Which of the following is NOT connective tissue?

Correct Answer: D

Rationale: Skeletal muscle is a type of muscle tissue, not connective tissue, which includes bone, cartilage, and blood.

Correct Answer: B

Rationale: Plasma specific gravity (~1.025) is primarily due to proteins (e.g., albumin), not electrolytes.

Correct Answer: C

Rationale: Thrombin (from prothrombin) cleaves fibrinogen, and fibrin monomers polymerize to form clots; heparin inhibits thrombin.

Correct Answer: A

Rationale: B12 absorption occurs in the ileum; deficiency causes megaloblastic anemia (large RBCs), not small.

Correct Answer: A

Rationale: Muscle biopsy reveals low K+; GI losses (e.g., diarrhea) deplete K+; it reduces muscle activity.