+
Related Flashcards
Cards In This Set
| Front | Back |
|
All animals from sperm+egg
|
Ex ovo omnia
William Harvey |
|
Artery layers
|
Connective TissueSmooth muscles / Elastic TissueEndothelial cells(lumen)
|
|
Artery types
|
ELASTIC - thick walled, near heart, elastin in all three tunics
MUSCULAR - blood to organs , less elastin more myo ARTERIOLES - blood to capilaries, less CT |
|
Veins
|
Thinners walls, myolarger lumen, more blood
moved by sk. myo, backflow stopped by valves |
|
Capilaries
|
Thin endothelial layer = wall
exchange gas/nutrients via diffusion (active transport for large molecules) |
|
Capillary Beds
|
Btw arterioles and venules
sphinters at ends or arterioles -> reg blood flow |
|
Blood Flow
|
F = Pressure / Resistance
pressure = force exerted on vessel walls, aorta pressure strongest |
|
Resistance
|
1 Blood viscosity
2 Vessel length (^length -> ^R) 3 Vessel diameter (smaller diameter -> ^R) constricting diameter = best way to increase P |
|
Systemic BP
|
Systolic (during ventricular contraction) (120)
MAP - mean arterial pressure (highest in aorta, 0 in R atrium) Diastolic (during relaxation) (80) |
|
Cardiac Output
|
CO = MAP / Peripheral Resistance
(F = P / R) maintain BP |
|
BP controls
|
Short term-alter resistance-by NS and chemicals
Long term-reg blood volume |
|
Nervous System Reg
|
SYMPATHETIC--keep vessels slightly constricted-if ^BP -> baroreceptors to medulla -> inhibit SNS -> dilate vessels
PARASYMAPATHETIC-if ^BP -> PNS to SA node -> down CO -> down BP |
|
Hypertension
|
Local ruptures, hemorrhage, elastic damage, backflow pressure in heart
TREAT-vasodilation-^urine production (b/c down vol) -> restrict salts (need less blood to keep body dilute) |
