Simply Electrifying
The following enforces a contraction rate of 75 beats per minute as the pacemaker of the intrinsic conduction system of the heart.
What is the Sinoatrial (SA) node?
Blood leaves the left ventricle through this artery.
What is the aorta?
This part of the heart wall is composed of thin endothelium that lines the heart chambers.
What is the endocardium?
The accumulation of fatty, calcified deposits within blood vessels results in this disease.
What is coronary artery disease?
The low pressure in these vessels make it necessary for skeletal muscle activity to aid the return of blood by milking it along in these vessels toward the heart.
What are veins?
The length of the cardiac cycle is normally this many second/seconds in length.
What is 0.8 of a second?
These vessels drain capillary beds.
What are postcapillary venules?
The heart is situated in this medial section of the thoracic cavity.
What is the mediastinum?
This vessel carries oxygen-rich and nutrient-rich blood to the fetus.
What is the umbilical vein?
Microcirculation occurs in these vessels.
What are capillaries?
This system causes heart muscle to depolarize, atria first and then the ventricles.
What is the Intrinsic Conduction System (Nodal System)?
Due to the presence of plasma proteins, fluid is drawn into capillaries by this pressure.
What is Osmotic pressure?
This layer of the heart wall is synonymous with the visceral layer of the serous pericardium.
What is the epicardium?
Vessels lose elasticity as we age, as happens in arteriosclerosis. This layer of the vessel is most affected.
What is the tunica media?
These vessels have thicker walls and a heavier tunica media.
What are arteries?
A missing P wave on a patient's electrocardiogram (ECG) would lead you to believe there is a problem with this structure of the electrical system.
What is the sinoatrial (SA) node?
These vessels return oxygen-rich blood to the left atrium of the heart.
What are the Pulmonary veins?
These tiny white cords anchor the cusps of the heart valves to the walls of the ventricles.
What are the chordae tendineae?
Overworked valves that give way and cause the veins to be twisted and dilated are called this.
What are varicose veins?
These structures prevent backflow of blood in large veins.
What are valves?
This wave seen on an electrocardiogram (ECG) represents ventricular depolarization.
What is the QRS wave?
When the right ventricle contracts, this valve closes to prevent blood from flowing into the right atrium.
What is the Tricuspid valve?
The functional blood supply that oxygenates the myocardium is provided by these two arteries.
What are the right and left coronary arteries?
This flaplike opening in the interatrial septum of the fetus allows blood to be shunted directly from the right atrium to the left atrium.
What is the foramen ovale?
Blood from all body regions below the diaphragm are returned to the heart through this vessel.
What is the inferior vena cava?