Straightening the knee is __ of the knee?

Correct Answer: B

Rationale: Extension is straightening the knee, increasing the angle between the femur and tibia, as when standing, driven by quadriceps contraction. Flexion bends the knee, decreasing the angle. Adduction moves the leg toward the midline, abduction away neither straighten it. Extension's role in aligning the leg, a basic joint motion, makes 'b' the correct term in kinesiology.

Correct Answer: B

Rationale: Endocrine glands secrete hormones (e.g., thyroid's thyroxine) directly into the bloodstream, lacking ducts, for systemic effects like metabolism regulation. Exocrine glands use ducts (e.g., salivary glands). Sebaceous and sweat glands , both exocrine, secrete oil and sweat externally. Endocrine glands' ductless, blood-mediated delivery, per glandular classification, makes 'b' the correct type.

Correct Answer: B

Rationale: Psoriasis features uncontrolled skin cell growth, rapid keratinocyte proliferation causing scaly plaques, an autoimmune issue. Eczema is inflammatory, itchy, not proliferative. Dermatitis is irritation-based (e.g., contact). Acne involves oil and bacteria, not cell growth. Psoriasis's hyperproliferation, per dermatopathology, makes 'b' correct.

Correct Answer: A

Rationale: Osteoporosis is a condition where bones weaken and become brittle from reduced density, increasing fracture risk, often age-related or hormonal. It's not a fracture , infection (c, osteomyelitis), or joint disorder (d, arthritis). Its systemic bone loss, per pathology, makes 'a' correct.

Correct Answer: B

Rationale: The shoulder's glenohumeral joint is a ball-and-socket, with the humerus's ball in the scapula's glenoid, allowing wide motion (e.g., rotation). Hinge is elbow, pivot is atlas-axis, saddle is thumb. Ball-and-socket's range, per joint types, makes 'b' correct.