Free Coordination and Control MCQs with Answers
1,687 Coordination and Control MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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1321. Motor neurons have:
- A. Short axon
- B. Long axon
- C. Long dendrites
- D. Dendron
Explanation: Motor neurons indeed have long axons. These axons enable motor neurons to transmit signals over relatively long distances to the target…
Correct answer: Long axon- A. 2-3 seconds
- B. 2-3 minutes
- C. 2-3 milliseconds
- D. 2-3 microseconds
Explanation: Depolarization takes 1 milisecond. During this phase, the cell's membrane potential briefly becomes more negative than it's resting state…
Correct answer: 2-3 milliseconds- A. Association neurons
- B. Motor neurons
- C. Intermediate neurons
- D. Presynaptic neurons
Explanation: Associative neurons are commonly known by several names, and one of them is "Intermediate neurons".
Correct answer: Intermediate neurons- A. Pons
- B. Medulla oblongata
- C. Cerebellum
- D. Reticular formation
Explanation: The part of the hindbrain responsible for controlling automatic activities such as breathing, swallowing, heart rate, and blood pressure…
Correct answer: Medulla oblongata- A. Membrane potential
- B. Resting membrane potential
- C. Active membrane potential
- D. Electrical potential
Explanation: The net difference of charges between the inner and outer surfaces of a non-conducting neuron is called the "resting membrane potential".
Correct answer: Resting membrane potential1326. It is considered one out of three parts of fore brain and is further sub divided into three parts:
- A. Thalamus
- B. Hypothalamus
- C. Limbic system
- D. Cerebrum
Explanation: The limbic system is considered one out of three parts of the forebrain and is further subdivided into three main components.
Correct answer: Limbic system- A. Polarized state
- B. Depolarized state
- C. Repolarized
- D. Refractory state
Explanation: The part of a neuron that is already in resting potential is also considered to be in a "polarized" state.
Correct answer: Polarized state- A. Sodium and calcium
- B. Sodium and Potassium
- C. Calcium and Potassium
- D. Negative organic ions
Explanation: The most important ions present in neurons and the surrounding fluids are sodium (Na+) and potassium (K+).
Correct answer: Sodium and Potassium- A. Three
- B. Five
- C. Seven
- D. Ten
Explanation: Sodium ions (Na+) are approximately 10 times higher in concentration outside the membrane surface of a nerve cell compared to inside.
Correct answer: Ten- A. Cerebral cortex
- B. Adrenal cortex
- C. Cerebellum
- D. Thalamus
Explanation: The thalamus is connected to the limbic system, which is involved in emotions, memory, and motivation.
Correct answer: Cerebral cortex- A. Mid brain
- B. Medulla
- C. Pons
- D. Cerebellum
Explanation: The cerebellum is a distinct structure located in the posterior part of the brain, positioned behind the brainstem.
Correct answer: Cerebellum- A. White matter
- B. Blue matter
- C. Grey matter
- D. Yellow matter
Explanation: Peripheral part of brain contains grey matter. Gray matter is a type of brain tissue that contains cell bodies, dendrites, and synapses.
Correct answer: Grey matter- A. Endoskeleton
- B. Skull
- C. Cranium
- D. vertebral column
Explanation: The term "cranium" is often used interchangeably with "skull." The cranium is the part of the skull that specifically encloses and…
Correct answer: Cranium- A. There is a high concentration of Na+ ions inside the axons
- B. The nerves contain myelinated fibers
- C. There is a potential difference across; the axon membranes
- D. The cell bodies of the fibers are contain within the dorsal root ganglion
Explanation: In summary, the rapid transmission of nerve impulses in mammalian leg muscles is primarily due to the presence of myelinated fibers in the…
Correct answer: The nerves contain myelinated fibers- A. Medulla oblongata
- B. Cerebrum and medulla
- C. Cerebellum and medulla
- D. Cerebrum and cerebellum
Explanation: All the unconscious activities like heartbeat, involuntary breathing, and gut peristalsis are primarily controlled by the "autonomic…
Correct answer: Medulla oblongata- A. Ventricle
- B. Vertebral canal
- C. Ventral canal
- D. Central canal
Explanation: The central canal is a structure that runs longitudinally through the center of the spinal cord.
Correct answer: Central canal- A. Sodium
- B. Calcium
- C. Chloride
- D. Magnesium
Explanation: A nerve impulse, also known as an action potential, travels through a nerve fiber when its membrane surface becomes more permeable to…
Correct answer: Sodium- A. Repolarization
- B. Action potential
- C. Resting potential
- D. None of the above
Explanation: During an action potential, the sodium-pump (Na+/K+ ATPase) stops operating; because, its activity is overshadowed by the much more rapid…
Correct answer: Action potential- A. Na+ channels are closed and K+ channels are open
- B. Both K+ and Na+ gates are closed
- C. K+ gate closes and Na+ gate opens
- D. Both gates remain open
Explanation: The voltage-gated sodium (Na+) channels that opened during the depolarization phase to allow Na+ ions to enter the cell begin to…
Correct answer: Na+ channels are closed and K+ channels are open- A. Osteocyte
- B. Chromatophor
- C. Neuron
- D. Lymph corpuscle
Explanation: The longest cells in the human body are neurons, specifically the motor neurons.
Correct answer: Neuron