Which connective tissue type is characterized by a gel-like matrix?

Correct Answer: C

Rationale: Cartilage has a gel-like matrix, a firm, flexible ground substance of chondroitin sulfate and water, supporting structures like the ear or joints without rigidity of bone. Bone has a hard, calcified matrix. Blood is fluid (plasma), not gel-like. Adipose stores fat, with minimal matrix. Cartilage's semi-solid, resilient matrix, distinct from other connective tissues' properties, makes 'c' the correct answer.

Correct Answer: B

Rationale: A compound (open) fracture breaks through the skin, exposing bone, risking infection (e.g., tibia piercing). Simple stays internal. Stress is microdamage from overuse. Greenstick bends, common in kids. Compound's external breach, per trauma classification, makes 'b' correct.

Correct Answer: D

Rationale: Ribs (1-12) include true (1-7, direct sternal attachment) and false (8-12, indirect or none), forming the cage. Sternum connects ribs, thoracic vertebrae anchor them, costal cartilage links true ribs none encompass both types. Ribs' classification, per thorax, makes 'd' correct.

Correct Answer: B

Rationale: The knee joint, or femorotibial joint, is between the femur and tibia, a hinge for leg movement. Humeroulnar is elbow, coxofemoral is hip, talocrural is ankle. Femorotibial's specificity, per joint nomenclature, makes 'b' correct.

Correct Answer: A

Rationale: An organ, like the stomach, is a collection of similar tissues (e.g., muscle, epithelium) working together for a specific function (digestion). An organelle is a cellular structure (e.g., mitochondria), not tissues. An organism is the whole living entity. An organ system like the digestive system includes multiple organs, broader than one. The organ's tissue-based, functional unity, per anatomical hierarchy, makes 'a' correct.