Which part of the circulatory system is responsible for pumping blood throughout a mammal's body?

• Heart
• Lungs
• Kidney
• Liver

In fish, what is the main function of the gills in the circulatory system?

• To pump blood
• To exchange gases
• To digest food
• To filter waste

What type of blood vessel carries oxygen-rich blood away from the heart in mammals?

• Veins
• Arteries
• Capillaries
• Nerves

How many chambers does a typical reptile heart have?

• Two
• Three
• Four
• Five

What is the primary function of red blood cells in vertebrates?

• To fight infections
• To transport oxygen
• To clot blood
• To produce hormones

Which of these animals typically has a four-chambered heart?

• Fish
• Amphibians
• Birds
• Insects

Why is the amphibian circulatory system considered to be 'double loop'?

• Because it circulates blood in two directions
• Because it has two heart chambers
• Because it has two separate blood vessels
• Because it involves two distinct loops for circulation

In mammals, which side of the heart handles oxygen-poor blood?

• Right
• Left
• Top
• Bottom

Which layer of the heart is responsible for its muscular contraction?

• Endocardium
• Myocardium
• Pericardium
• Epicardium

Fish has ( ) chambers in single circulation. What is ( )?

• 2

Mammals circulation is the most efficient compared to the other vertebrates.