Circulatory system

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

• Carry blood away from the heart

• Exchange nutrients and oxygen with tissues

• Carry blood back to the heart

• Prevent blood from flowing backwards

Which type of blood vessel has walls that are only one cell thick?

• None of the above

• Capillaries

• Arteries

• Veins

What is the main role of capillaries in the circulatory system?

• To control the flow of blood

• To carry blood under high pressure

• To exchange substances with cells

• To carry blood back to the heart

Why do arteries need to have thick walls?

• To handle low blood pressure

• To allow easy diffusion of substances

• To handle high blood pressure

• To store blood

What is the function of valves in the veins?

• To increase blood pressure

• To prevent blood from flowing backwards

• To exchange gases

• To expand and recoil

How do veins differ from arteries in terms of wall thickness?

• Veins have thicker walls than arteries

• Veins have the same wall thickness as arteries

• Veins have thinner walls than arteries

• All blood vessels have the same wall thickness

What allows capillaries to effectively exchange nutrients and waste with cells?

• Their valves

• Their permeability and thin walls

• Their thick muscle layer

• Their large size

Why is the blood flow slower in capillaries compared to arteries?

• Because of their thicker walls

• Because of their higher pressure

• Because of their smaller lumen

• Because of their larger total cross-sectional area

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

• To exchange nutrients and oxygen

• To carry blood under high pressure

• To carry blood back to the heart

• To pump blood

How do you calculate the rate of blood flow through the aorta?

• Add the volume of blood to the time

• Divide the volume of blood by the time

• Subtract the time from the volume of blood

• Multiply the volume of blood by the time