Which of the following describes the main differences between fish and human circulation of blood throughout the body? Select the TWO answers that apply.

Question

Quizplus · Accepted Answer

A) The primary difference in the circulatory systems of fish and humans is the structure of the heart. Fish have a two-chambered heart, consisting of one atrium and one ventricle, which pumps blood in a single circuit through the body, including passing through the gills for oxygenation. In contrast, humans have a four-chambered heart, with two atria and two ventricles, supporting a double circulatory system. This system separates the pulmonary circulation (lungs) from the systemic circulation (rest of the body), allowing for more efficient oxygenation of blood and distribution throughout the body.C) In fish, the blood pressure does indeed drop as blood passes through the capillary beds of the gills for oxygenation. This is a significant difference from human circulation, where the lungs oxygenate blood without a substantial drop in blood pressure, thanks to the heart's separate pulmonary and systemic circuits. The single circulatory system of fish means that the oxygenated blood must be pumped back through the body by the same heart, which initially received it deoxygenated, leading to a challenge in maintaining blood pressure as it circulates through the body.

Which of the Following Describes the Main Differences Between Fish