2006-09-29 08:56:14 · 25 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
Just the one... but it is an extra big heart...
A giraffe's heart, which can weigh up to 10 kg (24 lb), has to generate around double the normal blood pressure for a large mammal in order to maintain blood flow to the brain against gravity
Hope that helps.
ps. An Octopus has 3 if anyone is interested.
2006-09-29 09:06:01 · answer #1 · answered by â?¥MissMayâ?¥ 4 · 3⤊ 0⤋
1
The giraffe's heart is an enormous two feet long and twenty-five pounds, with muscular walls several inches thick, driving the highest known blood pressure in any mammal: up to 280/180 mm Hg (millimeters of mercury) at heart level when prone, or more than twice that of ours. The heart beats up to 170 times a minute - also double our own. The secret of the giraffes' physiological equanimity lies in its blood vessels. The elastic walls of the lengthy carotid artery help force blood upward, then swell to absorb excess fluid when the head is lowered; in addition, each inch-wide-plus jugular vein contains a series of one-way valves that prevent back-flow of the blood when the giraffe's head is down. When the head snaps back up, the pumping of the massive heart keeps blood flow constant.
2006-09-29 09:04:46 · answer #2 · answered by cuteniceprty 2 · 0⤊ 0⤋
This Site Might Help You.
RE:
How many hearts does a giraffe have?
2015-08-23 23:44:21 · answer #3 · answered by ? 1 · 0⤊ 0⤋
A giraffe's heart, which can weigh up to 10 kg (24 lb), has to generate around double the normal blood pressure for a large mammal in order to maintain blood flow to the brain against gravity.
2006-09-29 09:05:26 · answer #4 · answered by Anonymous · 0⤊ 0⤋
An earth worm has FIVE hearts. Surely though, a giraffe has only ONE heart, the same as just about every mammal.
2006-09-29 09:05:00 · answer #5 · answered by Strawberry_Lynn 5 · 0⤊ 0⤋
Giraffes have one heart that can weigh up to 24 lbs.
2006-09-29 16:15:30 · answer #6 · answered by butterflylo 2 · 0⤊ 0⤋
I think their heart is at the base of the neck. A giraffe's heart weighs 24 pounds.
2016-03-13 04:19:00 · answer #7 · answered by Greta 4 · 0⤊ 0⤋
One
2006-09-29 09:03:07 · answer #8 · answered by ladida 3 · 0⤊ 0⤋
One
2006-09-29 08:57:32 · answer #9 · answered by interested_party 4 · 0⤊ 0⤋
Last time I checked, a giraffe had only one heart.
Chow!!
2006-09-29 09:06:21 · answer #10 · answered by No one 7 · 0⤊ 0⤋