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3 years ago

15

What action within the heart creates the characteristic “lib-dub” heartbeat?

2 answers:

harkovskaia [24]3 years ago

8 0

Valves of the heart oppening and closing

balu736 [363]3 years ago

8 0

A heartbeat is the sound caused by the heart valves opening and closing while they pump blood. A properly working heart only has blood flowing in one direction. This is possible by the valves opening and closing in exact coordination with the heart’s pumping action. Assuming you meant lub-dub, the lub sound is the tricuspid and mitral valves closing. The dub sound is the aortic and pulmonary valves closing. Combined, they make the sound of a heartbeat/the sound of someone's heart working properly.

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shtirl [24]

Answer:

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Explanation:

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The circumference is

$C = \pi d$

where <em>d</em> is the diameter of the wheel.

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Korvikt [17]

Answer:

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t1 = 14s

t2 = 18s

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multiply the average velocity with the change in time

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now we'll add this value to the initial position of the car

(99, 80, 27)m + (16, 0, -12)m = (115, 80, 15)m

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