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 B
Explanation
A. exocytosis: This is the process of expelling material out of the cell, not taking it in.
B. pinocytosis: Pinocytosis is "cell drinking"-the process of engulfing dissolved particles in fluid by invagination of the plasma membrane.
C. cytolysis: Cytolysis refers to cell bursting, not intake of particles.
D. phagocytosis: Phagocytosis is "cell eating", where the cell engulfs large solid particles like bacteria, not liquids.
Correct Answer is B
Explanation
A. Organization:
Refers to the structured arrangement of parts from chemical to system level, not interaction with the environment.
B. Responsiveness:
Responsiveness is the ability to sense changes in the environment and react appropriately to maintain balance (homeostasis).
C. Growth and Development:
Refers to increase in size and complexity over time, not directly about environmental interaction.
D. Metabolism:
Involves internal chemical reactions but not necessarily interaction with external stimuli.
E. Waste Disposal:
A bodily process to remove waste, not primarily about environmental response.
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