Circulatory System and Blood Flow

Question 1

Single circulatory system

Answer 1

Blood passes through the heart once per complete circuit of the body

Question 2

Double Circulatory System

Answer 2

Blood passes through the heart twice per complete circuit of the body—once to the lungs and once to the rest of the body

Question 3

Diffusion Gradient

Answer 3

The difference in concentration of a substance between two areas, driving diffusion from a high to a low concentration.

Question 4

Surface Area: Volume Ratio

Answer 4

The ratio comparing the total surface area of an organism to its volume, affecting the efficiency of diffusion and transport.

Question 5

Deoxygenated Blood

Answer 5

Blood that has low oxygen content and high carbon dioxide levels, returning to the heart from the body

Question 6

Oxygenated Blood

Answer 6

Blood that has high oxygen content, having been oxygenated in the lungs before being pumped to the body.