Blood vessels 1
Which vessels drain tissues and return blood to the heart?
Veins
How many chambers make up the human heart?
4 Chambers
Where do veins drain the head and upper extremities empty into?
Superior vena cava
Where do the semilunar valves lie?
Between ventricles and the large arteries that leave the ventricles on each side of the heart
What does the T wave of the ECG represent?
Repolarization of the ventricles
What is the largest artery in the body?
Aorta
What is the purpose of the right tricuspid valve?
It prevents backflow of blood from the right ventricle into the right atrium
Which vessel carries blood rich in nutrients and oxygen to a developing fetus in the womb?
Umbilical vein
What are the major pumping chambers of the heart?
What is the QRS complex associated with?
Depolarization of the ventricles
Which vessels drain the liver?
Hepatic veins
Which structure anchors the right and left atrioventricular valves?
Papillary muscles
Where does gas exchange take place?
Between tissue cells and blood through capillary walls
Which side of the heart receives blood from the body and pumps it to the lungs?
The right side
Which wave signals the depolarization of the atria immediately before they contract?
P wave
Longest vein in the body, located in lower limbs
The great saphenous vein
The heart is located in a subdivision of the thorax called the ____________
Mediastinum
What drains the digestive viscera and carries dissolved nutrients to the liver for processing?
Hepatic portal circulation
What portion of the pericardium covers the heart wall?
Visceral layer (epicardium)
During which portion of the elctrocardiogram do the atrioventricular valves close? (First heart sound "Lub")
R-S waves
Which vessel is terminated with the anterior tibial artery and is often palpated in patients with circulatory problems to determine the circulatory efficiency of the lower limb?
Dorsalis pedis
What do heart valves do?
They enforce a one-way blood flow through the heart
They separate atria from ventricles and ventricles from the large arteries that leave them
Which artery is the largest branch of the abdominal aorta and supplies most of the small intestine and half of the large intestine?
Superior mesenteric artery
What is the outer layer of the two-layered structure that is the pericardial sac that encloses the heart?
The fibrous pericardium
What is the middle and largest deflection wave in a normal ECG?
QRS complex