respiratory part and functions in science 8.pptx

respiratory part and functions

1. SCIENCE 9 BONNIE RICK C. PATIÑO RESPIRATORY PARTS AND FUNCTIONS

2. Review

3. Functions of the Respiratory System 1. Inhalation and Exhalation Are Pulmonary Ventilation—That’s Breathing The respiratory system aids in breathing, also called pulmonary ventilation. In pulmonary ventilation, air is inhaled through the nasal and oral cavities (the nose and mouth). It moves through the pharynx, larynx, and trachea into the lungs. Then air is exhaled, flowing back through the same pathway.

4. Functions of the Respiratory System 2. External Respiration Exchanges Gases Between the Lungs and the Bloodstream Inside the lungs, oxygen is exchanged for carbon dioxide waste through the process called external respiration. This respiratory process takes place through hundreds of millions of microscopic sacs called  alveoli . Oxygen from inhaled air diffuses from the alveoli into pulmonary capillaries surrounding them. It binds to hemoglobin molecules in red blood cells, and is pumped through the bloodstream. 

5. Functions of the Respiratory System 3. Internal Respiration Exchanges Gases Between the Bloodstream and Body Tissues The bloodstream delivers oxygen to cells and removes waste carbon dioxide through internal respiration, another key function of the respiratory system. In this respiratory process, red blood cells carry oxygen absorbed from the lungs around the body, through the vasculature.

6. Activity 1

7. Will the ball move by itself?

8. How can we make the ball move?

9. While it is moving, how can we make the ball speed up or slow down?

10. How can make it stop?

11. Activity

12. What is FORCE A force is  a Push or Pull acting upon an object as a result of its interaction with another object.

13. What are some other forces that can cause something to move? Applied Force. Gravitational Force. Normal Force. Frictional Force. Air Resistance Force. Tension Force. Spring Force.

14. How does gravity affect object on earth? On Earth, gravity pulls all objects "downward" toward the center of the planet. According to Sir Isaac Newton's Universal Law of Gravitation, the gravitational attraction between two bodies is stronger when the masses of the objects are greater and closer together.

15. What is a force that can cause an object to slow down or have little movement? Friction is what causes moving objects to slow down and eventually stop. The bigger the bumps on a surface, the greater the force, or friction, pushing in the opposite direction of an object's motion. Friction 

16. Evaluation Multiple Choice: Read each statement carefully and write only the letter of the correct answer.

17. 1. A book is at rest on top of a table. Which of the following is correct? A. There is no force acting on the book. B. The book has no inertia. C. There is no force acting on the table. D. The book is in equilibrium.

18. 2. Which of the following situations involves friction? A. A bicycle rolling down a hill B. A baseball player sliding into 2nd base C. A diver falling through the air to a pool D. All of the above experience some friction.

19. 3. What is gravity? A. Newtons first law B. The force that objects exerts on each other because of their masses C. The downward pull on the earth. D. The friction that an object has put on it.

20. 4. Which is the best example of gravity? A. A car hits a tree, and its motion stops. B. A breeze blows, and a sailboat moves C. A book is pushed, and it moves across the table D. A person drops a ball, and it falss to the ground.

21. 5. How does Earth ‘s gravity affect objects near Earth? A. It pushes them away B. It pulls them in. C. It makes them larger. D. It makes them move faster.