Ch 19 -Heart Flashcards
Cardiac output
Volume of blood pumped by one ventricle in a minute
Determined by stroke volume and heart rate
Great vessels
Inferior and superior vena cava
Aorta
atrial systole
Atria contract and ventricles are relaxed
Valves
Permit passage of blood in one direction and prevent back-flow
Semilunar and atrioventricular
Wave forms in ECG (EKG)
P wave
QRS complex
T wave
Autorrhythmicity
Heart itself is responsible for initiating the heartbeat
Serous fluid
Between parietal and visceral layer of pericardium
Cardiomyopathy
Disease in myocardium
Major vessels empty into right atrium
Inferior vena cava
Coronary sinus
Superior vena cava
Apex
Inferior
Conical end of the heart
After load
Resistance in arteries to the ejection of blood by the heart
Small cardiac vein
Travels alongside the right marginal artery
SA node
Heartbeat
Chronotropic agent
Chemical
Alters heart rate
Tachyarrhythmia would show abnormal what?
Small Q-T interval
Pulmonary circuit
Deoxygenated blood in arteries
Vagal tone
Decreasing of the heart rate
Parasympathetic
Pericardial cavity location
Between visceral and parietal layers of serous pericardium
Middle cardiac vein
Drains the posterior aspect of ventricles of the heart
Ventricular contraction
Semilunar valves open
AV valves close
Cardiac centers
Medulla oblongata
ANS
Proprioreceptors
Muscles and joints
Inform cardiac centers about changes in activity
Baroreceptors
Aorta and internal carotid arteries
Inform cardiac centers about changes in BP
Chemoreceptors
Aortic arch, carotid arteries, medulla oblongata
Inform cardiac centers about blood O2, CO2, and pH
Angina pectoris
Chest pain caused by obstruction of coronary blood flow
Results in death of myocardial tissue
Myocardial infarction
Death of heart muscle
Caused by blocked coronary circulation
1/2 deaths in US
