Generally, what is the result of the negative feedback process?
to keep the body's blood sugar level high
to regulate excretion via the kidneys
to control body movement
to maintain homeostasis
The Correct Answer is D
A. To keep the body's blood sugar level high: Negative feedback does not aim to maintain a specific high level of blood sugar. Instead, it responds to deviations from a set point, whether high or low, to restore balance.
B. To regulate excretion via the kidneys: While kidney function can be influenced by negative feedback mechanisms, this is a specific example rather than the overall result of negative feedback in the body.
C. To control body movement: Body movement is largely coordinated by the nervous and muscular systems. Negative feedback primarily regulates physiological variables rather than directly controlling voluntary movement.
D. To maintain homeostasis: Negative feedback mechanisms counteract changes in the body’s internal environment, returning physiological variables to their set points. This constant regulation helps maintain stable conditions necessary for survival.
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Related Questions
Correct Answer is C
Explanation
A. Addition of a water molecule between each two units: Adding water breaks bonds during hydrolysis, so this process does not synthesize carbohydrates or proteins but rather breaks them down.
B. Removal of a carbon atom between each two units: Synthesis does not involve removing carbon atoms. The carbon skeleton of monomers remains intact when forming polymers.
C. Removal of a water molecule between each two units: Condensation (or dehydration) reactions synthesize carbohydrates and proteins by linking monomers. Each bond formation releases a water molecule, connecting sugars into polysaccharides or amino acids into polypeptides.
D. Addition of a carbon atom between each two units: Carbon atoms are not added during polymerization; the existing carbon atoms in monomers are used to form the polymer chain.
Correct Answer is C
Explanation
A. Synthesize proteins for use outside the cell: Proteins for secretion outside the cell are synthesized by ribosomes on the rough endoplasmic reticulum. While mitochondria produce some of their own proteins, they are primarily for internal use in energy metabolism.
B. Are single-membrane structures involved in the breakdown of ATP: Mitochondria are double-membrane organelles, not single-membrane. Their role is to generate ATP through oxidative phosphorylation, not to break it down.
C. Contain their own DNA and RNA codes necessary for their function: Mitochondria possess their own circular DNA and ribosomes, allowing them to produce some proteins and enzymes needed for oxidative phosphorylation.
D. Contain digestive enzymes called acid hydrolases: Acid hydrolases are found in lysosomes, where they break down waste and cellular debris. Mitochondria specialize in energy production, not intracellular digestion.
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