MDCAT Coordination and Control MCQs

Sample Coordination and Control MCQs with answers

Try these questions, then open the answer to check your reasoning. Use the quiz above for more topics and a complete review.

1. Receptors

   1. Which sequence will be followed when impulse travels from receptor to effector?

   1. A. Motor neuron → Inter neuron → Sensory neuron
   2. B. Inter neuron → Sensory neuron → Motor neuron
   3. C. Sensory neuron → Inter neuron → Motor neuron
   4. D. Sensory neuron → Motor neuron → Inter neuron
   View answer and explanation

   Answer: C. Sensory neuron → Inter neuron → Motor neuron

   This question tests the sequence of impulse flow in a reflex arc. The impulse travels from the receptor through a sensory neuron to an interneuron in the central nervous system, then through a motor neuron to the effector. Any sequence that reverses or scrambles this order is incorrect.

2. Brain

   2. Action of epinephrine and nor-epinephrine differ on vessels supplying blood to:

   1. A. All parts of body
   2. B. Brain and muscles
   3. C. Skin and gut
   4. D. Skin and muscles
   View answer and explanation

   Answer: C. Skin and gut

   Keyword/Clue: differ on vessels supplying blood to Concept/Formula: Vascular effects depend on adrenergic receptor distribution: norepinephrine acts mainly on \textbf{ $\alpha$ 1} (vasoconstriction), while epinephrine also stimulates \textbf{ $\beta$ 2} (vasodilation in certain beds). Thus, the pattern of response differs by organ (e.g., skin vs splanchnic/gut). Why the Other Options Are Wrong: - Option A: Too nonspecific—responses are not uniform across all vascular beds; they vary with receptor types. - Option B: Brain blood flow is strongly autoregulated and not the classic site emphasized for E vs NE vascular differences. - Option D: Skeletal muscle is a key site where epinephrine can cause \textbf{ $\beta$ 2}-vasodilation, but pairing it with skin makes this option less accurate than the classic contrasting bed skin and gut (splanchnic).

3. Brain

   3. The cerebellum is mainly responsible for:

   1. A. Vision, hearing and reflexes
   2. B. Regulating heart beat only
   3. C. Conscious, thoughts and reasoning
   4. D. Balance, posture and coordination
   View answer and explanation

   Answer: D. Balance, posture and coordination

   The cerebellum plays a crucial role in motor control, specifically in maintaining balance, posture, and coordination of movements. It integrates input from various sensory systems and the spinal cord to fine-tune motor activity. The other options describe functions associated with different parts of the brain: vision and hearing are processed in the occipital and temporal lobes, heart rate regulation is managed by the autonomic nervous system, and conscious thought and reasoning are functions of the cerebral cortex.