Master NEET Zoology with topic-wise questions. Tailored for NEET students, these questions strengthen your Biology preparation.
Chronic cocaine use can lead to downregulation of which specific dopamine receptors, contributing to the development of tolerance and withdrawal symptoms?
D1 receptors
D2 receptors
D3 receptors
D4 receptors
During strenuous exercise, the primary stimulus for increased ventilation is:
Decreased in arterial blood
Increased and decreased pH in the cerebrospinal fluid
Increased lactic acid concentration in muscles
Decreased in the cerebrospinal fluid
A mountain climber at high altitude experiences an increase in ventilation rate. This increase is PRIMARILY driven by:
Central chemoreceptors detecting low
Peripheral chemoreceptors detecting low
Increased cerebrospinal fluid pH
Decreased metabolic rate
In individuals with chronic obstructive pulmonary disease (COPD), the primary drive for respiration shifts from levels to:
pH levels
levels
Lactic acid levels
Body temperature
What happens to the rate of respiration when carbon dioxide levels in the blood increase?
Decreases
Remains the same
Increases
Stops completely
During exercise, the primary stimulus for increased respiration is:
Decreased oxygen levels
Increased carbon dioxide levels
Increased lactic acid levels
Decreased blood pH
A decrease in blood pH would primarily stimulate which receptors to increase ventilation?
Peripheral chemoreceptors only
Central chemoreceptors only
Peripheral and central chemoreceptors
Mechanoreceptors in the lungs
A research study investigates the effects of a new drug on micturition. The drug is found to block the M3 muscarinic receptors in the bladder. What is the MOST likely effect of this drug on micturition?
Increased bladder capacity
Inhibition of detrusor muscle contraction
Relaxation of the internal urethral sphincter
Increased urinary frequency
What is the primary stimulus for the initiation of the micturition reflex?
Increased blood pressure
Decreased blood pressure
Stretching of the bladder wall
Hormonal stimulation
A patient presents with muscle weakness and fatigue, particularly affecting the eyelids and extraocular muscles. Repetitive nerve stimulation studies show a decrement in muscle response. Which receptor is MOST directly affected in this condition?
Muscarinic acetylcholine receptor
Beta-adrenergic receptor
Nicotinic acetylcholine receptor
Alpha-adrenergic receptor
