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Gas Exchange not just in the lungs. Gas exchange starts in the lungs......but it happens everywhere! The heart and blood vessels make up the cardiovascular.

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Presentation on theme: "Gas Exchange not just in the lungs. Gas exchange starts in the lungs......but it happens everywhere! The heart and blood vessels make up the cardiovascular."— Presentation transcript:

1 Gas Exchange not just in the lungs

2 Gas exchange starts in the lungs......but it happens everywhere! The heart and blood vessels make up the cardiovascular system, which takes oxygen nearly everywhere in the body.

3 Inspiration (inhale) ●lungs fill with air ●air moves through bronchi into alveoli ●oxygen moves down concentration gradient into the blood stream

4 Concentration Gradient Review There are differences in “concentration” within and between cells- different numbers of molecules in a given space. Molecules will try to distribute themselves evenly, even on different sides of membranes. It takes energy to move a molecule against its concentration gradient!

5 Circulation ●Oxygen binds with hemoglobin, which is located in red blood cells (RBCs) ●Now we’ll trace an RBC through circulation ●From the lungs, the RBC moves through the pulmonary veins to the heart O2 is blue, bound in center of hemoglobin molecule

6 Sending oxygen to the hand Our RBC exits the left ventricle, travels up the aorta, through the brachial (latin for ‘arm’) artery, and on to the hand.

7 Hand muscles need O 2 to operate

8 Blood vessels permeate muscle tissue ●The RBC reaches the tiniest blood vessels, known as capillaries ●Concentration gradients are now the opposite of what they were in the lungs- lots of CO 2 in the tissue and O 2 in the blood stream ●Both move down their concentration gradients

9 CO 2 crosses membranes CO 2 delivered to RBCs CO 2 delivered to lungs for expiration From cells in organ tissue to capillaries, CO 2 moves down its concentration gradient and enters RBCs. capillary in skeletal muscle

10 Our RBC now carries CO 2 - “deoxygenated” ●The RBC travels back through veins towards the heart ●Once back in the heart, the heart pumps it back to the lungs

11 Expiration (Exhaling) CO 2 moves down its concentration gradient, into the alveoli of the lungs. O 2 is moving from alveoli into the bloodstream. We’re back at the start!

12 Questions?


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