Animal Circulation L 25.3

What is the main function of the circulatory system?

• Transporting gases and nutrients

• Producing hormones

• Regulating body temperature

• Digesting food

Which animals have an open circulatory system?

• Arthropods and most mollusks

• Humans

• Reptiles

• Birds

What is the main difference between open and closed circulatory systems?

• The presence of blood vessels

• The way blood travels through the body; whether it is moving freely or just contained inside blood vessels

• The type of blood cells

• The number of hearts

Which type of circulation system do most vertebrates with gills have?

• No-loop circulation

• Triple-loop circulation

• Double-loop circulation

• Single-loop circulation

What is the purpose of capillaries in the circulatory system?

• To pump blood to the lungs

• To exchange nutrients and oxygen with body tissues

• To store excess blood

• To regulate blood pressure

What happens in the lungs during double-loop circulation?

• Blood is filtered by the kidneys

• Blood is stored for later use

• Blood picks up oxygen and drops off carbon dioxide

• Blood is pumped to the heart

What is the purpose of the ventricle in the heart?

• To receive blood from the body

• To separate oxygen-rich and oxygen-poor blood

• To pump blood into the body parts

• To regulate heart rate

Which animals have a four-chambered heart?

• Mammals

• Reptiles

• Amphibians

• Fish

What is the main difference between amphibian and reptilian hearts?

• The number of chambers

• The color of the blood

• The presence of partitions in the ventricle

• The size of the atrium

During chordate evolution, what happened to the original two chambers of the heart?

• They combined into one chamber

• They separated into four chambers

• They remained the same

• They disappeared completely