Which part of the skeletal system protects the brain?

A. Detection of chemical changes: Chemoreceptors respond to chemical stimuli, such as changes in oxygen, carbon dioxide, or pH, rather than mechanical forces.

B. Detection of mechanical stimuli such as pressure and vibration: Mechanoreceptors are specialized to sense physical deformation of tissues, including pressure, vibration, touch, and stretch, providing critical information about the environment and body position.

C. Detection of light stimuli: Photoreceptors in the eyes detect light and are not involved in sensing mechanical changes.

D. Detection of temperature changes: Thermoreceptors respond specifically to heat or cold, not to mechanical forces like pressure or vibration.

A. Dehydration: Dark, concentrated urine is commonly caused by reduced water intake or excessive fluid loss. The kidneys conserve water, resulting in a higher concentration of solutes and darker urine color.

B. Excess protein consumption: High protein intake can slightly alter urine composition, but it does not usually cause dark or concentrated urine unless accompanied by dehydration.

C. Excess fluid intake: Increased fluid intake dilutes urine, making it lighter in color rather than dark and concentrated.

D. Kidney failure: Kidney failure can alter urine output and composition, but early stages often result in reduced urine volume rather than concentrated, dark urine specifically caused by dehydration.