the astronaut heart and muscles and bones shrink and get weaker ...this because:
the earth's gravitational pull is strong so the heart pumps blood harder than it needs to in space so when a astronaut is in orbit it doesn't need to work so hard so they shrink.
hope this helps.
Wiki User
∙ 13y agoWhat happens to the bones when muscle shortening
What happens to your bones when you are weightless, is that your bones will get weaker and weaker. That is why everyday, astronauts, have to spend two hours on a treadmill everyday of there space expedition.
Skeletal muscle tissue is striated muscle tissue connected to bones.
Muscle
ligaments attach bone to bone and tendons attach bone to muscle
Astronauts' muscles atrophy in space due to the decreased work they do without Earth's gravity.
The bones itself do not move, but it's the muscle that moves it.
ligaments. tendons are muscle attached to muscle.
hi hows your muscle
skeletal muscle Joints
Smooth Muscle
If you think about it, skeletal muscle are muscles that connect bones. So wherever you have bone, it is covered with skeletal muscle. Muscles do not connect bones. Muscles are the source for movement and protection for bones.