Flashcards
Gas Exchange in Fish and Insects
Cards in this deck (7)
- 1Describe the structure of the gillsEach gill is made up of lots of thin plates called gill filaments/primary lamellae (large surface area)
The filaments are covered in gill plates/secondary lamellae (large surface area)
Each gill is supported by a gill arch
The gill plates have lots of blood capillaries and a thin layer of cells to speed up diffusion - 2What is the counter-current system?The counter-current system means that the water with a relatively high oxygen concentration always flows next to blood with a lower concentration of oxygen.
This maintains a steep concentration gradient and as much oxygen as possible diffuses from the water into the blood - 3Outline the process of ventilation in fish1. Mouth opens, buccal cavity floor is lowered
2. Volume of buccal cavity increases and pressure decreases
3. Water rushes into the mouth down a pressure gradient
4. Opercular cavity expands (contributes to decrease in pressure)
5. Mouth closes, buccal cavity floor is raised
6. Volume decreases and pressure increases (higher than in the opercular cavity)
7. Water moves from buccal cavity over the gills into opercular cavity
8. Increase in pressure forces operculum to open
9. Water rushes out of the fish through the operculum - 4What is the name for the gas exchange system in insects?Tracheal system
- 5Describe the tracheal systemAir moves into the tracheae through spiracles. The trachea branch off into tracheoles which have thin, permeable walls and go to individual cells. The tracheoles also contain fluid which oxygen dissolves in; the oxygen then diffuses from this fluid into the cells. CO₂ diffuses in the opposite direction.
- 6Complete the sentences: Insects uses rhythmic ____________ movements to change the ________ of their bodies and move air in and out of the ___________. Larger insects use their _______ movements to pump their ___________ too.Insects uses rhythmic ABDOMINAL movements to change the VOLUME of their bodies and move air in and out of the SPIRACLES. Larger insects use their WING movements to pump their THORAXES too.
- 7Insects usually have hairs around the spiracles. Why?Hairs around spiracles trap humid air
They minimise bulk air movement around the spiracle, and thus minimise water loss
Information
- Description
- User has deleted their subject information Flashcards on Gas Exchange in Fish and Insects, created by Deleted user on 05/03/2018.
- Created by
- Deleted user · Mar 2018
- Updated
- Mar 5, 2018
- Views
- 28
- History
-
- Created by Yinka F · Jan 31, 2018
- Copied by Yinka F · Mar 5, 2018
- Rating