TUTORIAL Chapter 3: Circulatory System

Which of the following animals has a single circulatory system?

• Mammals

• Birds

• Amphibians

• Fish

In a double circulatory system, blood passes through the heart how many times during one complete circuit of the body?

• Once

• Twice

• Three times

• Four times

Which of the following is a characteristic of an open circulatory system?

• Blood is confined within vessels at all times.

• Blood is pumped into open spaces called sinuses.

• It requires a high-pressure system for blood flow.

• It is found in mammals.

What is the main advantage of a double circulatory system in mammals?

• Higher blood pressure in systemic circulation

• Efficient nutrient exchange

• Decreased energy demand

• Less oxygen in the blood

Which type of blood vessel carries blood away from the heart?

• Veins

• Arteries

• Capillaries

• Lymphatic vessels

What is the function of capillaries in the circulatory system?

• Transport oxygenated blood to the heart

• Allow exchange of gases, nutrients, and waste between blood and tissues

• Pump blood into veins

• Store blood for emergencies

Which of the following vessels has valves to prevent backflow of blood?

• Arteries

• Capillaries

• Veins

• Arterioles

Which blood vessel has the thickest walls to withstand high pressure?

• Artery

• Vein

• Capillary

• Venule

Hemoglobin binds oxygen in the lungs to form which compound?

• Carbaminohemoglobin

• Deoxyhemoglobin

• Oxyhemoglobin

• Hemoglobinase

What part of the hemoglobin molecule binds to oxygen?

• Globin protein

• Iron in the heme group

• Carbonic acid

• Phosphate group