Depends on what mountain you are on
If you are on Everest, then the amount of effective oxygen available would be 6.9% (0 altitude would be 20.9)
that is why anyone should always bring oxygen tanks when climbing a high mountain
An expansion in venous tone will increment heart yield and increment mean blood vessel weight. All blood vessel and venous vessels under basal conditions display some level of smooth muscle compression that decides the breadth, and thus tone, of the vessel.
The humerus and femur are joint bones, while vertebrae and carpals connect together to create a much bigger bone.
