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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- A. Increased heart rate
- B. Conversion of glycogen to glucose in the liver
- C. Dilation of the bronchioles
- D. Increased peristalsis and secretion in the gut
Explanation: Adrenaline prepares the body for fight or flight, so it diverts blood and resources to the heart, muscles and lungs and slows digestion…
Correct answer: Increased peristalsis and secretion in the gut- A. photoreceptors
- B. thermoreceptors
- C. chemoreceptors
- D. mechanoreceptors
Explanation: Thermoreceptors in the skin and hypothalamus detect heat and cold and feed the thermoregulatory centre.
Correct answer: photoreceptors- A. retina
- B. iris
- C. lens
- D. cornea
Explanation: Muscles of the iris widen or narrow the pupil, letting more light in during darkness and less in bright sun.
Correct answer: iris- A. rods
- B. bipolar cells
- C. cones
- D. ganglion cells
Explanation: Cones, concentrated in the fovea, work in bright light and distinguish colours in three types.
Correct answer: cones- A. cochlea of the inner ear
- B. eardrum
- C. auditory canal
- D. semicircular canals of the inner ear
Explanation: The three semicircular canals, set at right angles, contain fluid that moves when the head turns, stimulating hair cells that report…
Correct answer: semicircular canals of the inner ear- A. mechanoreceptors
- B. chemoreceptors
- C. photoreceptors
- D. thermoreceptors
Explanation: Taste buds and the olfactory epithelium respond to dissolved or volatile chemicals, which is the defining feature of chemoreceptors.
Correct answer: chemoreceptors- A. the optic nerve leaves the retina and no photoreceptors are present
- B. the lens focuses light most sharply
- C. the iris meets the cornea
- D. rods are most densely packed
Explanation: At the optic disc the axons of ganglion cells gather to form the optic nerve, leaving no space for rods or cones, so light falling there…
Correct answer: the optic nerve leaves the retina and no photoreceptors are present- A. motor neurons
- B. interneurons
- C. sensory neurons
- D. glial cells
Explanation: Sensory, or afferent, neurons bring information in from receptors, while motor neurons carry commands out to effectors.
Correct answer: sensory neurons- A. astrocytes
- B. microglia
- C. ependymal cells
- D. Schwann cells
Explanation: Schwann cells wrap themselves repeatedly around the axon, their membranes forming the insulating myelin.
Correct answer: Schwann cells- A. nodes of Ranvier
- B. synaptic clefts
- C. dendritic spines
- D. neurofibril nodes
Explanation: At the nodes the axon membrane is exposed and rich in ion channels, so the action potential jumps from node to node in saltatory…
Correct answer: nodes of Ranvier31. The minimum strength of stimulus needed to generate an action potential in a neuron is called the
- A. refractory value
- B. threshold
- C. resting potential
- D. summit potential
Explanation: A stimulus below threshold opens too few sodium channels to trigger the positive feedback of depolarisation, so nothing happens; at…
Correct answer: threshold- A. axon to dendrite to cell body
- B. cell body to dendrite to axon
- C. dendrite to cell body to axon
- D. axon to cell body to dendrite
Explanation: Dendrites receive signals and conduct them to the cell body, and the axon carries the impulse away to the terminals.
Correct answer: dendrite to cell body to axon- A. Acetylcholine
- B. Noradrenaline
- C. Dopamine
- D. GABA
Explanation: GABA, gamma aminobutyric acid, hyperpolarises the postsynaptic membrane and calms neural activity, and many sedatives enhance its action.
Correct answer: GABA- A. conditioned reflex
- B. unconditioned reflex
- C. voluntary action
- D. hormonal response
Explanation: Pavlov paired the neutral bell with food until the bell alone triggered salivation, building a reflex through experience in the cerebral…
Correct answer: conditioned reflex- A. spinal reflex
- B. cranial reflex
- C. conditioned reflex
- D. hormonal reflex
Explanation: The reflex arc passes through the brain stem rather than the spinal cord, so it is classed as a cranial reflex.
Correct answer: cranial reflex- A. interneuron
- B. sensory receptor
- C. effector such as a muscle or gland
- D. association area
Explanation: The effector, a muscle or gland, carries out the response, completing the receptor to effector pathway.
Correct answer: effector such as a muscle or gland- A. dorsal root ganglion
- B. white matter of the spinal cord
- C. cerebral cortex
- D. grey matter of the spinal cord
Explanation: Interneurons sit in the grey matter of the cord, where they synapse with the incoming sensory fibre and the outgoing motor neuron.
Correct answer: grey matter of the spinal cord- A. a reflex action
- B. a conditioned response
- C. a voluntary movement
- D. a hormonal effect
Explanation: The pupil reflex is automatic, rapid and involuntary, integrated in the brain stem, meeting every criterion of a reflex.
Correct answer: a reflex action- A. cerebellum
- B. pons
- C. thalamus
- D. hypothalamus
Explanation: The pons, whose name means bridge, connects the cerebrum and cerebellum with the medulla and contains centres that smooth the breathing…
Correct answer: pons- A. cerebrum
- B. cerebellum
- C. midbrain
- D. medulla oblongata
Explanation: The midbrain receives input from the eyes and ears and coordinates these quick orienting reflexes.
Correct answer: midbrain