Homework: ‘What is the Respiratory System’ packet Homework: ‘What is the Respiratory System’ packet. Current Events #17 – 20 on Friday. Do Now: 12/14/15 The Respiratory System involves a GAS EXCHANGE in the lungs. What does it mean to “exchange” something? Name the gases that are exchanged in the lungs (think about what we talked about in the circulatory system) Name the type of blood vessel that allows these gasses to diffuse in and out of it.

Throat (pharynx) Voice box (larynx) Windpipe (trachea) Bronchial tube Lung cover (pleura) Diaphragm

Why does your body need oxygen? Cell Respiration!

Respiratory System Function: GAS EXCHANGE Allows organism to obtain OXYGEN and remove CARBON DIOXIDE & WATER Think: exchanging at the mall

To begin, outside air passes through: The Pathway of Air To begin, outside air passes through: Nasal passage: lined with MUCUS and CILIA (hairs) Function: FILTERS, MOISTENS, WARMS the air What is the purpose of filtering, moistening and warming the air?

Feel your trachea, run your (bumps are rings of cartilage) The Pathway of Air Cont’d Pharynx: (throat) TRACHEA (windpipe): lined with CILIA and MUCUS, it’s supported by rings of CARTILAGE Feel your trachea, run your fingers down the front of your neck!! (bumps are rings of cartilage)

LUNGS (2): main organ of respiratory system After the TRACHEA into the: LUNGS (2): main organ of respiratory system BRONCHI (2): directs air into the lungs Branch out (get smaller and smaller) like the branches on a tree!!

At the end of the bronchi: ALVEOLI: little sacs – look like “grape-clusters” that perform GAS EXCHANGE. Gas Exchange: Oxygen in alveoli diffuses into capillaries Carbon Dioxide diffuses from capillaries into alveoli Video Clip: Gas Exchange in the Alveoli

How You Breathe At the base of your lungs is the Diaphragm

BrainPop Video The Respiratory System