The gas exchange system of fish is:

Which one of the following statements about gills operating in water is false?

_________ filters out food grains and sand in the water that flows into the gills

Why are grains and sand filtered out of the water that flows into the gills?

Where does oxygen diffuse take place?

The efficiency of gas exchange is assisted by _________

What is the characteristic of lamellae?

The three parts of a gill:

The evolution of lamellae helped:

This structure is used to detect vibrations in the water.

Up to what percentage of the oxygen in the water can be extracted via the counter-current exchange mechanism present in fish gills?

The gills of fish utilize counter-current flow, a very effective mechanism for removing the maximum amount of_________ from the water flowing over them:

During counter-current flow fluids (water, blood) are separated by:

What fins are found near the gills and are responsible for steering and direction?

How do most sharks move water across their gills?

How do most fish move water across their gills?

The gill slits are separated by a tissue called as:

Gill arch bears_________ towards the inner (buccal) side and _________towards the outer (opercular) side:

The____________ in fish gills are organized in rows in the gill arch.

Counter-current flow promotes_________ of a substance (such as oxygen) down its concentration gradient from one fluid (water) to the other (blood):

Fish are able to facilitate gas exchange by ventilating their gill surface. This ventilation includes:

To overcome the low percentage of dissolved oxygen in water fish have two major adaptations. These include:

A hard, tooth-like projection from the gill arch that prevents large particles of food & other materials from passing into the gill lamellae:

The structure of a gill filament includes?

What is meant by a counter-current system?