Page 52 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

DRAWING DIAGRAMS - PARTS - PROCEDURE

RESPIRATORY SYSTEM Respiratory System

1. The group of organs which are participate in breathing or
external respiration is called respiratory system.
2. The parts of Respiratory System are :
1. Nostrils 2. Nosal cavity 3. internal nares 4. Pharynx 5. Glottis
Glottis 6. Larynx (voice box) 7. Trachea 8. Brochi 9. Bronchioles 10. Alveoli
3. One pair of lungs are present in chest cavity.
4. These are spongy and elastic.
5. These are surrounded by two layers called Pleura.
6. Right lung is slight larger than the left lung.
7. Each lung contains millions of small chambers called alveoli.
8. Exchange of gases between lungs and blood occurs in alveoli.
9. Oxygen (O ) enters into the blood from lungs while carbondioxide (CO ) enters
2 2
into the lungs from blood through the walls of alveoli.
MITOCHONDRIA Strucutre of MITOCHONDRIA

1. Mitochondria are small, spherical or cylindrical
How to draw
organelle are present in the cytoplasm of the cell. pl. scan QR
2. Generally a mitochondria is 2-8 micron long and about 0.5 micron wide.
3. It is surrounded by a double layered membrane.

cristae 4. Mitochondria are filled with matrix.
5. Outer membrane is smooth. Inner membrane has several folds called
Cristae.
6. Mitochondria are responsible for cellular respiration.
7. During Respiration energy produced and stored in mitochondria. So, it

is called as “Power house of the cell”.
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