Gas Exchange

Question 1

What are the 3 phases of gas exchange in humas?

Answer 1

1. breathing
2. transport of gases
3. exchange of gases with body cells

Question 2

What do gills do?

Answer 2

absorb O2 dissolved in water

Question 3

What is ventilation?

Answer 3

flow of water or air over the respiratory surface

Question 4

What is countercurrent exchange?

Answer 4

transfer of a substance such as oxygen between two fluids flowing in the opposite direction

Question 5

What temperature of water holds more O2?

Answer 5

cold water

Question 6

Does still or moving water hold more O2?

Answer 6

moving water holds more O2

Question 7

Does salt or fresh water hold more O2?

Answer 7

fresh water holds more O2

Question 8

What are the 2 major advantages to breathing air?

Answer 8

1. air has a higher concentration of O2 then water
2. air is lighter and easier to move then water

Question 9

What is the purpose of the diphragm?

Answer 9

-separates the abdominal cavity and the thoracic cavity
-helps ventilate the lungs

Question 10

When air is inhaled what happens to it in the nasal cavity?

Answer 10

-filtered by hairs
-warmed and humidified
-sampled for odors

Question 11

What is the process of respiration in mammals?

Answer 11

1. nasal cavity
2. pharynx
3. larynx
4. trachea
5. bronchi
6. bronchioles
7. alveoli

Question 12

What is the purpose of the secretions called surfactants?

Answer 12

prevents alveoli from sticking shut

Question 13

What type of tissue is alveoli?

Answer 13

simple squamous epithelium

Question 14

What is negative pressure breathing?

Answer 14

a system in which air is pulled into the lungs