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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381. The myelin sheath:
- A. Is found in all axons
- B. Is found in all dendrites
- C. Speeds up conduction
- D. Is proteinaceous
Explanation: The myelin sheath acts as an insulator for axons, allowing impulses to jump between nodes (saltatory conduction), which increases the…
Correct answer: Speeds up conduction- A. Sensory
- B. Associative
- C. Motor
- D. Mixed
Explanation: Motor neurons (efferent neurons) carry signals away from the CNS to muscles and glands, controlling voluntary and involuntary movements.
Correct answer: Motor- A. Dendron
- B. Axon
- C. Dendrites
- D. Cell body
Explanation: Extensions of a neuron (axons and dendrites) can regenerate if the cell body is intact, since the nucleus in the cell body directs repair…
Correct answer: Cell body- A. Main nutritional part
- B. It contains axoplasm
- C. Biosynthesis of materials
- D. Regenerate axonal and dendrite fiber
Explanation: The cell body contains the nucleus, mitochondra, Golgi apparatus, and organelles for metabolism and biosynthasis, but axoplasm is specific…
Correct answer: It contains axoplasm- A. Sensory neurons
- B. Associative neurons
- C. Motor neurons
- D. Neuroglial cells
Explanation: Interneurons (associative neurons) are the most abundant. neurons in the CNS.
Correct answer: Associative neurons- A. Dendron
- B. Soma
- C. Dendrites
- D. Axons
Explanation: Dendrites are branch-like extensions from the cell body, resembling a tree. They receive signals from other neurons.
Correct answer: Dendrites- A. Axon
- B. Dendrites
- C. Nissl's granules
- D. Synapse
Explanation: A synapse is the junction between two neurons for signal transmission and is not part of the neuron itself. Axons.
Correct answer: Synapse- A. Cell
- B. Neuron
- C. Nephron
- D. Brain
Explanation: The neuron is the chief structural and functional unit of the nervous system.
Correct answer: Neuron- A. A cell body which contains a nucleus
- B. Presence of Nodes of Ranvier
- C. A thick myelin sheath
- D. Presence of Schwann cells
Explanation: The cell body (soma) is the main nutritional and metabolic center of all neurons, containing the nucleus and responsible for biosynthesis…
Correct answer: A cell body which contains a nucleus- A. Axons
- B. Dendrites
- C. Myelin sheath
- D. Schwann cell
Explanation: Axons are long, thin processes that transmit neural impulses from the cell body to other neurons or effector cells.
Correct answer: Axons- A. Afferent nerve
- B. Brain
- C. Efferent nerve
- D. Effectors
Explanation: A reflex arc consists of receptors, sensory neurons. intermeurons. motor neurons, and effectors.
Correct answer: Brain- A. Receptors and effectors
- B. Receptors, effectors, and spinal cord
- C. Brain, receptors, and spinal cord
- D. Receptors, neurons, and the brain
Explanation: In a reflex action, the stimulus is sansed by receptors, travels via sensory and relay neurons within the spinal cord, and activates the…
Correct answer: Receptors, effectors, and spinal cord- A. Na+ and K+
- B. Ca2+ and Na+
- C. Ca2+ and K+
- D. Na+ and Mg2+
Explanation: Sodium (Na+) and potassium (K+) ions are essential for nerve impulse conduction.
Correct answer: Na+ and K+- A. Synapse
- B. Synaptic cleft
- C. Collapse
- D. Pre-synapse membrane
Explanation: The synaptic cleft is a tiny gap between the presynaptic terminal of one neuron and the postsynaptic membrane of another, where…
Correct answer: Synaptic cleft- A. Action Potential
- B. Resting Potential
- C. Threshold
- D. Recovery Period
Explanation: Threshold is the minimum level of stimulus required for a neuron to generate action potential.
Correct answer: Threshold- A. K+ channels
- B. Na+/K+ pumps
- C. Na+ channels
- D. Ca2+ channels
Explanation: In myelinated neurons, action potentials jump from one node of Ranvier to the next.
Correct answer: Na+/K+ pumps- A. Hyperpolarization
- B. Depolarization
- C. Resting Membrane Potential
- D. Saltatory Conduction
Explanation: In myelinated neurons, action potentials jump from one node of Ranvier to the next.
Correct answer: Saltatory Conduction398. How many sodium ions are pumped out in response to two potassium ions transported into the membrane?
- A. 4
- B. 1
- C. 2
- D. 3
Explanation: The sodium-potassium pump moves 3 Na+ out and 2 K+ in per cycle, maintaining the resting membrane potential (-70 mV) with more positive…
Correct answer: 3- A. Repolarization
- B. Sodium ions forming ionic bonding
- C. The opening of sodium channels/gates
- D. The action of the acetylcholinesterase enzyme
Explanation: Voltage-gated Na channels open during depolarization. allowing sodium ions to flow into the neuron.
Correct answer: The opening of sodium channels/gates- A. Glutamic acid
- B. Acetylcholine
- C. GABA
- D. Dopamine
Explanation: Alzheimer's disease involves degeneration of cholinergic neurons in the brain----> deficiency of acetylcholine----> progressive memory…
Correct answer: Acetylcholine