Blood Vessels WK8 L3 Flashcards
WHAT IS THE GENERAL FUNCTION OF ARTERIES?
ARTERIES TAKE BLOOD AWAY FROM THE HEART - VEINS GO TOWARDS
WHAT IS THE GENERAL STRUCTURE OF ARTERIES?
ARE ALL ARTERIES TH SAME SIZE?
NO - THE FURTHER AWAY THE ARTERIES ARE FROM THE HEART THE SMALLER THE DIAMETER
WHAT ARE THE SMALLEST TYPE OF ARTERIES?
ARTERIOLES
WHAT DO ARTERIOLES DO?
CONTROL THE AMOUNT OF BLOOD FLOW INTO THE CAPILLARY BEDS WITH VASDIALATION AND VASOCONSTRICTION
HOW TO THE TISSUES GET OXYGEN AND NUTRIENTS?
THROUGH CAPILLARY BEDS
HOW MNAY LAYERS ARE THERE TO ARTERIES AND VEINS?
3
WHAT ARE THE LAYERS OF ARTERIES AND VEINS?
INNER LAYER - TUNICA INTIMA
MIDDEL LAYER - TUNICA MEDIA
OUTTER LAYER - TUNICA EXTERNA
WHAT IS THE INNER LAYER / TUNICA INTIMA. MADE UP OF?
SMOOTH LAYER OR SIMPLE SQUAMOUS EPITHELIUM CELLS
WHAT DOES THE INNER LAYER / TUNICA INTIMA DO?
LINES THE BLOOD VESSELS AND REPELS RED BLOOD CELLS FROM STICKING TO WALLS
WHAT IS THE MIDDLE LAYER / TUNICA MEDIA MADE UP OF?
THICKEST LAYER MADE UP OF SMOOTH MUSCLE -
WHAT DOES THE MIDDLE LAYER / TUNICA MEDIA DO?
CONTRACTS AND RELXAES FOR VASODIALATION AND VASORESTRICTION
WHAT IS THE OUTTER LAYER / TUNICA EXTRENA MADE UP OF?
LAYER OF CONNECTIVE TISSUE
WHAT DOES THE OUTTER LAYER / TUNICA EXTERNA DO?
PROVIDES STRUCTURAL SUPPORT TO BLOOD VESSELS
DO VEINS OR ATERIES HAVE A LARGER LUMIN?
VEINS
DO VEINS OR ATERIES HAVE A THICKER MUSCULAR LAYER?
ARTERIES
WHY DO LARGER ARTERIES HAVE MORE FIBRE?
TO ACCOMMODATE FOR MORE STRETCH FOR BLOOD PRESSURE DURING HEART RELAXATION
WHAT DO THE MEDIUM ARTERIES DO?
DICTATE WHERE THE BLOOD IS DIRECTED BY VASODIALLATION OR VASOCONTRICTION
DO CAPILLARIES HAVE A MUSCULAR LAYER IN THE WALLS?
NO
DO VEINS OR ARTERIES HAVE A HIGHER PRESSURE?
ARTERIES
WHY DO ARTERIES HAVE A HIGHER PRESSURE?
THEY HAVE THE HIGHEST PRESSURE OF BLOOD FLOW
WHAT MODIFICATION DO VEINS HAVE THAT ARTERIES DO NOT?
VALVES THAT STOP THE BACKFLOW OF BLOOD DURING MUSCLES RELAXATION
WHAT ARE THE SMALLEST VEINS CALLED?
VENULES
WHAT DO VENUELS DO?
DRAIN THE CAPILLARY BEDS
WHAT ARE ELASTIC ARTERIES?
AORTIC AND PULMONARY ARTERIS THAT HAVE MORE ELASTIC TISSUES IN THE TINCA MEDIA
WHAT DO THE ELASTIC ARTERIES DO?
MAINTAIN A RELATIVELY CONSTANT PRESSURE IN THE ARTERY TO CONTROL AND MAINTAIN BLOOD PRESSURE
WHAT ARE THE MUSCULAR ARTERIES?
MUSCULAR ARTERIS LILE BRACHIAL RADIAL AND FEMEROL THAT HAVE MORE SMOOTH MUSCLE IN THE TUNICA MEDIA
WHAT DO THE MUSCULAR ARTERIES DO?
DRAWS BLOOD FROM ELASTIC ARTERY AND DELIVERS IT TO ORGANS AND BODY
WHERE DO THE SMALLEST ARTERIES FEED INTO?
THE MUSCULAR ARTERIES
WHAT IS A META ARTERIOLE?
A TYPE OF ARTERIOLE THAT CAN CONNECT DIRECTLY TO A VENULE AND BYPASS CAPILLARY BEDS
WHAT ARE PRE CAPILLARY SPHINCTERS?
CONTRACT AND RELAX TO ALLOW BLOOD FLOW INTO CAPILLARIES TO REGULATE BLOOD FLOW
HOW MANY TYPES OF CAPILLARIES IS THERE?
3
WHAT ARE THE THREE TYPES OF CAPILLARIES?
CONTINUOUS CAPILLARIES
FENESTRATED CAPILLARIES
SINUSOID CAPILLARIES
WHAT ARE CONTINUOUS CAPILLARIES?
CAPILLARIES THAT HAVE A LINING WHERE ONLY SMALL MOLECULES CAN PASS THROUGH LIKE A SINGLE BLOOD CELL
WHAT DO CONTINUOUS CAPILLARIES DO?
MOVES SUBSTANCES TO AND FROM THE BLOOD STREAM TO AND FROM ORGANS
WHAT ARE FENESTRATED CAPILLARIES?
CAPILLARIES THAT HAVE SMALL OPENINGS THAT ENABLE GAS EXCHANGE
WHAT DO FENESTRATED CAPILLARIES DO?
INCREASE THE FLOE OF NUTRIENTS AND WASTE PRODUCTS
WHAT ARE SINUSOID CAPILLARIES?
HAVE SMALL OPENING THAT ALLOW ONLY SOME SUBSTANCES THROUGH
WHAT DO SINUSOID CAPILLARIES DO?
