Why is it that if you lock your knees (essentially cutting off circulation to your lower legs) you will faint? I thought fainting was blood not getting to your brain.
2006-06-28 11:20:01 · 4 answers · asked by jdimmitt22 2 in Science & Mathematics ➔ Other - Science
Vasovagal syncope: Also known as the "common faint," this is the most frequent cause of syncope. It results from an abnormal circulatory reflex. The heart pumps more forcefully and the blood vessels relax, but the heart rate does not compensate fast enough to maintain blood flow.
2006-06-28 11:25:16 · answer #1 · answered by Briz 1 · 2⤊ 0⤋
You may notice soldiers standing at attention for long periods tend to look as if their leaning back a little. This little arching of the legs allows the blood to flow even though the knees are locked.
Cutting off the flow drastically affects normal blood pressure.
2006-06-28 12:03:06 · answer #2 · answered by Dale P 6 · 0⤊ 0⤋
I think that once the blood goes into your legs it doesn't come back up, essentially closing the circuit and it can't get up to your brain.
2006-06-28 11:22:32 · answer #3 · answered by Supertramp_82 2 · 0⤊ 0⤋
maybe poor circulation throughout your body? im not entirely sure but i hate when that happens
2006-06-28 11:34:19 · answer #4 · answered by fullmetalfreak1993 2 · 0⤊ 0⤋
ask a doctor, that doesn't sound right.
2006-06-28 11:44:39 · answer #5 · answered by ? 2 · 0⤊ 2⤋