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Questions about Blood Flow & Cut Flowers

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Questions about Blood Flow & Cut Flowers

Postby vertciel » Sun Feb 24, 2008 6:35 pm

Hello everyone,

I am unsure of the following concepts and I'd appreciate some help. Thank you!

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For #1 and #2, could someone please either simply confirm the statement? For #3, I have an educated guess but could someone please explain fully?

1. Blood flows through the heart muscle during relaxation.

2. Blood flows throughout the body when the heart muscle contracts.

3. When you buy a bouquet of cut flowers, the florist tells you to cut the stems again before putting the flowers in a vase. Why might this help the flowers last longer?

- My take: After buying the cut flowers, roots might begin to grow so by cutting the stems again, you cut off any new roots and expose the xylem and phloem (xylem in particular) directly to the water in the vase. This will help the plant to live longer because it can have better access to water.
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Postby genovese » Sun Feb 24, 2008 7:16 pm

1 & 2 look correct to me.
As for cutting the stems of the flowers, I have always assumed that air has got into them from the time taken to bring them from the shop to your home and this prevents capillary action. So you cut higher up the stem (above the supposed air bubble) to fluid filled stem parts which can then absorb the water in the vase by capillary action.
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Postby MrMistery » Sun Feb 24, 2008 7:57 pm

agreed with genovese. Plant physiology books describe this phenomenon as cavitation or cavitational emboly
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Postby vertciel » Sun Feb 24, 2008 8:42 pm

Thank you very much genovese and MrMistery for your help!
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Re: Questions about Blood Flow & Cut Flowers

Postby pamela21 » Sat Mar 01, 2008 5:56 pm

blood flow from the heart to the liver back to the heart
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Postby MichaelXY » Sun Mar 02, 2008 3:41 am

I think you skipped a few organs and tissues.
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Postby MrMistery » Sun Mar 02, 2008 3:07 pm

i think he was thinking of the portal hepatic circuit, but got things mixed up
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