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The femur is classified as a:

A.

Irregular bone

B.

Short bone

C.

Long bone

D.

Flat bone

Answer and Explanation

The Correct Answer is C

A. Irregular bone: Irregular bones have complex shapes (for example vertebrae) and do not describe the long, cylindrical femur.
B. Short bone: Short bones are roughly cube-shaped (for example carpals) and do not apply to the femur.
C. Long bone: Long bones are elongated with a shaft and two ends, which describes the femur as the prototypical long bone.
D. Flat bone: Flat bones are thin and plate-like (for example the sternum and skull bones) and are not the shape of the femur.


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Related Questions

Correct Answer is B

Explanation

A. Hinge joint:A hinge joint allows movement in one plane (flexion/extension) like the elbow, not sliding between flat surfaces.
B. Plane joint:Plane (gliding) joints have relatively flat articular surfaces that permit sliding or gliding motions between bones.
C. Ball-and-socket joint:Ball-and-socket joints (shoulder, hip) permit multiaxial movement with a rounded head fitting into a socket rather than flat-surface sliding.
D. Saddle joint:Saddle joints have complementary concave/convex surfaces that allow biaxial movement (e.g., thumb carpometacarpal), not simple flat gliding.

Correct Answer is A

Explanation

A. Secretion of sebum:Sebaceous glands secrete sebum, an oily substance that lubricates and helps waterproof the skin and hair.
B. Production of melanin:Melanin is produced by melanocytes in the epidermis rather than by sebaceous glands.
C. Protection against UV radiation:Protection from UV radiation is mainly provided by melanin produced by epidermal melanocytes, not by sebaceous gland secretions.
D. Temperature regulation:Temperature regulation is achieved primarily through eccrine sweat glands and cutaneous blood flow, not by sebaceous gland activity.

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