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Chapter 18 Quiz
Heart
20
Anatomy
Undergraduate 4
02/08/2012

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Term
Coronary Sinus
Definition
An enlarged vessel composed of a combination of cardiac veins and arteries that empties blood into the right atrium.
Term
Foramen Ovale
Definition
-oval door
-connects the two atria and allows blood entering the right heart to bypass the pulmonary circuit and the collapsed, nonfunctional fetal lungs
Term
Ductus Arteriosus
Definition
-exists between the pulmonary trunk and the aorta
-these shut shortly after birth, completing the separation of right and left sides of heart
Term
A typical ECG has three distinguishable waves or deflections known as?
Definition
P QRS T
Term
P QRS T
Definition
P - P wave - lasts about .08s and results from movement of the depolarization wave from the SA node through the atria

QRS - QRS complex - results from ventricular depolarization and precedes ventricular contraction

T wave - caused by ventricular repolarization and typically lasts about 0.16s. More spread out and has a lower amplitude than QRS wave
Term
Cardiac Output
Definition
-CO
-the amount of blood pumped out by EACH ventricle in 1 minute.
Term
Coverings of the Heart
Definition
1) Pericardium - double walled sac that encloses the heart (innermost)

2)Fibrous Pericardium - loosely fitting superficial part of sac, tough dense connective tissue; 1) protects the heart, 2) anchors it to surrounding structures, 3) prevents overfilling of the heart with blood (middle)

3)Serous Pericardium - thin, slippery, two-layer serous membrane (after fp)

4) Parietal Layer - lines the internal surface of the FP

5) Visceral Layer/Epicardium - intergral part of the heart wall (external surface of the heart)

6) Pericardial Cavity - slitlike cavity that contains a film of serous fluid located between parietal and visceral layers
Term
Layers of the Heart Wall
Definition
1)Epicardium/visceral layer (outermost)

2) Myocardium - middle layer

3) Endocardium (inside the heart)
Term
Valves of the Heart (4)
Definition
AV Valves
-Tricuspid Valve
-Mitral Valve

Semilunar Valves
-aortic
-pulmonary
Term
Atrioventricular Valves (AV)
Definition
Tricuspid Valve
-right AV valve
-3 flexible cusps

Mitral Valve
-left AV valve
-(bicuspid valve)
-has two flaps
Term
Semilunar Valves (SL)
Definition
-Aortic and Pulmonary
-prevent back flow into associated ventricles
-each SL valve is fashioned from 3 pocketlike cusps
-shaped like a crescent moon
Term
All valves open and close in response to what?
Definition
-differences in pressure
Term
Chordae Tendonae
Definition
-attaches to each AV valve flap
-tiny white collagen cords
-anchor the cuspids to the PAPILLARY MUSCLES protruding from ventricular walls
Term
End Diastolic Volume (EDV)
Definition
-the amount of blood that collects in a ventricle during diastole
Term
End Systolic Volume (ESV)
Definition
-the volume of blood remaining in a ventricle AFTER it has contracted
Term
Auricles
Definition
-little ear
-small, wrinkled, protruding appendages
-increase the atrial volume somewhat
Term
Atria
Definition
-receiving chambers for blood returning to the heart from the circulation
-small, thin-walled chambers
Term
Size, Location, etc.
Definition
-about the size of a fist
-hollow and cone shaped and is about 250-350 grams less than a pound
-Base is the top part and points toward right shoulder
-Apex is bottom part and points toward left hip
-enclosed within the mediastynum (medial cavity of the thorax)
Term
Tachycardia
Definition
-an abnormally fast heart rate
-more than 100 bpm
-may result from elevated body temp, stress, certain drugs, or heart disease
Term
Bradycardia
Definition
-abnormally slow heart rate
-slower than 60 bpm
-may result from low body temp, certain drugs, or parasympathetic nervous activation
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