Exam 3 Flashcards
What happens during contraction?
The Apex beats against the chest wall producing an apical impulse
Where is the apical impulse located?
Normally at the fifth intercostal space 7 to 9 cm from midsternal line
The heart is rotated so what side is anterior and what side is posterior
The right side is anterior in the left side is posterior
Atrium
Reservoir for holding blood
Ventricle
Muscular pumping chamber
Pericardium
Tough fibrous double walled sac that surrounds and protects the heart. It has two layers that contain a few milliliters of a serous pericardial fluid does ensure a smooth friction free movement of the heart muscle
Pericardium
Adherent to great vessels esophagus sternum and pleural and anchored to the diaphragm
Myocardium
Muscular wall of the heart it does pumping
Endocardium
Thin layer of endothelial tissue that lines inner surface of heart chambers and valves
And normally high pressures in the left side of the heart gives person symptoms of
Pulmonary congestion
Abnormally high pressures in right side of heart shows in
In neck veins and abdomen
During the pumping phase or systole what happens?
The AV valves close to prevent regurgitation of blood back up into atria
What happens when the AV valves open during hearts filling phase also known as diastoly
It allows the ventricles to fill with blood
How is diastole defined?
Ventricles relax and fill with blood this takes up to 2/3 of cardiac cycle
Systole
Hearts contraction, blood pumped from ventricles Phils pulmonary and systemic arteries, this is 1/3 of cardiac cycle
What are you hearing with the first heart sound S1
Closure of AV valves
What are you hearing when you hear the second heart sound S2
Closure of semi lunar valves and signals end of systole
Name five characteristics of the first heart sound
Onset of systole
Closure of mitral and tricuspid valves
High pitched
Heard loudest at the mitral an apical area
What are four characteristics of the second heart sound
Onset of diastole to end of diastole
Closure of aortic and pulmonic valves
High pitched
Heard loudest at base of heart
Murmur
Gentle blowing, swooshing sound that can be heart on the chest wall
Conditions resulting in murmur
Thyrotoxicosis- in exercise- velocity of blood increases
Anemia- velocity of blood decreases
Structural defects in valves, narrowed valve, incompetent valves
Unusual openings occur in chambers, dilated chamber, wall defect
Conduction
Automaticity- Unique ability of the heart to contract by itself in response to an electrical current conveyed by the conduction system
Sa node
Pacemaker; Discharges impulse between 60 to 100 bpm
P wave
Depolarization of atria
P-R interval
From beginning of P wave to beginning of QRS complex (Time necessary for atria depolarization plus time for impulse to travel through AV node to ventricles)
QRS complex
Depolarization of ventricles