Heart Lecture 1 Flashcards
Mediastinum
Connective tissue protecting heart (heart location)
Heart position
2/3rds left body midline
Apex location
5th intercostal space
Base Location
3rd costal cartilage
Pericardium
membrane protecting heart
Fibrous pericardium function
Hold heart in place, prevents stretch, provide protection
Serous pericardium how many layers
Divided in 2 layers
Parietal pericardium layer
Outer layer fused to fibrous layer
Visceral pericardium
Adheres to heart surface
Pericardial cavity
Space b/w parietal and visceral layers
Pericardial fluid
Fluid b/w layers. Reduce friction
Pericarditis
Pericardium inflammation
Cardiac tamponade
excess pericardial fluid
Epicardium
Outer layer of heart
Myocardium
muscle tissue 95% heart mass
Endocardium
smooth lining inside the heart
how many chambers
4 total
2 atria
2 ventricles
Atria
Receives blood from body
Auricles
“little ears” to receive more blood
Septum
Connective tissue separate chambers
Interventricular septum
separate ventricles
Interatrial septum
Separate atrium
Sulcus
Grooves b/w chambers, hold fat/blood vessels
Coronary sulcus
separates atrium/ventricles
Anterior interventricular sulcus
separate anterior ventricles
Posterior interventricular sulcus
separate posterior ventricles
Right atrium
receive from systemic circuit (body)
Right ventricle
receive deoxygenated from right atrium into pulmonary circuit (lung)
Left atrium
receives oxygenated blood from pulmonary circuit (lungs)
Left ventricle
receive from left atrium into systemic circuit (body)
Right Atrium receives blood from (3)
- superior vena cava
- inferior vena cava
- Coronary sinus
RA Anterior wall rough because
pectinate muscles for contractions
Bi-cuspid mitral valve function
control blood passage LA to LV
Fossa ovalis
Oval depression from foramen ovale
Ligament arteriosum
Connect pulmonary trunk to aorta. (Lungs to body)
Ductus Arteriosus
duct connect pulmonary trunk to body
Trabeculae carneae
muscle ridges
Papillary muscles attach where
stick out of trabeculae carneae
Chordae tendineae
attach to valves
Pulmonary valve
Blood pass from RV to lungs
Left ventricle, why stronger
Largest chamber, More muscle to pump blood further
Aortic valve
Where blood passes from LV to aorta
Myocarditis
Inflamed heart muscles (viral infections)
Endocarditis
Inflamed endocardium (bacterial infections)
Pericarditis
Pericardium Inflammation
(viral infection)
which direction blood flows
One-way flow
Pressure changes cause
open/closing valves causing blood flow
valve b/w each ventricle/atrium
Atrioventricular valve
At exit from each ventricle
Semilunar valves