Final answer:
The inside of a bone sensitive to dietary calcium changes is called the endosteal region. Here, the endosteum plays a critical role in bone growth and repair. Imbalances in dietary calcium, affected by vitamin D levels, can lead to significant skeletal system issues.
Step-by-step explanation:
The inside of a bone that is more sensitive to changes in dietary calcium intakes is called the endosteal region. This region is lined with a delicate membranous lining known as the endosteum, where bone growth, repair, and remodeling occur. When there are low levels of calcium (hypocalcemia), it can lead to a depletion of calcium stores in the skeletal system. The process of balancing calcium levels in the body involves the action of parathyroid hormone (PTH), vitamin D, and calcitonin, which regulate the storage and release of calcium from the bones.
During the healing process of a broken bone, an internal callus forms, which is a fibrocartilaginous matrix in the endosteal region between the two ends of the broken bone. This internal callus is crucial for the stabilization and healing of the fracture.
Calcium is vital for bone health and is absorbed through the intestines under the influence of activated vitamin D. Without adequate vitamin D, calcium absorption decreases, paving the way for bone-related diseases such as rickets, osteomalacia, and osteoporosis.