Circulatory System Study Guide — Worksheet Questions (Grade 7)

Which term best matches a heart rate that is slower than normal?

• Tachycardia

• Bradycardia

• Hypotension

• Hypertension

Which word part refers to muscle?

• myo-

• endo-

• epi-

• cardio-

Which layer is the thick muscular layer responsible for contraction?

• Endocardium

• Epicardium

• Myocardium

• Pericardium

Which statement correctly describes the pericardium?

• A fluid-filled sac that encloses the heart and anchors it to the diaphragm and sternum

• The inner lining of the heart chambers that forms valves

• The muscular layer that pumps blood

• A vessel carrying blood from the heart to the lungs

Where do you find the coronary arteries, and what do they do?

• On the surface of the heart; they supply oxygen-rich blood to the heart muscle

• In the lungs; they exchange gases

• In the brain; they regulate heart rate

• Inside the heart chambers; they collect waste

What causes the "lub-dub" sound when the heart is beating?

• Opening of the valves

• Closing of the atrioventricular valves then semilunar valves

• Contraction of the atria then ventricles

• Blood flowing through the coronary arteries

The blood vessels are listed in the order they flow through the body: artery, arterioles, capillary, venules, vein. Match each vessel type to its best description.

• Small vessels that collect blood from capillaries

• Vein

• Vessels that carry blood back toward the heart, often with valves

• Artery

• Microscopic vessels where exchange of gases and nutrients occurs

• Venules

• Thick-walled vessels that carry blood away from the heart

• Capillary

• Small branches of arteries that regulate flow into capillary beds

• Arterioles

Name the largest veins, the largest artery, the artery that carries oxygen-poor blood away from the heart, and the vein that carries oxygen-rich blood toward the heart.

• Aorta

• Largest artery

• Pulmonary vein

• Artery carrying oxygen-poor blood away from the heart

• Pulmonary artery

• Largest veins

• Venae cavae

• Vein carrying oxygen-rich blood toward the heart

What are the four parts of the blood?

• Plasma

• Red blood cells

• White blood cells

• Platelets

• Lymph

Describe pulmonary circulation.

• Blood flow from the heart to the lungs and back to the heart for gas exchange

• Blood flow from the heart to the body tissues and back to the heart

• Movement of lymph through lymphatic vessels

• Blood flow through coronary arteries only