Question

Please help me with these muscle and bone questions ASAP.

Bones' hardness is made up of ________. Bones' crystals, layered for strength, gradually dissolve and are carried away by the bloodstream. They are replaced every ______.

The ______ is the most massive because it must support the upper torso and protect the spinal cord. It contains ______ vertebrae, separated by soft discs, and ends at the ______.

Muscles are "fired" _____, the action of coming from the attraction of different protein in their fiber. Muscle cells are as thin as hair and some are to _____ long. For maximum effort, muscles produce energy which doesn't require _____. _____ build-up causes pain and fatigue.

Answer 1

Answer: 1; framework of a protein called collagen , with a mineral called calcium phosphate

2; 1o years

Step-by-step explanation:

1;The hardness and rigidity of bone is due to the presence of mineral salt in the osteoid matrix, which is a crystalline complex of calcium and phosphate (hydroxyapatite).