Which of the following tissues is defined by its ability to increase tension and contract?

A. Femur:The femur (especially the femoral neck) is a common site of osteoporotic hip fractures but not the single most frequent site overall.
B. Vertebrae:Vertebral bodies are frequently weakened by osteoporosis and commonly fracture, leading to compression fractures and height loss.
C. Humerus:The proximal humerus can fracture with osteoporosis but is less commonly affected than vertebrae and hip.
D. Tibia:The tibia is a strong weight-bearing bone and is a less typical primary site for osteoporosis-related fragility fractures.

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.