Circulatory System Worksheet

Which of the following best describes a characteristic of a closed circulatory system?

• Hemolymph freely bathes the organs in the body cavity.

• Blood is confined to vessels and circulates in a continuous loop throughout the body.

• There is no heart present to pump the blood.

• Blood mixes directly with digestive fluids in the gut.

Which type of circulatory system is found in amphibians, reptiles, birds, and mammals?

• Open circulatory system

• None of the above

• Double circulatory system

• Single circulatory system

Arteries carry oxygen-rich blood away from the heart.

• False

• True

Name the largest artery and the most prominent vein in the human body.

• The largest artery is the pulmonary artery, and the most prominent vein is the superior vena cava.

• The largest artery is the aorta, and the most prominent vein is the inferior vena cava.

• The largest artery is the carotid artery, and the most prominent vein is the jugular vein.

• The largest artery is the femoral artery, and the most prominent vein is the subclavian vein.

Where is blood pressure highest and why?

• Blood pressure is highest in veins because they carry blood back to the heart.

• Blood pressure is highest in arteries near the heart due to contractions and elastic walls.

• Blood pressure is highest in capillaries due to their small size.

• Blood pressure is highest in the lungs because of oxygen exchange.

List two mechanisms that help blood return to the heart through veins despite low pressure.

• High arterial pressure and thick vein walls.

• Skeletal muscle contractions and one-way venous valves.

• Active transport and diffusion through vein walls.

• Gravity and high oxygen concentration in veins.

What is hypertension and why is it considered hazardous?

• Hypertension is a condition where the immune system attacks healthy cells. It is hazardous because it causes severe allergic reactions.

• Hypertension is a condition where the force against artery walls is consistently high. It is hazardous because it usually has no symptoms but can cause serious health issues.

• Hypertension is a condition where the bones become weak and brittle. It is hazardous because it leads to frequent fractures.

• Hypertension is a condition where the blood sugar level is consistently low. It is hazardous because it causes immediate fainting.

What are the four major heart valves, and what is their function in the cardiovascular system?

• The four major heart valves are the carotid, jugular, femoral, and subclavian valves. Their function is to regulate blood pressure in the arteries.

• The four major heart valves are the tricuspid, bicuspid, radial, and ulnar valves. Their function is to filter impurities from the blood.

• The four major heart valves are the tricuspid, pulmonary, mitral, and aortic valves. Their function is to ensure one-way blood flow through the heart by opening to allow blood to move forward and closing to prevent backflow or obstruction.

• The four major heart valves are the mitral, aortic, renal, and hepatic valves. Their function is to control the flow of blood to the organs.

What is defibrillation, and what is its primary purpose?

• Defibrillation is a surgical procedure to replace a damaged heart valve. Its primary purpose is to improve blood flow.

• Defibrillation is a medical procedure that delivers an electrical shock to stop deadly heart rhythms, such as ventricular fibrillation, and helps the heart regain a normal rhythm. Its primary purpose is to restore a normal heart rhythm.

• Defibrillation is a medication given to lower high blood pressure. Its primary purpose is to prevent strokes.

• Defibrillation is a type of physical therapy used to strengthen heart muscles. Its primary purpose is to improve exercise tolerance.

A heart attack occurs when blood flow to part of the heart is blocked, causing heart muscle cells to die due to a lack of what?

• A lack of glucose.

• A lack of oxygen.

• A lack of carbon dioxide.

• A lack of protein.