Science 8 - Chapter 1.1-1.2-1.3
The respiratory system
and gas exchange
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Checkpoint - IGCSE - A Level program
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Objectives
01
02
03
The structure
of respiratory
system
Gas exchange
in the air sacs
Breathing in
and out
Chapter 1.1 - The human respiratory system
Why we need oxygen
Respiration is a series of chemical reactions
happening inside every living cell
The kind of respiration that usually
happens inside our cells is called aerobic
respiration -> uses oxygen.
The organs help you to take oxygen out of
the air, get rid of carbon dioxide -> the
respiratory system
Chapter 1.1 - The human respiratory system
The structure of the human
respiratory system
Chapter 1.1 - The human respiratory system
The structure of the human
respiratory system
Air sacs
Chapter 1.2 - Gas exchange
The lungs are mostly holes -> air sacs (alveoli)
Lots of very tiny blood vessels in the lung wrapped
around the air sacs -> capillaries
Chapter 1.2 - Gas exchange
The structure of an air sac
Chapter 1.2 - Gas exchange
Gas exchange
Oxygen: from the air goes
into the blood
Carbon dioxide: from the
blood goes into the air
-> Gas exchange
The air contains a lot of oxygen
and a small amount of carbon
dioxide.
Breathing
Chapter 1.3 -Breathing
Chapter 1.3 -Breathing
Questions
Homework
File chapter 1.1, 1.2, 1.3:
The respiratory system and gas exchange
QuinnyScience
Checkpoint - IGCSE - A Level program
Address: Cs1: T7 - Times City, Hà Nội
Cs2: Hoa Phượng, Vinhomes Riversides
Telephone number: 0853288017