1. Control & Coordination Part 1 The Respiratory System
Year 9 Science 2013
Control & Coordination
Part 1 The Respiratory System

2. Gas Exchange
Oxygen and carbon dioxide need to be exchanged with the environment for ___________and _____________

3. Diffusion
The process of gas exchange is always by _____________between the external and internal environment of the organism.

4. Surface Area: Volume
For single-celled and small organisms this is not a problem because of their high ___________to __________ratio.

5. Multicellular Organisms
Large organisms rely on specialised __________surfaces.

6. Features of Respiratory Surfaces
Large____________
______, _______and easily penetrable surface.
Adequate____________
Efficient transport of carrier fluid_________) across respiratory surface.

7. Mammalian Respiratory System
Is composed of:
Lungs
Respiratory passages
___________
____________
_____________

8. Alveoli The site of________________
Increases the surface area for gas exchange.

9. Breathing
Contraction & relaxation of the __________muscle results in changes in pressure within the lung cavity, forcing air in & out.

10. Epiglottis
The ___________prevents food from travelling down the trachea and blocking the passage of air.

11. Gas exchange relies on diffusion, therefore ______________gradients need to be maintained.

12. For oxygen to continually diffuse into capillaries around alveoli, oxygen needs to be transported ___________from the site

13. Respiratory pigments such as ___________carry oxygen in the blood from lungs and release oxygen into cells.

14. Rhythmic pumping of the __________ensures continuous flow of blood along capillaries surrounding the alveoli.

15. Haemoglobin and _____________bind in a reversible reaction.