The job of the circulatory system is to circulate, or constantly move, blood around the body. Blood carries oxygen and nutrients to cells. It also collects cellular waste like carbon dioxide so that it can be removed from the body. The circulatory system is composed of the heart, arteries, veins, capillaries and the blood transported by these tissues. Arteries, veins and capillaries are types of blood vessels. Arteries are usually represented in red on a diagram of the circulatory system because they carry oxygen-rich blood. Veins are usually represented in blue because they carry oxygen-poor blood. Capillaries are the smallest blood vessels. They are thinner than a strand of hair. If you straightened out all the blood vessels in the body, the circulatory system’s network would be 60,000 miles long. Which of these is true of blood?

Blood brings oxygen and nutrients to cells.

Blood is transported through veins only.

Blood collects capillaries from cells around the body

The main organ of the circulatory system is the heart. The heart is a fist-sized muscle a little to the left of the center of the chest. Every day, it beats about 100,000 times, pumping about 2,000 gallons of blood. The heart has four chambers: the right atrium, right ventricle, left atrium and left ventricle. Each chamber is separated by a valve. These valves work like one-way doors that keep blood flowing in the right direction. The valves open to let blood flow through, then quickly close to prevent it from flowing backward. Based on the passage, which of these is most likely true?

Blood circulates through the body in one direction.

The heart has eight separate chambers.

The human body contains about 2,000 gallons of blood.

At its core, circulation is how blood gains and loses oxygen as it moves through the body. Veins carry oxygen-poor blood from the body to the right side of the heart. The heart pumps this blood through the pulmonary arteries into the lungs. The blood picks up oxygen in the lungs and moves into the left side of the heart. The heart pumps the oxygen-rich blood through the aorta, the body’s main artery. The blood moves through arteries and capillaries to deliver oxygen and nutrients to cells all over the body. Then the newly oxygen-poor blood is carried through the veins to the right side of the heart, and the cycle of circulation begins again. Which of these is a difference between veins and arteries?

Veins flow toward the heart, and arteries flow away from the heart.

Arteries flow toward the heart, and veins flow away from the heart.

Circulatory System Quiz

Authored by Jonathan Pauley

Science

8th Grade

NGSS covered

Used 4+ times

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MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Which organ is responsible for pumping oxygenated and deoxygenated blood throughout the body?

Lungs

Heart

Stomach

Small Intestine

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

______ is the tendency of an organism to maintain balance, a constant and stable internal environment.

Pulmonarisis

Photosynthesis

Homeostasis

Which level of organization encompasses the others?

Cells

Tissues

Organs

Organ Systems

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

the movement of blood throughout the body.

Circulation

Tissues

Homeostasis

Organ Systems

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

The circulatory system is responsible for all of the following EXCEPT:

Transporting nutrients throughout the body to cells that require it

Circulating metabolic waste such as carbon dioxide away from cells that no longer need it

Excreting waste from the body

Working with the respiratory system to circulate oxygen and carbon dioxide throughout the organism

Which of these is true?

Veins carry oxygen-poor blood, and arteries carry oxygen-rich blood.

Veins carry oxygen-rich blood, and arteries carry oxygen-poor blood.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

The main organ of the circulatory system is the

Liver

Lungs

Heart

Head

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Circulatory System Quiz

Which organ is responsible for pumping oxygenated and deoxygenated blood throughout the body?

______ is the tendency of an organism to maintain balance, a constant and stable internal environment.

Which level of organization encompasses the others?

the movement of blood throughout the body.

The circulatory system is responsible for all of the following EXCEPT:

Which of these is true?

The main organ of the circulatory system is the

The heart is about the size of a

a type of blood vessel that carries oxygen-poor blood from the body toward the heart.

a type of blood vessel that carries oxygen-rich blood from the heart to the rest of the body.

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