The mitochondrion is an example of a(an)

Correct Answer: B

Rationale: The mitochondrion, a cell's energy producer, is an organelle, not an organ (A, tissue group), cell (C, whole unit), or tissue (D, cell group). Organelles are anatomy's intracellular specialists, and mitochondria's role in ATP synthesis exemplifies their functional importance, making B correct.

Correct Answer: D

Rationale: Muscles are deep (beneath) the skin, which is superficial (surface). They're not lateral (A, side), superficial, or superior (C, above). Depth terms in anatomy clarify layering, like muscles under skin, essential for understanding body structure.

Correct Answer: C

Rationale: Axillary refers to the armpit, not acromial (A, shoulder), brachial (B, arm), or sternal (D, chest). Anatomical terms like axillary pinpoint regions, vital for procedures like lymph node checks, confirming C.

Correct Answer: D

Rationale: The sagittal plane divides left and right (e.g., midsagittal at midline), unlike coronal/frontal (A, B, front-back), or transverse (C, top-bottom). Anatomical planes standardize sectioning, vital for imaging like MRI, confirming D.

Correct Answer: A

Rationale: The diaphragm, a muscular sheet, separates thoracic (chest) and abdominopelvic cavities, unlike mediastinum (B, chest divider), sternum (C, breastbone), or ventral cavity (D, broader). Anatomically, it regulates breathing and cavity distinction, confirming A.