A researcher discovered a sensory receptor that detects decreasing oxygen concentrations in the blood. According to the principles of negative feedback, it is likely that stimulation of this sensory receptor will produce which of the following response(s)?
a decrease in heart rate
an increase in the respiratory rate
a decrease in the respiratory rate
A and C
A and B
The Correct Answer is B
A. a decrease in heart rate: Low oxygen usually triggers the body to increase heart rate to deliver more oxygen-not decrease it.
B. an increase in the respiratory rate: In negative feedback, low oxygen stimulates chemoreceptors which trigger an increase in respiratory rate to bring in more oxygen.
C. a decrease in the respiratory rate: This would worsen the low oxygen state, and is contrary to how the body responds.
D. A and C: Both options are inappropriate responses to low oxygen levels.
E. A and B: While B is correct, A is not, so this combination is also incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. flagella: Flagella are for cell movement (e.g., sperm), not absorption.
B. cilia: Cilia move fluid or particles across cell surfaces (e.g., respiratory tract), not primarily for absorption.
C. microvilli: Microvilli are tiny projections on intestinal cells that increase surface area for nutrient absorption.
D. spindle fibers: Spindle fibers are used during cell division (mitosis), not absorption.
Correct Answer is D
Explanation
A. quaternary: Quaternary structure involves the interaction of multiple polypeptide chains, not folding of a single chain.
B. primary: Primary structure is the linear sequence of amino acids.
C. secondary: Secondary structure includes alpha helices and beta-pleated sheets, but not their 3D folding.
D. tertiary: Tertiary structure is the 3D shape formed by the folding of secondary structures, stabilized by hydrogen, ionic, and disulfide bonds.
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