Human Heart

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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


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