Arteries have thicker walls than veins, which have thicker walls than capillaries

Capillaries contain oxygenated blood only

Pressure in veins is always higher than it is in arteries

Arteries contain valves to prevent backflow of blood

Peripheral vasodilation

Peripheral vasoconstriction

Hyperventilation

Shivering

None of these

Arteries have thicker walls than veins, which have thicker walls than capillaries

Capillaries contain oxygenated blood only

Pressure in veins is always higher than it is in arteries

Arteries contain valves to prevent backflow of blood

Pulmonary arteries

Aorta

Pulmonary veins

Vena cavae

Pulmonary arteries

Aorta

Pulmonary veins

Vena cavae

Pulmonary veins

Pulmonary arteries

Aorta

Coronary artery

Vena cava

It is comprised of alpha and beta proteins and centers around iron

It is comprised of alpha and beta proteins and centers around copper

It is comprised only of alpha proteins and centers around iron

It is comprised only of beta proteins and centers around iron

It is comprised of alpha and beta proteins and centers around iron

It is comprised of alpha and beta proteins and centers around copper

It is comprised only of alpha proteins and centers around iron

It is comprised only of beta proteins and centers around iron

It follows the pulmonary circuit

It follows the systemic circuit

It exits the heart through the pulmonary veins, then returns through the pulmonary arteries

It travels through the right side of the heart, flows to the left side of the heart, and then enters the lungs before returning to the body

It follows the pulmonary circuit

It follows the systemic circuit

It exits the heart through the pulmonary veins, then returns through the pulmonary arteries

It travels through the right side of the heart, flows to the left side of the heart, and then enters the lungs before returning to the body