X A&P - Chp 14 - The Heart and Heart Disease Flashcards
Myo
Muscle
Peri
Around
Septum
Wall
Stenosis
narrowing of the spinal column that causes pressure on the spinal cord
tachycardia
faster than normal heartrate (100 bpm or higher)
bradycardia
slow heartbeat
60 bpm or slower
Heart is located in the M…
Mediastinum (behind the sternum)
Portion of Aorta above Abdomen
Thoracic Aorta
Portion of Aorta below Abdomen
Abdominal Aorta
Layers of Heart (see image)
- Endocardium (smooth like teflon)
- Myocardium (muscle)
- Epicardium aka Serous Pericardium aka Visceral Pericardium (touches heart directly, thin outermost layer)
Parietal Pericardium
Outermost later of Pericardium (see balloon fist image)
Structure of Pericardium
- Outer fibrous pericardium
- Serous pericardium (parietal layer fused to pericardium, Visceral later, fused to myocardium)
Features of Myorcardium
- striated (actin, myosin)
- single cell nucleus
- involuntary
- intercalated discs
- branching muscle fibers
CABG test
Coronary Artery Bypass Graft test
Heart: Right side pumps ?
blood low in oxygen to lungs (via pulmonary circuit)
Heart: Left side pumps ?
Oxygenated blood to body (via systemic circuit)
4 chambers of heart
R and L Atria
R and L ventricle
Right Atrium
receives low O blood returning from body through superior and inferior vena cava
Right Ventricle
pumps blood from right atrium to lungs
Left Atrium
received high O blood from lungs
Left Ventricle
pumps O blood to body
Superior Vena Cava
drains head and shoulders
Inferior Vena Cava
delivers blood to bottom half
Semi Lunar valves aka
Pulmonary and Aortic valve
Right AV Valve (atrium to ventricle) aka
Tri-Cuspid valve
TRI to do right, but if you go to the left you have gone BI-BI
Left AV Valve (atrium to ventricle) aka
Bi-Cuspid valve (Mitral Valve)
TRI to do right, but if you go to the left you have gone BI-BI
Artery takes blood where?
Away from heart (oxygenated, red)
Vein takes blood where?
Towards heart (de-oxygenated, blue)
Valves btwn Atria/Ventricle
- Tricuspid (Right AV)
- Bicuspid (Mitral)(Left AV)
Exit valves
- Aortic
- Pulmonary (pulmonic) (only vein to carry Oxygenated blood)
Only valve to carry Oxygenated blood
Pulmonary Valve - to lung
5L blood circulate every X min
4 minutes
Coronary Arteries
Blood supply to myocardium
Systole (.8s)
Active
Diastole (.2s)
At rest
Cardiac Output
volume of blood pumped per minute
CO = SV x HR
Ecocardiogram
only way to get value for stroke volume
Stroke Volume
amount of blood pushed out per beat
Heart rate
heartbeats per minute
CO =
SV x HR
ml/min
SA Node
Sinoatrial node (heart’s pacemaker)
- irritable tissue (reacts to most stimulants)
- 80-100bpm
AV Node
Atrioventricular Node (btwn atria and Ventricle)
Hearts Conduction System
- SA Node
- AV Node
- AV Bundle of HIS
- Purkinje fibers (web of muscle to send electrical waves)
Sinoatrial Node bpm
80-100 bpm
Av node bpm
60-80bpm
NSR
Normal Sinus Rythm
heart rate in normal range 60-100 beats per minute w steady rate, aside from variations due to respiration.
What other than the sA node can set pace of heartbeat?
1) autonomic nervous system
2) endocrine system
Autonomic Nervous System
- sympathetic NS speeds up heart
- parasympathetic slows it down (cranial nerve x, Vegas nerve
Tetralogy of Fallot
4 defects that happen together
Methods of Studying Heart
- stethoscope
- electrocardiograph
- catheterization
- echocardiography