<Dl> <Dd> P I = v s y s t o l e − v d i a s t o l e v m e a n (\ displaystyle PI = (\ frac (v_ (systole) - v_ (diastole)) (v_ (mean)))) </Dd> </Dl> <Dd> P I = v s y s t o l e − v d i a s t o l e v m e a n (\ displaystyle PI = (\ frac (v_ (systole) - v_ (diastole)) (v_ (mean)))) </Dd> <Table> Relation between blood flow velocity and total cross-section area in human <Tr> <Th> Type of blood vessels </Th> <Th> Total cross-section area </Th> <Th> Blood velocity in cm / s </Th> </Tr> <Tr> <Td> Aorta </Td> <Td> 3--5 cm </Td> <Td> 40 cm / s </Td> </Tr> <Tr> <Td> Capillaries </Td> <Td> 4500--6000 cm </Td> <Td> 0.03 cm / s </Td> </Tr> <Tr> <Td> Vena cavae inferior and superior </Td> <Td> 14 cm </Td> <Td> 15 cm / s </Td> </Tr> </Table> <Tr> <Th> Type of blood vessels </Th> <Th> Total cross-section area </Th> <Th> Blood velocity in cm / s </Th> </Tr>

Where does blood flow have the highest velocity