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Monday December 2, 2013 Bell work What does this mean to you ? Some people dream of success while others wake every day 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 exchange of gases (CO2 & O2) involved in aerobic respiration Respiratory surface – Place where environmental oxygen 1st diffuses into cells – Characteristics • Moist • Thin • In contact w/ environmental source of O2 Respiratory 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) Larynx 1. nasal cavity – 2. pharynx – 3. Trachea (wind pipe) Larynx – voice box Larynx 1. 2. 3. 4. nasal cavity – pharynx – epiglottis Trachea (wind pipe) Larynx – voice box 5. Bronchi (Bronchus)(1st branch) 6. bronchioles (Bronchiolus)(all the branches in the lung) the trachea, bronchi and bronchiole all contain • cartilage rings Holds tubes open so air flows freely • Mucus Traps particles (dust/pathogens) • Cilia What do you think the function of each is? Pushes mucus towards esophagus to be swallowed Alveoli – Human respiratory surface the place where CO2& O2 exchange …w blood 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? Alveolus A Capillary B What gas would diffuse from the alveoli into the blood? O2 alveoli space -> blood capillaries What gas would diffuse out of the blood and into the alveoli? CO2 blood capillaries-> alveoli space What’s this tube? What’s a lung? Lung – sac that contains the alveoli & brochioli & ends of the bronchi It has the texture and feel of a wet sponge Tuesday December 3rd Bell work 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? 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. Breathing Involves the contraction and relaxation of your rib & diaphragm muscles Inhaling rib muscles pull ribs out, diaphragm contracts & moves down (this creates more space in lungs) • volume of lungs ∴ • Pressure, Air moves from high low P ∴ air moves into lungs Exhaling rib muscles & diaphragm relax • Lung volume • Lung P , air moves from lungs to atmosphere What controls the rate of breathing? Respiratory rate is regulated by • Medulla • Measures pH – CO2 pH breathing & 1. 2. 3. 4. Inhaled oxygen diffuses from the alveoli into ___ What type of blood cell carries oxygen? Which way does the diaphragm move when it contracts? Would you be inhaling or exhaling? 5. Emphysema & bronchitis both upset homeostasis in your body by … 6. 7. What gas does your brain register in order to regulate breathing rate? 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