Blood vessels that bring blood back to the heart are called

The smallest blood vessels of the body where gas and nutrient exchange takes place are called

Which of the following types of blood vessels have well developed smooth muscle layer?

Which of the following types of blood vessels have valves?

The heart is a hollow muscular organ located in the middle of the chest in the space known as

The innermost layer of the heart is the

The outermost layer of the heart is

The middle, muscular layer of the heart responsible for the pumping action of the heart is

The top two smaller chambers of the heart are called

The bottom two larger chambers of the heart are called

The large veins that drains deoxygenated blood from the head, neck, shoulders and arms into the right atrium is called

The large vein that drains deoxygenated blood from the torso and legs into the right atrium is called

The blood vessel that takes deoxygenated blood from the right ventricle to the lungs is called

The four veins that bring oxygenated blood from the lungs into the left atrium are called

The largest artery of the human body that takes oxygenated blood from the left ventricle to all organ systems is called

The heart has _________ valves

Heart valves located between the atria and ventricles are called

Heart valves located between the ventricles and the blood vessels connected to them are called

Which of the following valves is located between the right atrium and the right ventricle

Which of the following valves is located between the left atrium and the left ventrcile

Which of the following valves is located between the right ventricle and the pulmonary artery?

Which of the following valves is located between the left ventricle and the aorta

The ability of individual heart muscle cells to contract independently is called

An accumulation of specialized conductive cells in the right atrium responsible for producing electrical impulses at a rate of 60-100 per minute is called

An accumulation of specialized conductive cells in the right atrium responsible for delaying the electrical impulse is called

In a healthy heart, electrical impulses that pace the heart originate in the