The four most abundant elements in the human body are:
Chlorine, Carbon, Oxygen, Hydrogen
Oxygen, Calcium, Sulfur, Phosphorus
Sodium, Potassium, Calcium, Iron
Oxygen, Carbon, Hydrogen, Nitrogen
The Correct Answer is D
A. Chlorine, Carbon, Oxygen, Hydrogen: Chlorine is present in the body but is not among the four most abundant elements by mass/number compared with nitrogen.
B. Oxygen, Calcium, Sulfur, Phosphorus: Calcium and phosphorus are important (bones), but sulfur is less abundant than carbon and nitrogen; this set does not list the top four.
C. Sodium, Potassium, Calcium, Iron: These are essential electrolytes and trace elements but are not the four most abundant elements overall.
D. Oxygen, Carbon, Hydrogen, Nitrogen: These four elements (O, C, H, N) constitute the majority of the body’s mass and are the most abundant elements in human tissues.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Anaphase: Anaphase is a stage of mitosis when sister chromatids separate and move to opposite poles, not when DNA is replicated.
B. Mitosis: Mitosis is the process of nuclear division; DNA replication occurs before mitosis, not during it.
C. Cytokinesis: Cytokinesis is the division of the cytoplasm following mitosis and does not involve DNA replication.
D. Interphase: Interphase (specifically the S phase) is when DNA replication occurs prior to mitosis.
Correct Answer is B
Explanation
A. Muscle: Muscle tissue composes organs that generate force and movement, not the skin’s outermost layer.
B. Epithelial: The epidermis is made of stratified squamous epithelial cells and forms the skin’s outer layer.
C. Nervous: Nervous tissue (sensory nerve endings) is present in skin but is not the tissue that forms the outer surface.
D. Connective: The dermis is connective tissue beneath the epidermis and supports the outer layer, but it is not the outermost tissue.
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