As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). if the blood speed increases by a factor of 4.00 and the total cross-sectional area of the venules is 10.0 cm2 , what is the total cross-sectional area of the capillaries feeding these venules? (b) how many capillaries are involved if their average diameter is 10.0 µm?

capillaries are 5.09 ×

Explanation:

Given data

area = 10.0 cm2

speed = 4.00

average diameter = 10.0 µm

to find out

total cross-sectional area and How many capillaries

solution

we apply here continuity equation

a1× v1  =a2 ×v2

we know v2 /v1 = a1/a2 that is equal 4

so here a1 will be

= 4 × 10

so a1 is 40 cm²

and capillaries are a1/ area

area = /4 × 10 ² ×

capillaries are = 40 × /   /4 × 10 ² ×

capillaries are 5.09 × [tex]10^{7}

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

the device is called “ rocket engine”