Which of the following structures controls respirations?
Cerebellum
Medulla oblongata
Hypothalamus
Cerebrum
The Correct Answer is B
A. Cerebellum: The cerebellum coordinates movement and balance, not respiration.
B. Medulla oblongata: The medulla controls the rate and depth of breathing by monitoring CO₂ and pH levels.
C. Hypothalamus: The hypothalamus regulates homeostasis and emotions, not directly breathing.
D. Cerebrum: The cerebrum controls voluntary actions and higher-level thinking, not automatic respiration.
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Related Questions
Correct Answer is A
Explanation
A. CO₂: High CO₂ (hypercapnia) stimulates the respiratory center to increase breathing.
B. Volume: Blood volume doesn't directly affect respiratory rate.
C. Bilirubin: This is associated with liver function and jaundice, not respiration.
D. Calcium: Calcium levels affect muscle function, not the breathing rate directly.
Correct Answer is D
Explanation
A. Osmosis: Osmosis refers to the movement of water across a membrane, not gases.
B. Active transport pump: Gas exchange does not require energy; it is a passive process, not active transport.
C. Filtration: Filtration is driven by hydrostatic pressure and is more relevant to kidneys and capillary exchange of fluids.
D. Diffusion: Diffusion is the passive movement of gases from an area of higher concentration to an area of lower concentration-how O₂ and CO₂ exchange occurs across the alveolar-capillary membrane.
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