What are the first three stages of the human life cycle? Select all that apply.
Childhood
Puberty
Prenatal
Infancy
Toddler
Correct Answer : C,D,E
A. Childhood generally refers to the period after toddlerhood and infancy, typically from ages 3–12. It is not one of the first three stages of the human life cycle.
B. Puberty is a developmental milestone within adolescence and occurs much later in the life cycle. It is not part of the first three stages.
C. The prenatal stage begins at conception and continues until birth. This stage encompasses all development within the womb, including cell division, organ formation, and growth, laying the foundation for life after birth.
D. Infancy follows birth and generally spans from birth to about 12 months. During this stage, rapid growth, motor development, and sensory and cognitive milestones occur.
E. The toddler stage typically covers ages 1–3 years. This stage is marked by increased mobility, language development, social interaction, and early learning experiences.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. While the heart may be affected by severe thiamine deficiency, the lungs are not directly impacted by thiamine status. Lung function is largely independent of thiamine.
B. Thiamine (vitamin B1) is essential for carbohydrate metabolism and energy production in cells, especially in tissues with high metabolic demands. The brain and heart are particularly sensitive to thiamine deficiency because they require constant energy supply to function. Inadequate thiamine can lead to neurological disorders such as Wernicke’s encephalopathy and peripheral neuropathy, as well as cardiovascular complications like beriberi, which can manifest as heart failure or tachycardia.
C. The liver and kidneys play key roles in metabolism and excretion but are not the primary organs affected by thiamine deficiency. They are less sensitive to energy deficits caused by thiamine insufficiency.
D. Muscles and ligaments are involved in movement and support but are not the main organs impacted by thiamine deficiency. Muscle weakness may occur indirectly, but the primary effects are neurological and cardiac.
Correct Answer is A
Explanation
A. Lipids (fats) provide the most energy per gram compared to other macronutrients. They yield approximately 9 kilocalories per gram, making them the most energy-dense nutrient. Lipids are stored in adipose tissue and can be broken down through beta-oxidation and the Krebs cycle to produce ATP, supplying long-term energy for the body.
B. Vitamins do not provide energy directly. They function as coenzymes or cofactors in metabolic reactions that help the body derive energy from macronutrients but do not themselves yield calories.
C. Minerals are inorganic nutrients essential for enzyme function, bone health, fluid balance, and other physiological processes, but they do not provide caloric energy.
D. Water is essential for life, participating in chemical reactions, temperature regulation, and nutrient transport, but it contains no calories and therefore provides no energy.
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