Republic of the Philippines
Department of Education
Maasin City Division
SAN RAFAEL INTEGRATED SCHOOL
San Rafael, Maasin City, Southern Leyte
Lesson Plan in Science 9
Teacher Rey L. Javier, SST - I Grade & Section 9-Aguinaldo &
Jacinto
Teaching Date July 30, 2024 Learning Area Science
Teaching Time (Monday, 10:05am -10:50am; Quarter 1st
1:00pm-1:45pm)
I. OBJECTIVES:
At the end of the lesson, students will be able to:
1. Explain how the respiratory and circulatory systems work together to transport
nutrients, gases, and other molecules to and from the different parts of the body
(S9LT-la-b-26)
1.3. Explain how the respiratory system works (S9LT-la-b-26-3)
1.4. Describe how the movement of the diaphragm helps the air go in and out of
the lungs (S9LT-la-b-26-3)
II. SUBJECT MATTER:
1. Topic : Mechanism of breathing
2. Materials : Television, Slide decks presentation, Laptop
3. References :
https://depedtambayan.net/science-9-quarter-1-living-things-module-1-respira
tory-and-circulatory-system/
https://www.pinterest.com/pin/mechanism-of-breathing-with-anatomical-proc
ess-explanation-outline-diagram--732538695650596485/
III. PROCEDURE:
A. Preparatory Activities
1. Routine Activities
● Prayer
● Short greetings and introduction
● Checking of Attendance
2. Motivation (Establishing Rapport)/Review of the previous lesson
● The teacher checks the assignment together students and gives a quick
recap of the lesson to them.
ANSWER TO THE ASSIGNMENT
1. NOSE
2. TRACHEA
3. ALVEOLI
4. BRONCHIOLES
5. PHARYNX
6. LARYNX
7. LUNGS
8. BRONCHI
9. DIAPHRAGM
B. Lesson Proper
1. Activity
● The teacher conducts an activity entitled Order Me Up!
ORDER ME UP!
INSTRUCTION: Arrange the following parts of the human respiratory system in which
the air flows in and out of the body by pasting words in the organizer displayed.
2. Analysis
● The teacher asks guide questions regarding the activity
Guide Questions:
1. How was the activity? Were you able to arrange the body parts?
2. How were you able to arrange the body parts?
3. Is there a specific order you should follow?
● The teacher introduces the learning objectives for the lesson
3. Abstract – Discussion
● The teacher introduces the topic on the mechanism of breathing
● The teacher explains the topic to the students
Breathing
Breathing is the process that delivers oxygen to where it is needed in the body and
removes carbon dioxide.
Mechanism of Breathing
Inhalation (inspiration) and exhalation (expiration) are the processes by which the
body takes in oxygen and expels carbon dioxide during breathing.
You breathe with the help of the diaphragm and the intercostal muscles between your
ribs.
The diaphragm is shaped like a parachute and located below your lungs. It divides the
chest cavity from the abdomen, while intercostal muscles are located between your
ribs.
● Breathing in (Inhalation) When you breathe in (inhale), your diaphragm contracts
(tightens) and moves downward. In this way, it could provide a bigger space for your
lungs to expand in the chest cavity. Also, the intercostal muscles help widen the area in
the chest cavity. They contract to pull your rib cage both upward and outward when
you breathe. As your lungs expand, air enters the nose and mouth, traveling towards
your windpipe and into your lungs.
● Breathing out (Exhalation) When you breathe out (exhale), your diaphragm relaxes
and moves upward into the chest cavity. The intercostal muscles also relax to decrease
the area in the chest cavity. As the space in the chest cavity reduced, carbon dioxide is
pushed out of your lungs and windpipe, and then out of your nose or mouth.
● The teacher shows a video to supplement student learning.
4. Generalization:
● The teacher asks questions about the topic being discussed
Guide:
1. What have you learned about today’s topic?
2. How does the breathing oxygen effects the entire body?
5. Application:
● The teacher conducts a formative assessment on the students.
REVIEW TIME: Write T if the statement is True, and F if otherwise False.
1. The body exhales oxygen and inhales carbon dioxide. F
2. The diaphragm relaxes as we inhale . F
3. The process of inhaling is called inspiration. T
4. Gas exchange happens outside the lungs. F
5. Diaphragm aids in our breathing mechanism. T
IV. EVALUATION:
● The teacher conducts an activity to the students
TEST YOUR KNOWLEDGE:1whole sheet of paper.
1. Using this organizer, explain how the respiratory system works by
going through the process of inhaling and exhaling air.
2. In 2 sentences, describe what happens to the diaphragm as we inhale
and exhale.
Inhale -
Exhale -
V. ASSIGNMENT:
Prepared by:
REY L. JAVIER
Special Science Teacher I
Recommending Approval: Approved:
TERESITA C. LEONOR PETRONIO A. ORDAVISA JR.
Master Teacher Principal I
