Mod 2- Cardiovascular Flashcards
circulatory system consists of (3)
- heart
- pulmonary circulation
- systemic circulation
3 layers of heart out to in
pericardium/epicardium
myocardium
endocardium
outer to inner layer of blood vessels
tunica adventitia
tunica media
tunica intima
what are the 3 main groups of arteries and what differentiates them
Conducting (elastic)- closest to heart
Distributing (muscular)- smaller diameter/ slow bf (femoral artery)
arterioles (capillaries)
structure of tunica intima
simple squamous epithelium
- elastic/collogen fibres
- mesenchymal cells
structure of tunica media
smooth muscle (for constriction/dialation)
Structure of tunica adventitia
loose network of connective tissue elastic fibrils, blood vessels + nerves
what do enthothelial cells secrete and what does it do
Angiotensin converting enzyme which cleaves angiotensin to angiotensin II that regulates arterial BP, nitric oxide
what is the makeup of elastic muscle
elastic bands with smooth muscle and collagen in between
what is the muscular artery characterized by
thick tunica media ( mostly smooth muscle cells)
tunica advent with external elastic lamina, collagen fibres, elastic fibres
what are arterioles and what do they do
they are terminal arterial vessels that regulate BP and well as BF into capillary beds
what are the different tunicas made up of in arterioles
intima- type 3 colleges connective tissue
media- single smooth muscle layer
Adventitia- fibroelastic connective tissue
what are continuous capillaries and where are they present
muscle, nervous and connective tissue
have fascia occuledents which prevent passage of molecules
where are fenestrated capillaries found and what do they do
pores big enough to let certain molecules in and out
found in pancreas, intestines and endocrine glands
where are sinusoidal caplilaries found and what are they
enlarged diameter
enlarged fenestae that allow for enhanced exchange between blood and tissues
