Monday December 2, 2013Monday December 2, 2013Bell workBell work

What does this mean to you ?What does this mean to you ?

Some people dream of successSome people dream of successwhile others wake every day while others wake every day

and work hard for it and work hard for it

Monday – Notes on Respiratory System

Tuesday – Notes on Respiratory System

Wednesday – Worksheet Due * Go over and practice

Thursday – Review for Test

Friday – Test on Respiratory System

Special adaptations for Special adaptations for exchange of gases (COexchange of gases (CO22 & O & O22) )

involved in aerobic respirationinvolved in aerobic respiration

Respiratory surfaceRespiratory surface– Place where environmental oxygen 1Place where environmental oxygen 1stst diffuses into diffuses into

cells cells – CharacteristicsCharacteristics

• MoistMoist• ThinThin• In contact w/ environmental source of OIn contact w/ environmental source of O22

Respiratory SystemRespiratory System

• Bring oxygen to the respiratory surface & blood

• Remove CO2 from blood and body

1. Nasal cavity –

Warms air and mucus catches dust.

1. nasal cavity –

2. pharynx – (throat)

1. nasal cavity –

2. pharynx –

3. Trachea (wind pipe) Larynx Larynx – voice box

Larynx

1. nasal cavity –

2. pharynx –

3. epiglottis

4. Trachea (wind pipe) Larynx Larynx – voice box

5. Bronchi (Bronchus)- (1st branch)

6. bronchioles (Bronchiolus)- (all the branches in the lung)

Larynx

the trachea, bronchi and bronchiole all contain

• cartilage rings cartilage rings

• MucusMucus

• CiliaCilia

Holds tubes open so air flows freely

Traps particles (dust/pathogens)

What do you think the function of each is?

Pushes mucus towards esophagus to be swallowed

AlveoliAlveoli – Human respiratory surface the place where …

Guess what the background picture is of?

Alveoli are• Air filled sacs • Surrounded by

Blood capillaries

Why is it more efficient to have thousands of little sacs (alveoli) rather the 1 or 2 big sacs for gas exchange?

CO2& O2 exchange w blood

What’s this tube?

What gas would diffuse What gas would diffuse from the alveoli into the from the alveoli into the blood?blood?

What gas would diffuse out What gas would diffuse out of the blood and into the of the blood and into the alveoli?alveoli?

Alveolus AA

BBCapillary

O2 alveoli space -> blood capillaries

CO2 blood capillaries-> alveoli space

What’s a lung?

Lung Lung – sac that contains the alveoli & brochioli & ends of the bronchi

It has the texture and feel of a

wet sponge

Answer the following questions

1. What is a respiratory surface?

2. What characteristics must a respiratory surface have?

3. What is the respiratory surface in humans?

4. What prevents the trachea from collapsing between breaths?

5. What helps prevent particles from getting into your lungs?

Tuesday December 3Tuesday December 3rdrd Bell workBell work

CLOZE ACTIVITY

• Read the passage.

• Fill in the missing words using the word bank at the top of the page.

• Please do this quietly by yourself.

BreathingBreathing

Involves the contraction and relaxation of your rib & diaphragm muscles

Inhaling Inhaling

rib muscles pull ribs out, rib muscles pull ribs out,

diaphragm contracts & moves down diaphragm contracts & moves down (this creates more space in lungs)(this creates more space in lungs)

• volume of lungs ∴ • Pressure, Air moves from high Air moves from high low P low P ∴ air moves into lungs∴ air moves into lungs

ExhalingExhaling

rib muscles & diaphragm relax rib muscles & diaphragm relax

• Lung volumeLung volume

• Lung P , air moves from Lung P , air moves from lungs to atmosphere lungs to atmosphere

What controls the rate of breathing?

Respiratory rate is regulated by

• Medulla

• Measures pH – CO2 pH

breathing &

1. Inhaled oxygen diffuses from the alveoli into ___

2. What type of blood cell carries oxygen?

3. Which way does the diaphragm move when it contracts?

4. Would you be inhaling or exhaling?

5. Emphysema & bronchitis both upset homeostasis in your body by …

6. What gas does your brain register in order to regulate breathing rate?

7. Would the diagram below represent a capillary in the alveoli or in some other body tissue? Explain.

CO2

O2

8. What is this a diagram of?

9. What type of blood vessels are B

10. Which blood vessel A/C would be highest in oxygen?

11. Lowest in carbon dioxide