respiratory system

Question 1

Nostrils

Answer 1

Air flows in/out during inhalation/exhalation.

Question 2

Nasal cavity

Answer 2

Warms and moistens air.
Hairs filter out unwanted particles.

Question 3

Pharynx

Answer 3

The throat.

Question 4

larynx

Answer 4

The voice box.
Air flows through, producing sound.

Question 5

Trachea

Answer 5

Cartilage tube that carries air to the lungs.

Question 6

Lung

Answer 6

Left lung is made of two lobes and has an indentation for the heart.
Right lung is made of three lobes and is bigger than the left.

Question 7

Bronchi

Answer 7

The trachea breaks into two bronchi, each one supplying a lung.

Question 8

Bronchioles

Answer 8

Smaller branches of each bronchi.

Question 9

Alveoli

Answer 9

Microscopic sacs, one cell thick.
Site of gas exchange.

Question 10

diaphragm

Answer 10

Flat, sheet like muscle.
Contracts during inspiration and relaxes during expiration

Question 11

inspiration

Answer 11

The diaphragm contracts and lung volume expands causing air from the surroundings to flow into the lungs.

Question 12

expiration

Answer 12

The diaphragm relaxes and lung volume decreases causing air from the lungs to flow out to the surroundings.

Question 13

Gas exchange

Answer 13

After inspiration the alveoli are rich in oxygen. This oxygen needs to diffuse into the blood so that cellular respiration can occur.

Question 14

Gas exchange

Answer 14

After cellular respiration the blood is rich in carbon dioxide. This carbon dioxide needs to diffuse out of the blood and into the alveoli so it can be exhaled out of the body.

Question 15

Gas exchange

Answer 15

The alveoli are only one cell thick and are surrounded by capillaries (blood vessels).
This allows gases to easily move from one to the other.