Science / Tides and Currents / Countercurrent: A current usually setting in a direc tion opposite to that of a main current. See Equatorial Countercurrent.

Equatorial Countercurrent

Science / Tides and Currents / Equatorial Countercurrent: A current setting eastward between the North and South Equatorial Currents of the Atlantic, Pacific, and Indian (in northern winter) Oceans. In the Atlantic and Pacific, its axis lies about latitude 7 MORE

Countercurrent Flow

Science / Biology / Countercurrent Flow: An arrangement by which fish obtain oxygen from the water that flows through their gills. Water flows across the respiratory surface of the gill in one direction while blood flows in the other directi MORE

Countercurrent Exchange Mechanism

Science / Marine Biology / Countercurrent Exchange Mechanism: Mechanism by which two vessels are set side by side, with fluid flowing in opposite directions, allowing efficient uptake and retention of heat, oxygen, or gas, depending upon the type of exchanger MORE

Rete Mirabile

Science / Marine Biology / Rete Mirabile: A countercurrent exchange structure of capillaries that allows gas uptake in a fish swim bladder MORE