your brain senses this & senses this &

sends a sends a message to message to

the diaphragm the diaphragm and rib and rib

muscles muscles telling them to telling them to

breathe.breathe.

Respiratory System

Are vocal cords located inside your larynx,

trachea, or esophagus?

The vocal cords are located inside your larynx.

When you inhale, which direction does

your diaphragm move?

The diaphragm pulls downward.

nose

mouth

larynx

pharynx

trachea

lungs

bronchi

bronchioles

alveoli (air sacs)

diaphragm

cilia• Tiny, hairlike structures on cells in linings

of many parts of respiratory system

trachea• Tube that carries air from larynx lungs

• Leads to 2 branches (bronchi) lungs

bronchioles

• Small tubes in lungs

exhale

breathe out

respiratory system:• Carries gases between outside air & blood

• Many parts coated w/ _________

sticky, thick fluid that traps

dust, germs & other things in air

mucus

diaphragm• dome shaped muscle that forms bottom of chest

inhale

breathe in