The four elements that make up about 96% of the human body are
hydrogen, carbon, potassium, nitrogen
carbon, nitrogen, oxygen, hydrogen
phosphorus, calcium, nitrogen, hydrogen
calcium, helium, oxygen, nitrogen
The Correct Answer is B
A. Hydrogen, carbon, potassium, nitrogen: While hydrogen, carbon, and nitrogen are major elements in the human body, potassium is a trace element and does not contribute significantly to the 96% composition.
B. Carbon, nitrogen, oxygen, hydrogen: These four elements constitute approximately 96% of the human body. They form the building blocks of organic molecules such as proteins, carbohydrates, lipids, and nucleic acids, making them essential for life.
C. Phosphorus, calcium, nitrogen, hydrogen: Phosphorus and calcium are important elements, particularly in bones and energy molecules, but they are present in much smaller amounts compared to carbon, hydrogen, oxygen, and nitrogen.
D. Calcium, helium, oxygen, nitrogen: Helium is not a biological element in the human body, and while calcium, oxygen, and nitrogen are present, this set does not reflect the four major elements that make up 96% of body composition.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Cardiovascular anatomy: This refers to the structure of the heart and blood vessels, including their size, shape, and location, but does not describe their function.
B. Systemic physiology: Systemic physiology studies the functions of organ systems throughout the body in general, not specifically the heart and blood vessels.
C. Systemic anatomy: Systemic anatomy focuses on the structural organization of entire organ systems, without addressing how they function.
D. Cardiovascular physiology: Cardiovascular physiology examines how the heart and blood vessels work together to circulate blood, deliver oxygen and nutrients, and maintain blood pressure.
Correct Answer is B
Explanation
A. Molecular weight of a substance does not affect the rate: The molecular weight affects diffusion because larger molecules move more slowly than smaller ones. Heavier molecules have lower kinetic energy at a given temperature, which slows their movement across membranes.
B. The greater the concentration gradient, the faster the rate: Net diffusion is directly influenced by the difference in concentration between two areas. A steeper concentration gradient increases the driving force for molecules to move, resulting in a faster diffusion rate.
C. The rate is independent of temperature: Temperature affects diffusion because higher temperatures increase the kinetic energy of molecules, making them move faster. Therefore, diffusion rates are not independent of temperature.
D. The lower the temperature, the faster the rate: Lower temperatures reduce molecular motion and kinetic energy, which slows diffusion. Faster diffusion occurs at higher temperatures rather than lower ones.
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