Gas exchange (WORK)

0.0(0)
studied byStudied by 0 people
GameKnowt Play
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/14

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

15 Terms

1
New cards

What is gas exchange

Exchange of CO2 and O2 at cells and tissues through diffusion

2
New cards

List 5 adaptations of gas exchange surfaces

  • Large surface area

  • Thin tissue layer (1 cell thick)

  • Permeable membranes

    Dense network of capillaries with constant blood flow surrounding to maintain concentration gradient for diffusing gases

  • Covered in layer of moisture: allows gas to dissolve and diffuse rapidly

3
New cards

Respiration

Release of ATP energy from organic compounds in cells.

4
New cards

What is partial pressure? What factors affect it

Pressure exerted by single gas when its found in mixture of gasses

  • Total pressure exerted by all gas in the mixture

  • Concentration of target gas

5
New cards

Low partial pressure of O2

Low haemoglobin affinity to O2

6
New cards

High partial pressure of O2

High haemoglobin affinity to O2

7
New cards

O2 dissociation curve (x and y axis, Shape description)

Shows affinity of haemoglobin for oxygen

  • X axis = partial pressure

  • Y axis = O2 saturation of haemoglobin

Sigmoid shape

  • Start at low PP low saturation.

  • PP increase, saturation increase

  • High PP, curve flattens out because most haemoglobin are fully saturated

8
New cards

What is the max amount of O2 that can bind with 1 Haemoglobin

4

9
New cards

What happens to affinity for O2 when more O2 binds to 1 haemaglobin

Conformational change in shape of haemoglobin occurs

Increases affinity o

10
New cards
11
New cards

What is co-operative binding

When binding of one molecule to another facilitates the binding of another to the same molecule

12
New cards

O2 Partial pressure in the lungs

HIgh partial pressure. Haemoglobin becomes fully saturated

13
New cards

O2 Partial pressure in respiring tissue

Respiring tissue uses O2, low concentration of O2, and low Partial pressure of O2

Haemoglobin release O2, diffuse into respiring tissue to provide more O2.

14
New cards

CO2 modes of transport (3)

  1. Some CO2 is bounded in haemaglobin

  2. Small amount of CO2 dissolved in blood plasma

  3. Most CO2 is reversibly converted to HCO2 + ion in blood cells

15
New cards

Difference between Foetal and Adult Haemoglobin

Foetal: 2 alpha 2 gamma haemoglobin parts

Adult: 2 alpha 2 beta

Explore top notes

Explore top flashcards