What is the main function of the pulmonary circulation?

To carry deoxygenated blood to the lungs

To supply oxygenated blood to the body

To remove waste products from the body

What is the role of the aorta in the circulatory system?

To supply oxygenated blood to the body

To carry deoxygenated blood to the lungs

What is the function of the coronary arteries?

To supply blood to the heart muscle

The events in cardiac cycle

Both atria contract, forcing blood under pressure into the ventricles.

Ventricles are bulging with blood and the increased pressure forces the atrioventricular valves shut (giving rise to the first heart sound – lubb).

Muscle in the ventricular walls begins to contract, pressure on blood inside rises and forces open the semilunar valves in the aorta and pulmonary artery.

Ventricular systole forces blood into the aorta (left side) and pulmonary artery (right side). These arteries have elastic walls and begin to expand.

As the blood leaves the ventricles, the muscle starts to relax. For a fraction of a second, blood falls backwards, catching the pockets of the semilunar valves and making them close (the second heart sound – dubb).

match the blood component with its correct function

Makes up about 55% of blood volume

Make up about 40-45% of blood volume

Make up less than 1% of blood volume

Form a platform for blood coagulation

What is the role of the pulmonary artery in the circulatory system?

To carry deoxygenated blood to the lungs

To carry oxygenated blood to the heart

What is the primary role of plasma in the blood?

To carry nutrients and hormones

What is the function of the vena cava in the circulatory system?

To carry deoxygenated blood to the heart

To carry oxygenated blood to the heart

Why are the walls of the left ventricle thicker than that of the right ventricle?

Blood from the left ventricle is pumped throughout the entire body

The left ventricle must force blood into all the capillaries of the lungs

the left ventricle doesn't skip leg day

This is false, the walls of the right ventricle are thicker

An electrocardiogram measures what?

The electrical activity of the heart.

The amount of pressure exerted on blood vessels.

How many times the heart contracts over time.

The body's temperature caused by friction of blood in vessel.

The 'Lub' sound of the heart's LUB DUB? are the....

Atrioventricular valves closing

Blood flowing through the Pulmonary Trunk and Aorta

Blood Flowing down into the ventricles

The 'Dub' sound of the heart's LUB DUB? are the....

Atrioventricular valves closing

Blood flowing through the Pulmonary Trunk and Aorta

Blood Flowing down into the ventricles

What is the definition of the Cardiac Cycle?

the sequence of events that occur during one complete heartbeat

the contraction and relaxation of the ventricles

the circulation of blood in the heart

Why are red blood cells (Erythrocytes) biconcave discs?

To increase their surface area for gas exchange

To allow them to carry more nutrients

Why is the left ventricle thicker than the right ventricle?

It pumps blood to the entire body

It receives blood from the body

It receives blood from the lungs

Why are the walls of the atria much thinner than the walls of the ventricles?

Atria pump blood to the ventricles

Atria pump blood to the entire body

List, in order, all the chambers and vessels that blood passes through on one complete passage through both sides of the heart.

Right atrium, right ventricle, pulmonary artery, left atrium, left ventricle, aorta

Left atrium, left ventricle, aorta, right atrium, right ventricle, pulmonary artery

Right ventricle, right atrium, aorta, left ventricle, left atrium, pulmonary artery

Left ventricle, left atrium, pulmonary artery, right ventricle, right atrium, aorta

What happens to a) the volume and b) the pressure in the ventricles when they contract?

Volume decreases, pressure increases

Volume increases, pressure decreases

Volume increases, pressure increases

Volume decreases, pressure decreases

Why are we said to have double circulation?

Blood passes through the heart twice in one complete cycle

Explain how a semilunar valve allows blood to flow through in one direction but not in the other direction.

It opens and closes based on pressure differences

It is controlled by nerve signals

Understanding the Cardiac Cycle and Blood

12th Grade

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Right atrium, left ventricle, right ventricle, left atrium, aorta, lungs

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What is the primary function of red blood cells in the human body?

Which component of blood is responsible for clotting?

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Which type of blood vessel carries blood away from the heart?

What is the smallest type of blood vessel in the circulatory system?

Which blood vessel has valves to prevent backflow of blood?

What is the correct order of blood flow through the heart starting from the right atrium?

What is the term for the pressure exerted by circulating blood upon the walls of blood vessels?

Which hormone is primarily responsible for regulating blood pressure?

What is the average normal blood pressure reading for a healthy adult?

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