When astronautes go to space because of the lack of gravity the heart does not have to work as hard and so gets weaker.... BUt why doesn't it have to work as hard?
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2007-02-15 05:48:58 · 5 answers · asked by Ali 1 in Science & Mathematics ➔ Astronomy & Space
How long would it take for an astronaut's heart to recover if he/she landed on mars?
2007-02-15 06:02:24 · update #1
the weight of the blood. to pump up (or round) 4 liters of blood takes energy,and is the same time training of the hart muscle. in space there is no or little weight, the hart has less to do an in the long term gets lazy, or/and weaker.
2007-02-15 05:56:15 · answer #1 · answered by peternaarstig 3 · 0⤊ 0⤋
The pumping action of the heart changes in power levels as a function of the weight of the blood fluid its circulating. Therefore the less gravity in the fluid the less energy the heart uses in its process.
The heart only get weaker if it does not have enough nutrition and oxigen. Other wise the heart is a self adjusting system.
Other muscles in the body may atrophy by lack of usage.But again as usage is more demanding the body will rebuild mussle tissue to meet its power demand.
2007-02-15 06:11:21 · answer #2 · answered by goring 6 · 0⤊ 0⤋
Because of the lack of gravity. Arms and legs don't have to fight gravity and so need less blood to the muscles.
2007-02-15 05:55:29 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The heart pumps blood.
The blood has mass, and so weight dependent upon gravitational force.
The work done to move that weight of blood volume is less in weightless conditions.
The heart works less hard, and muscle tone is lost (decondtioning).
2007-02-15 06:00:41 · answer #4 · answered by Jerry P 6 · 0⤊ 0⤋
gravity affects the muscles
2007-02-17 03:36:50 · answer #5 · answered by chloes 1 · 0⤊ 0⤋