L10 Flashcards
is pressure high or low in venous system?
low
Is pressure high or low in arterial system?
high
what equation is used to find flow?
Q = Pressure difference/resistance
what equation is used to find mean arterial presusre?
Q (flow) x resistance
how is cardiac output determined?
stroke volume x heart rate
contraction strength, contraction rate
What is the function of AV node
Pauses electrical signal while the atria finish contracting
What are the 3 general functions of blood?
Transport
immune response
coagulation
What are the 3 main transports of blood?
O2, water, nutrients, CO2 waste products
What are the 3 other transports of blood?
Heat, Hormones, immune cells and coagulation factors
what is coagulation and how?
Stop bleeding, platelets, coagulation
what is the 2 main composites of blood?
plasma and formed elements
What is in plasma?
water, plasma proteins, other solutes
What does plasma proteins do?
maintain osmotic pressure and immune response
What are in formed elements?
platelets, red and white blood cells
What do formed elements do?
immune response
what is haematopoiesis?
formation of blood cells, in red bone marrow from stem cells
blood cells are progenitors for all blood cells
What is the shape of eythrocytes and why?
biconcave disc, large surface area:volume ratio for diffusion for transport
flexibility
What is inside an erythrocyte?
Haemoglobin
what is erythropoiesis? EPO
Production of RBC requiring iron to make haemoglobin
how does your body know to EPO?
kidney senses low oxygen and releases EPO to bone marrow stimulating RBC production
