Human Heart
Chordae tendinae
AV valves are connected to white cord-like structures called the ___ which are anchored to the papillary muscles of the ventricles.
Arrhythmia
Any irregular heart beat
Brachial artery of the upper arm
Artery used to measure blood pressure
120/80
Average blood pressure is given as
70-72 bpm
Average heart rate
Pulminary semilunar valve
Blood leaving the right ventricle must pass through the ______, while blood leaving the left ventricle must pass through the aortic semilunar valve.
Superior vena cavia
Blood returning from the upper body enters the right atrium through the ___ and blood from the lower part of the body must enter through the inferior veina cava these are the largest veins in the human body
Purkinje fibers
Cause the two ventricles to contract together, ejecting the blood from the heart
P wave represents
Contraction of the atria
Systolic pressure
Contraction of the heart is measured as the
QRS complex represents
Contraction of the ventricles
Sphygmomanometer
Device used to measure blood pressure is called
Open
During ventricular systole, the semilunar valves are ___, while the AV valves are closed.
Ions
EKG tracing of the heart is due to electrical impulses caused by the movement of
Duration & amplitude
EKG tracing, a cardiologist measures the ___ and ___ of each wave
Pump blood
Function of the lower chambers
Receive blood
Function of the upper chambers
Left ventricle
Hardest working chamber of the heart and possesses the thickest muscle
Myocardium
Heart muscle wall
Tachycardia
Heart rate over 100 times per minute
Bradicardia
Heart rate under 50 times per minute
Endocardium
Inner layer of the heart is composed of simple squamous epithelial tissue which makes the circulatory system a closed system
Aorta
Largest artery of the body
Dyostolic pressure
Measures the pressure of the resting heart
SA node
Natural pacemaker of the heart is the
Epicardium
Outer layer of the heart
The heart is enclosed within a double-walled sac called the
Pericardium
Pericardium
Releases fluid to lubricate the beating heart
Myogenic
The heart initiates its own beat
Thoracic cavity
The heart lies in the ____, behind the bony sternum
Four
The human heart is divided into __ chambers
Systemic circuit
The left side of the heart sends oxyginated blood to all areas of the body
T wave represents
The relaxing of the ventricles
Pulminary Circuit
The right side of the heart is this because it sends and receives deoxyginated blood
Function of the heart
Transport blood/pump throughout the body
Bundle branches
Travel within the septum of the heart along the edges of each ventricle
Ventricles
Two lower chambers
Atria
Two upper chambers
Bicuspid
Valve located between the left atria and left ventricle
Tricuspid
Valve located between the right atria and right ventricle
Deflection waves
Waves of the EKG are known as