P-1 Flashcards
Pulmonary Circuit:
Systemic Circuit:
Pulm circa: from heart to lungs, lungs to heart
Cyst circa: from heart to body, body to heart
Path of circulation in pulmonary circuit:
Right atrium->thru tricuspid->R ventricle-> semilunar valves->pulmonary arteries to lungs->alveolar capillaries of the lungs->pulmonary veins back to heart thru L atrium
Circuit begins when:
Trunk divides into? and this divides into?
- blood leaves right ventricle, enters pulmonary trunk
- Pulmonary trunk divides into R&L Pulm arteries each goes to respective lungs
- each pulm art divides into LOBAR BRANCHES (2) left, (3) right
Left pulmonary artery divides into:
Right Pulm artery divides into:
Superior Lobar Artery, Inferior Lobar Artery
Superior LA, Middle LA, Inferior LA
Lobar branches continue to divide into smaller vessels eventually;
Pulmonary capillaries referred to:
- becoming pulmonary arteries, pulmonary arterioles divide into capillaries.
- Alveolar capillaries- they surround the alveoli (air sacs)
- merge to form pulmonary venules
- pulm venules merge to for pulmonary veins->heart thru L atrium
The RIGHT VENTRICLE contracts with____ when compared to left ventricle.
Results in:
Overall:
- Less force, smaller chamber
- arterial pressure in vessels of pulmonary circuit is LESS when compared to SYSTEMIC CIRCUIT
- Alveolar capillary pressure is LOWER than capillary pressure in systemic circuit (body tissue)
Alveolar Capillary Pressures:
@ proximal end of Alveolar capillaries, arterial pressure is LOW.
- FORCE that moves the fluid and substance out is 23mmhg compared to 37mmhg in systemic capillaries
- FORCE that pulls fluid & subst inward is 22mg
Alveolar capillary pressure at proximal end is 23mmgh this results in;
- continuous flow of fluid & subs into the space(INTERSTITIAL SPACE) between the walls of the capillaries and the walls of the alveoli
- squamous cells that form alveoli are tightly joined and more than normal- prevent substance from entering the alveolar peace (air sacs)
- Trapped particles in space, CREATE high osmotic pressure(way to pull water from airsick)- if fluid is not pulled decreases gas exchange
- Blood in Pulmonary Arteries and Arterioles
2. Blood in Pulmonary Venues and Veins
- High in Co2, Low in O2
2. High in O2, Low in Co2
Blood Vessels of Pulmonary Circuit function:
to transport oxygen to the lungs for gas exchange (obtain o2, rid co2)
DO NOT SUPPLY blood to the lung tissue, done by another set of vessels
Systemic Circuit flow starts with…goes to
-L atrium, L ventricle, Aorta, arteries, arterioles, capillaries, veins back to heart
Ascending Aorta contains what, and where is the location, what is regulated here:
What comes off this structure
- contain swellings in the area of the aortic valve called arctic sinuses, with in these are aortic bodies- chemoreceptors that monitor co2, and o2-helps regulate Respiration and HR via AN system
- R and L coronary arteries- arise from aortic sinuses, distal to aortic valve
Major branches off of Aortic Arch and what they supply:
- Brachiocephalic= R subclavian (R side of head), R common carotid (r upper limb)
- L common carotid ( L side of head)
- L subclavian ( L upper limb)
Descending Aorta has two major divisions which are:
Thoracic Aorta, Abdominal Aorta
Thoracic regions contains, and what do they supply
Bronchial A ( lungs), Pericardial (pericardium), Esophageal (esophagus), Mediastinal (sternal area of chest), Posterior Intercostal A ( chest wall between ribs posteriorly)
