One of the functional characteristics of life is excitability or responsiveness. This refers to ______
the nervous system causing all living things to sometimes experience anger
indigestible food residues stimulating the excretory system
sensing changes in the environment and then reacting or responding to them
the necessity for all organisms to reproduce
The Correct Answer is C
A. The nervous system causing all living things to sometimes experience anger: Excitability or responsiveness is not related to emotions such as anger. It is a fundamental property of cells and organisms that allows them to detect and respond to stimuli.
B. Indigestible food residues stimulating the excretory system: This describes elimination, a separate functional characteristic of life. Responsiveness is about detecting and reacting to internal or external environmental changes, not the disposal of waste products.
C. Sensing changes in the environment and then reacting or responding to them: Responsiveness refers to the ability of organisms to detect stimuli, such as changes in temperature, light, or internal conditions, and to respond in ways that maintain survival and homeostasis.
D. The necessity for all organisms to reproduce: Reproduction is an essential functional characteristic of life, but it is distinct from responsiveness. It ensures continuation of the species, while responsiveness deals with immediate reactions to environmental changes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Enzyme's active site: The active site of an enzyme has a specific shape and chemical environment that matches the substrate, allowing the enzyme to bind only particular molecules and catalyze a specific chemical reaction efficiently.
B. Product: The product is the result of the reaction, not what determines the enzyme’s specificity. The enzyme’s structure dictates which substrate it can bind.
C. Enzyme-substrate complex: The enzyme-substrate complex forms after the substrate binds to the enzyme’s active site; it is a step in the reaction, not the determinant of specificity.
D. None of the above are correct, because enzymes are not specific: Enzymes are highly specific, with each enzyme typically catalyzing only one type of chemical reaction.
Correct Answer is A
Explanation
A. Diaphragm: The diaphragm is a dome-shaped sheet of muscle that physically separates the thoracic cavity from the abdominopelvic cavity. It also plays a key role in breathing by contracting and relaxing to change thoracic volume during respiration.
B. Liver: The liver is a large organ located in the upper right portion of the abdominal cavity. While it sits just below the diaphragm, it does not form a dividing structure between the thoracic and abdominopelvic cavities.
C. Pelvis: The pelvis forms the lower part of the trunk, providing structural support and housing parts of the urinary and reproductive systems. It does not serve as a boundary between the thoracic and abdominopelvic cavities.
D. Colon: The colon is part of the large intestine that runs within the abdominopelvic cavity. It does not have any structural role in separating body cavities, as it is entirely contained within the lower cavity.
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