Circulatory System Quiz

What is the primary function of the circulatory system?

• Digestion

• Respiration

• Transportation of nutrients and oxygen

• Nervous system regulation

In which of the following organisms is a circulatory system unnecessary due to the direct exchange of gases and nutrients through the body surface?

• Fish

• Birds

• Flatworms

• Mammals

In which group of animals can you find an open circulatory system where the blood is not always confined to vessels and directly bathes the body tissues?

• Mammals

• Insects

• Fish

• Amphibians

Unlike mammals and birds, reptiles have a three-chambered heart. Which of the following is true about this heart structure?

• It separates oxygenated and deoxygenated blood completely.

• It allows for efficient separation of oxygenated and deoxygenated blood, but there is some mixing.

• It only pumps deoxygenated blood.

• It pumps both oxygenated and deoxygenated blood together.

Which blood vessels carry oxygenated blood away from the heart to the body's tissues?

• Veins

• Arteries

• Capillaries

• Venules

In which chamber of the heart does oxygenated blood return from the lungs?

• Left atrium

• Left ventricle

• Right atrium

• Right ventricle

What is the name of the process by which white blood cells engulf and digest bacteria and foreign particles?

• Phagocytosis

• Coagulation

• Hemostasis

• Diapedesis

What is the primary pigment in the blood of arachnids and some other invertebrates that gives it a blue or green color?

• Hemoglobin

• Hemocyanin

• Hemolymph

• Hematocritin

What metal ion is at the center of each heme group in hemoglobin, which binds to oxygen?

• Iron (Fe)

• Copper (Cu)

• Zinc (Zn)

• Magnesium (Mg)

Hemoglobin can carry both oxygen and carbon dioxide. Which of the following statements is true about hemoglobin's affinity for these gases?

• Hemoglobin has higher affinity for oxygen in low pH environments.

• Hemoglobin has higher affinity for carbon dioxide in low pH environments.

• Hemoglobin has the same affinity for both oxygen and carbon dioxide in all conditions.

• Hemoglobin does not bind with carbon dioxide.