Do fishes have a closed or open circulatory system
Do fishes have a closed or open circulatory system? Describe the number of chambers does a fish heart contain? How does blood flow all through the fish body?
Expert
Since in every vertebrate, the circulatory system of fishes is closed, that is, blood flows merely in blood vessels. The fish heart has just two consecutive chambers: a thin-walled atrium and muscular ventricle. The arterial (or oxygenated) blood comes from gills and gains arteries in the direction of tissues, then venous blood is collected by the veins and reaches atrium of the heart passing to the ventricle which pumps the venous blood in the direction of gills to be again oxygenated
Historically what were two major evolutionary theories?
Cost/benefit analysis: quality of information is what the new system ought to deliver. If this point can be availed the consultant will be able to justify the implementation of new system.
Why can allantois be thought as an adaptation to terrestrial life?
Why there is abandonment of ammoniotelic excretion takes place after the passage of animals from aquatic to terrestrial habitat?
Normal 0 false false
What are the major cytoplasmic structures that are present in animal cells?
What do you mean by Reproduction and Development. Briefly explain it.
Discuss the varying roles that organizational power, politics, and conflict play when it comes to implementing organizational change. What impact does each concept have on the ability of managers to implement change?
Describe the term melanocytes?
State if there exist any flying and aquatic mammals?
18,76,764
1951590 Asked
3,689
Active Tutors
1435459
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!