G12 - 25.3 Circulation

In all of the following circulatory systems the blood remains inside blood vessels EXCEPT ...

• Open circulatory system

• Closed circulatory system

• Double-loop circulation

• Single-loop circulation

What is the primary function of capillaries in the circulatory system?

• To store blood

• To allow nutrient and oxygen diffusion

• To transport oxygen

• To pump blood

Which of the following is true about open circulatory systems?

• They are more efficient than closed systems

• Blood is contained within vessels

• Blood can come into direct contact with tissues

• They do not use pumps

What is the role of the heart in both open and closed circulatory systems?

• To move blood through vessels

• To filter blood

• To store nutrients

• To absorb oxygen

Which type of circulatory system is typically found in vertebrates?

• Single-loop circulation

• Open circulatory system

• Closed circulatory system

• None of the above

What is the main characteristic of a closed circulatory system?

• Blood is not oxygenated

• Blood remains in vessels

• Blood is pumped into open spaces

• Blood flows freely in the body

Which of the following best describes double-loop circulation?

• One loop for heart and one for body

• No loops involved

• Two loops for body and lungs

• One loop for body and one for gills

What is the primary purpose of the circulatory system?

• To digest food

• To transport nutrients and oxygen

• To produce hormones

• To regulate temperature

Which type of circulatory system is less efficient in transporting oxygen?

• Single-loop circulation

• Double-loop circulation

• Open circulatory system

• Closed circulatory system

What type of blood vessels connect arteries and veins?

• Venules

• Arterioles

• Capillaries

• Aneurysms