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There are 2 types of cells that populate living bone: osteoblasts (cells that build new bone) and osteoclasts (cells that destroy and recycle old bone).
A feedback system based on stresses in the bone keeps the operation of these cells in balance. Where there is more stress the osteoblasts become more active and strengthen the bone, where there is less stress the osteoclasts become more active and weaken the bone. Normally gravity and movement provide these stresses needed to keep the bones healthy.
However in the low gravity environment of space, the stresses are insufficient and imbalance results with the osteoclasts becoming more active and the bones become unhealthily weak.
What else can I help you with?
Because astronauts are falling through space with their spacecraft they experience this?
Because astronauts are falling through space with their spacecraft, they experience a condition known as microgravity, which creates a sensation of weightlessness. This occurs when both the spacecraft and the astronauts are in free fall towards Earth, creating an environment where the effects of gravity are significantly reduced. As a result, astronauts can float freely within the spacecraft, allowing them to conduct experiments and perform tasks without the constraints of gravity.
Is this statement true or false-one skeleton times one skeleton equals one skeleton?
It equals one skeleton squared.
In china what are astronauts called?
Chinese astronauts are known as Taikonauts.
When was The Ragged Astronauts created?
The Ragged Astronauts was created in 1986.
What careers did early astronauts have before they were astronauts?
Almost all of the early astronauts were military (and some civilian) test pilots.
Why skeleton of astronauts turn red in space?
I don't think that they do. However astronauts skeleton's do tend to lose some of their calcium while in space. This is because the lack of gravity means that the skeleton is not stressed. To try and prevent this calcium loss astronauts try and exercise hard (to stress the bones) if they are in space for a long period.
Do squid have an exo- skeleton?
No. Squid have a vestigial, or highly reduced, internal feather-shaped shell called a "pen".
How do astronauts overcome gravity in space?
Astronauts in space experience microgravity, where they are in a state of continuous free fall around the Earth. This creates the sensation of weightlessness. They do not completely overcome gravity, but rather experience an environment where the effects of gravity are significantly reduced due to the spacecraft's orbital motion.
Because astronauts are falling through space with their spacecraft they experience this?
Because astronauts are falling through space with their spacecraft, they experience a condition known as microgravity, which creates a sensation of weightlessness. This occurs when both the spacecraft and the astronauts are in free fall towards Earth, creating an environment where the effects of gravity are significantly reduced. As a result, astronauts can float freely within the spacecraft, allowing them to conduct experiments and perform tasks without the constraints of gravity.
What's the definition of Osteoporosis?
Osteoporosis is a disease characterized by increased porosity of the skeleton resulting from reduced bone mass. The associated structural changes predispose the bone to fracture.
What impact does the movement on the moon have on the behavior of astronauts during space missions?
The movement on the moon affects astronauts' behavior during space missions by causing them to experience reduced gravity, which can lead to changes in their balance, coordination, and muscle strength. This can impact their ability to move around and perform tasks in space.
Why do you think teachers are selected as astronauts?
Because teachers can be in the astronauts and they learned about astronauts and they went to the astronauts team.
What is skeleton systems?
skeleton system is a system about the skeleton.
Why were the Apollo astronauts able to take a giant leap on the moon?
The phrase was a metaphor for Mankind's technical progress, but the astronaut's gait on the Moon's surface was slightly jumpy due to their reduced weight.
What is skeleton in Spanish?
"Esqueleto" is skeleton in Spanish.
Does a sea horse have a endo skeleton exo skeleton or a hydrostatic skeleton?
It is endoskeleton. Seahorses have an interior skeleton.
How is a rodent skeleton different frome a vole skeleton?
A rodent skeleton is not different from a vole skeleton. A vole skeleton is just one of many types of rodent skeleton. That is because voles are a type of rodent.
