transport in animals Flashcards
define hydrostatic pressure
pressure of blood from heart contractions
define oncotic pressure
tendency of water to move from surrounding fluid into blood
features of blood vessel walls
collagen- structural suport
elastic fibres- give flexibility
smooth muscle- contracts to change size of lumen
name the on eatery that carries deoxygenated blood
pulmonary artery
heart to lungs
describe the walls of arteries
lots of elastic fibre
smooth lining
name the one vein that carries oxygenated blood
pulmonary vein
lungs to heart
describe the walls of veins
lots of collagen
a little elastic fibre
where does deoxygenated blood enter the heart
right side (atrium)
how does blood enter the atria
right= vena cava left= pulmonary vein
what prevents valves being turned inside out
tendinous cords
right= tricuspid
left= bicuspid
how does blood exit the ventricles
right= pulmonary artery left= aorta
name and function of SAN
sion-atrial node
causes atria to contract
name and function of AVN
atrio-ventricular node
picks up electrical activity from SAN
structure and funnel of Bundle of His
conducting tissue made up of purkinye fibres
spread excitation through ventricle walls to trigger ventricle contraction
name of ECGs and what they do
electrocardiograms
electrodes measure electrical differences on skin
