Lab- heart Flashcards
What is electrocardiogram
Recording of electrical signals from electrodes usually placed on the skin surface
What is auricular and atrial surfaces of the heart
The ventral surface of the heart is called the auricular surface (facing the left thoracic wall) because the tips of the two auricles (small appendages of each atrium) projects on this side along with the paraconal interventricular groove. The opposite surface (facing the right thoracic wall) is called the atrial surface which shows the subsinuosal interventricular groove
What is phrenicorepicardial ligament
Pereicardium it’s continuation to the sternum and diaphragm
Two tissue layers in pericardium
the visceral pericardium that covers the surface of the heart & the parietal pericardium covering the inner surface of the parietal sac. These two tissue layers are continuous with each other where the vessels enter or leave the heart.
What is filled with liquid in the sac
Pericardial cavity-The slender gap between the parietal & visceral surfaces
Most of myocardium is located in
in the lower two chambers of the heart called ventricles.
What is apex
the tip of the heart or the apex. Only the left ventricle extends all the way to the apex.
The turn of the aorta is called
Aortic arch
The name of the valve between right atrium and right venrticle
Tricuspid valve
How many leaflets tricuspid valve has and how leaflesta re connected to the heart
The valve consists of three leaflets & has long fibers of connective tissue called chordae tendinae that attach it to papillary muscles of the heart.
When blood flows to and from right ventricle
during diastole (period when the heart is relaxed). When the heart begins to contract (systole phase), ventricular pressure increases until it is greater than the pressure in the atrium causing the tricuspid to snap closed
Name of irregular muscular cords on the inner wall of the chamber
Trabeculae carneae
Septum is
This thick muscular wall separates the right & left pumping ventricles from each other.
What controls blood flow away from the right ventricle at the entrance to this blood vessel.
the pulmonary semilunar valve
the valve that controls blood flow between the upper left atrium and lower left ventricle.
bicuspid or mitral valve.
Where can you find a branch that feeds the heart with blood
the holes or aortic sinus in the wall of this major artery. These 2 holes lead into the coronary artery which carries blood to and nourishes the heart muscle itself
How many times the heart contracts per minute
70
Atria contract while ___
The ventricule relax
Electro cardio graph reflects ___
the depolarization progressing from sinoatrial (SA) node through atrial muscles, to atrioventricular (AV) node, bundle of His and Purkinje fibers through ventricular muscles
Different parts of ECG intervals
P wave: depolarization of atria QRS complex: depolarization of ventricles, repolarization of atria T wave: repolarisation of ventricles PR segment: AV nodal delay ST segment: ventricular contraction TP interval: diastole
The length of intervals in ECG
P-R-> 0.12-0.2 sec
Q-R-S-> under 0.1 sec
Q-t- under 0.38 sec
The blood pressure is at its highest when
When the heart beats, pumping the blood
What is the usual blood pressure
120/80
Systolic over diastolic
Pressure change during the day
It is lowest as you sleep and rises when you get up. It also can rise when you are excited, nervous, or
active
