Chapter 42: Circulation and Gas Exchange Flashcards Preview

Bio 93: Exam 1 > Chapter 42: Circulation and Gas Exchange > Flashcards

Flashcards in Chapter 42: Circulation and Gas Exchange Deck (12)
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1

How does gas exchange happen?

By diffusion
(Passive transport)

Particles go from high pressure to low pressure

2

Gas exchange is an uptake of ____ and a release of ____.

O2 (oxygen)
CO2 (carbon dioxide)

3

What do arteries do?

Carry blood away from the heart

4

What do veins do?

Carry blood towards the heart

5

What are capillaries and what do they do?

Vessels with thin porous walls

Gas exchange

6

Lungs have sacs called _______.

Alveoli

7

What are erythrocytes?

Red blood cells

8

What do erythrocytes do?

Transport oxygen using hemoglobin

9

How many oxygen molecules (O2) does each hemoglobin protein hold?

4

10

Erythrocytes contain __________ of hemoglobin molecules

Millions

11

When an oxygen molecule is bound (attached) to hemoglobin it __________ its affinity (attraction) for oxygen.

increases

12

When an oxygen molecule is released (detached) from hemoglobin it __________ its affinity (attraction) for oxygen.

lowers