Homeostasis is the condition in which the body maintains
a static state with no deviation from preset points
a dynamic state within an unlimited range, depending on circumstances
the lowest possible energy usage
a relatively stable internal environment, within limits
The Correct Answer is D
A. A static state with no deviation from preset points: Homeostasis does not mean absolute constancy. The body allows for small fluctuations around set points, so a static state without deviation does not reflect the true nature of homeostasis.
B. A dynamic state within an unlimited range, depending on circumstances: While homeostasis is dynamic, the body maintains stability within narrow physiological ranges. Unlimited variation would disrupt vital functions and lead to imbalance or disease.
C. The lowest possible energy usage: Energy conservation is important, but homeostasis is not defined by minimizing energy use. Instead, it involves active processes, many of which require significant energy to maintain internal balance.
D. A relatively stable internal environment, within limits: Homeostasis is best described as the body’s ability to maintain a stable internal environment despite external changes. This stability is achieved within narrow limits, ensuring proper cellular and systemic function.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Sodium (atomic number 11): Sodium has one electron in its outermost shell, making it highly reactive as it tends to lose that electron to achieve a stable configuration.
B. Neon (atomic number 10): Neon has a full outer electron shell (octet), making it chemically stable and largely unreactive under normal conditions. Its electron configuration prevents it from readily forming chemical bonds.
C. Carbon (atomic number 6): Carbon has four electrons in its outer shell and typically forms covalent bonds to complete its octet, so it is chemically reactive.
D. Oxygen (atomic number 8): Oxygen has six electrons in its outer shell and is highly reactive because it seeks two additional electrons to complete its octet, often forming covalent or ionic bonds.
Correct Answer is D
Explanation
A. Cells: The study of cells specifically is called cytology, not histology. Cytology focuses on the structure, function, and life cycle of individual cells.
B. Cell chemistry: The chemical processes within cells are studied in biochemistry, which examines molecular interactions and metabolic pathways rather than tissue organization.
C. The gross structures of the body: Gross anatomy deals with structures visible to the naked eye, such as organs and organ systems, rather than microscopic structures.
D. Tissues: Histology is the study of tissues, which are groups of similar cells working together to perform specific functions. It examines the microscopic structure and organization of these tissues in the body.
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