Body Fluids And Circulation- Double Circulation Flashcards
Pulmonary circulation
RA to Lungs to LA
Systemic circulation
LV to body to RA
Portal system ≠
Renal portal system
Hepatic
Hypophyseal
Coronary
Renal
Kidney
When glomerular filtration is absent
Reduced in reptiles and Bird, absent in mammal, lampreys, hagfish
Hypophyseal
From hypothalamus to anterior lobe of Pituitary gland
Hepatic
Liver and digestive track
Liver 2 blood supply
1: O2 feom hepatic artery
2: CO2 from hepatic portal vein but with nutrition
Coats or Tunics +
Tunica externa: fibrous, collagen
Tunica media: smooth, elastic
Tunica intima/ interna: 1 ellastic (yello fibers), thicker in artery
2 endothelium, flattened squamous lining the lumen, elongated in artery
Nodal tissue
Heart is autoregulated by specialised muscle
Nervous control
Medulla oblongata
Sympathetic and parasympathetic cause depolarisation of sa node
. sympathetic and parasympathetic
Symp, noradrenaline accelerates heartbeat,
Para, acetylecholine
Angina Pectoris
Chest pain, o2 less
Coronary artery disease
Atherosclerosis
Deposition of calcium, fat, cholesterol
It makes lumen of artery narrow
ECG:
PQ or PR
Spreading of impulse in atria
Rehumatic fever, arteriosclerosis
0.16 s
Enlarges if heart attack
ST ECG
Impulse and repolarization time
Inc in heart attack, depressed in low o2
T ECG
Flat in AP