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HSCI100 > Breath > Flashcards

Flashcards in Breath Deck (14):
1

why do we need to breathe oxygen?

by accepting e-'s from metabolism, constant ATP production

2

upper respiratory system

filters/warms/moistens air
-sinuses, nasal cavity, pharynx

3

respiratory muscles

intercostal muscles, diaphragm

4

lower respiratory systems

gas exchange
-epiglottis, larynx, lungs, trachea, bronchi(oles), alveoli

5

trachea

lined w/mucus and cilia to help keep lungs clean

6

pleura

membranes surrounding the lungs
-help keep them expanded

7

alveoli

-great surface area
-surrounded by capillaries (gas exchange)
-surfactant to keep them firm and open

8

inspiration/inhalation

active process; muscle (diaphragm/intercostal) contraction brings air into lungs
- thoracic cavity volume increases
-lungs' air pressure decreases

9

expiration/exhalation

passive process; muscles relax and expel air from lungs
- thoracic cavity volume decreases
- lungs' air pressure increases

10

medulla oblongata

breathing center in brain (autonomic)

11

chemoreceptors in the carotid/aortic bodies and medulla oblongata

respond to rising to rising CO2 blood level + increased acidity + low O2

12

exchange of gases in blood

- diffusion
- higher to lower partial pressure

13

gas exchange between lung alveoli and blood capillaries (external)

- Pco2 lung capillaries > Pco2 air (plasma -> lungs)
- Po2 lung capillaries rbc's)

14

gas exchange between capillaries and tissues

- Pco2 tissue > Pco2 blood (tissue -> blood)
- Po2 tissue tissue)