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Which mineral is most critical for bone hardness and strength?

A.

Iron

B.

Sodium

C.

Potassium

D.

Calcium

Answer and Explanation

The Correct Answer is D

A. Iron: Iron is essential for hemoglobin and oxygen transport, not a primary structural bone mineral.
B. Sodium: Sodium is an extracellular electrolyte important for fluid balance and nerve function, not bone hardness.
C. Potassium: Potassium is an intracellular electrolyte important for cell function, not the main bone mineral.
D. Calcium: Calcium (along with phosphate in hydroxyapatite) is the primary mineral that gives bone its hardness and compressive strength.


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Related Questions

Correct Answer is B

Explanation

A. Clavicle:The clavicle is part of the pectoral (shoulder) girdle and belongs to the appendicular skeleton, not the axial skeleton.
B. Sternum:The sternum is a central bone of the thoracic cage (breastbone) and is part of the axial skeleton.
C. Femur:The femur is the thigh bone of the lower limb and is part of the appendicular skeleton.
D. Scapula:The scapula (shoulder blade) is part of the pectoral girdle and belongs to the appendicular skeleton.

Correct Answer is C

Explanation

A. Pivot joint:Pivot joints permit rotational movement around a single axis (for example the atlantoaxial joint) but have limited overall range compared with multiaxial joints.
B. Saddle joint:Saddle joints allow biaxial movement (for example the thumb carpometacarpal joint) and provide greater motion than a hinge but less than multiaxial joints.
C. Ball-and-socket joint:Ball-and-socket joints (such as the shoulder and hip) allow multiaxial movement including flexion/extension, abduction/adduction, and rotation, providing the greatest range of motion.
D. Hinge joint:Hinge joints permit movement primarily in one plane (flexion and extension), giving a more limited range compared with ball-and-socket joints.

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