8.1 :Gas exchange in Unicellular organisms Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

what are the 4 essential features of a respiratory surface

A

For the rapid diffusion of gasses a resp[iratory surface mus

  1. Have a large surface area to volume ratio
  2. Be thin the so that the diffusion pathways are short
  3. Be permeable so that the gasses diffuse easier
  4. Have a mechanism to produce a steep diffusion gradient accross the respiratory surface, by bringing oxygen or removing carbon dioxide rapidly
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what do the features of a single celled (unicellular) organism allow it to do?

A

single celled organisms are able to…

  • absorb enough oxygen across the cell membrane to meet their needs for respiration.
  • remove carbon dioxide fast enough to prevent building up a high concentration making the cytoplasm too acid for enzymes to function.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the features of a unicellular organism

A

A single cell organism such as an Amoeba is very small (100 micrometres) and…

  • Has a large surface area to volume ratio.
  • is thin to allow diffusion into the cell rapidly.
  • and also to ensure diffusion distances inside the cell is short.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

where does the diffusion of gasses occur

A

On a respiratory surface

eg.

Alveoli inside the lungs

Trachea of an insect

Spongy mesophil of a plant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly