OLT test study Flashcards
structures of the circulatory system
The heart (pump)
- Right side to pulmonary circulation
- Left side to systemic circulation
Peripheral vascular system (tubing)
- Arteries carry oxygenated blood (except for pulmonary arteries)
- Veins carry de-0xygenated blood (except for Pulmonary and umbilical veins)
Hematological system (blood and components)
- Closely inter-linked with the lymphatic system
function of circulatory system
Deliver oxygen, nutrients and other requirements to the cells
Remove and transport waste, such as carbon dioxide to be excreted
Your heart pumps ~ 80 bpm/minute x 80 yrs = 3,363,840,000 times in a lifespan!!!
blood pathway
Blood from right atrium enters right ventricle and pulmonary arteries carry deoxygenated blood from right ventricle to lungs for oxygenation. Two pulmonary veins come from each lung and pass O2-rich blood to left atrium. Blood enters left ventricle from the left atrium.
arterial blood supply originates?
aorta
coronary arteries originate
originate at the start of the aorta to feed the myocardium and they form venules that become veins that empty into the right atrium itself via the coronary sinus
main influence of coronary circulation
the pressure in the Aorta of itself (basically from left ventricle pressure).
- Several disorders of the heart affect heart contraction, therefore strength of the blood being pumped out therefore affecting the strength of the blood being pumped out and therefore the flow of blood of the into heart itself and into the system
blockage or spasm of partcular coronary aretery can leadto…
ischemia of that part of the myocardium fed by that blood vessel.
- The type of myocardial infarction depends on what coronary artery/ branch of an artery is blocked or spasming…
examples of coronary arteries
right coronary artery marginal artery posterior interventricular artery anterior decending artery circumflex artery left coronary arteru aorta
examples of coronary veins
superior vena cava anterior cardiac veins small cardiac vein middle cardiac vein coronary sinus great cardiac vein
what is the pericardial sac
- surrounds the heart. protects cushions and anchors it in place with his various blood vessels and surrounding structures
structures of the heart wall
three layers of the pericardium down through the three linings of the heart wall itself.
Pericardium Parietal and visceral Pericardial cavity and fluid Myocardium Endocardium
functions of the pericardium (outermost layer)
protection, its receptors that respond to changes in blood pressure and pulse at the relative thickness of the myocardium which is much thicker
t or f
continuous supply of blood is essential to body function
t
what facillitates one way blood flow
Correct functioning heart valves facilliitate the one way blood flow, opening and closing of valves functioning correctly
valves during diastole
Diastole (ventricles filling)- the 2 AV valves are open, SL valves closed
what happens to valves once ventricles are full?
When ventricles are full AV valves close, SL valves open
what are the valves
Atrioventricular valves - Tricuspid valve - Mitral valve Semilunar valves - Pulmonary semilunar valve - Aortic semilunar valve
what is cardiac action potential
transmission of electrical impulses that form the conduction system that coordinated the rhythmical nature of the heart
where is AP initiated in heart
AP is initiated in Nodes (Specialized cells that generate and transmit without any nervous system initiation)
what is invlolved in the hearts conduction system
Sinoatrial node (SA)- pacemaker of the heart - Intranodal pathways Atrioventricular node (AV) Bundle of His (AV bundle) Right and left bundle branches Purkinje fibres
what is preload
Preload (the initial stretching of the cardiac muscle cells prior to contraction)
- Left ventricular end-diastolic volume
- Frank-Starling law of the heart
What is afterload
Afterload ( the force or pressure against which the heart has to contract to eject the blood).
- Resistance that must be overcome for blood to be ejected
what is contractility
Contractility (Sstrength and vigour of the heart’s contraction during systole)
What is stroke volume
Stroke volume ( The amount of blood pumped by the left ventricle of the heart in one contraction.)