Wednesday March 28, 2018 Learning Target: 7.12B--Identify the main function of the respiratory system By the end of class today, I will be able to identify 2 functions of the respiratory system. Agenda: 3/28—Respiratory System 3/29—Circulatory System 4/2—Health Beat/Heart Beat Lab Science Starter: Pg. 3—Questions 1C, 2E Supplies—Workbook, pencil, agenda

Agenda 1. Rater/Tell Me Something Good 2. Turn in Worth the Wait forms 3. DCA Body Systems—April 19 4. Begin Notes on Respiratory System 5. Time Permitting Begin Notes on Circulatory System 6. Launch—Make Good Choices

Respiratory System

Functions of the Respiratory System Supply oxygen to the blood Remove carbon dioxide from the blood

What is the function of the respiratory system? To provide oxygen & carbon dioxide to the body cells. To provide carbon dioxide to body cells & remove oxygen. To provide oxygen to body cells & remove carbon dioxide. To remove oxygen & carbon dioxide from the body cells. 1 2 3 4 5

Organs of the Respiratory System Nose & Mouth (air enters through the nostrils & mouth) Nasal cavity = air is cleaned, warmed, and moistened

Organs of the Respiratory System Throat Pharynx = passageway for both food and air

Organs of the Respiratory System Throat Epiglottis = flap that closes over the larynx when swallowing to keep food & water out

Organs of the Respiratory System Throat Larynx = air only; vocal chords are attached here

Organs of the Respiratory System Throat Trachea (windpipe) = c-shaped rings of cartilage keep it open all the time

Which of these does the nasal cavity NOT do to inhaled air? Clean Warm Moisten Condense 1 2 3 4 5

What is the flap called that prevents food from entering the larynx? Pharynx Epiglottis Larynx Trachea 1 2 3 4 5

What is the first structure that only air can pass through (not food)? Mouth Pharynx Larynx Trachea 1 2 3 4 5

Organs of the Respiratory System Lungs (where oxygen & carbon dioxide are exchanged)

Organs of the Respiratory System Lungs (where oxygen & carbon dioxide are exchanged) Bronchi = 2 small branches at end of trachea; carry air into lungs

Organs of the Respiratory System Lungs (where oxygen & carbon dioxide are exchanged) Bronchioles = smaller branches off of bronchi

Organs of the Respiratory System Lungs (where oxygen & carbon dioxide are exchanged) Alveoli = tiny, grape- like sacs at the end of bronchioles; surrounded by capillaries

Organs of the Respiratory System Diaphragm (muscle below the lungs that helps move air in and out of the body)

What is this structure called? Diagram Diagonal Diaphoresis Diaphragm 1 2 3 4 5

What causes you to exhale? Your lungs contract to squeeze the air out. Your diaphragm moves up, pushing air out of the lungs. Your ribs squeeze the air out of your lungs. Your diaphragm moves down, letting air escape from your lungs. 1 2 3 4 5

Gas Exchange in the Lungs Takes place between alveoli and capillaries

Gas Exchange in the Lungs Takes place between alveoli and capillaries INHALE oxygen enter body into alveoli into capillaries into blood to body cells

Gas Exchange in the Lungs Takes place between alveoli and capillaries EXHALE leaves body into alveoli into capillaries into blood CO2 from body cells

Where does the exchange of oxygen and carbon dioxide occur? The heart The alveoli The pharynx The body cells

What carries the blood back to the heart after it picks up oxygen from the alveoli? Lungs Aorta Pulmonary artery Pulmonary vein