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. occipital lobe
- B. temporal lobe
- C. parietal lobe
- D. frontal lobe
Explanation: The frontal lobes, especially the prefrontal cortex, handle higher mental functions, and damage there famously alters personality.
Correct answer: frontal lobe42. The three membranes that cover and protect the brain and spinal cord are collectively called the
- A. meninges
- B. ventricles
- C. choroid plexuses
- D. myelin layers
Explanation: The dura, arachnoid and pia mater cushion the CNS and enclose the cerebrospinal fluid, and their infection causes meningitis.
Correct answer: meninges43. A drunk person walks unsteadily and cannot coordinate movements because alcohol mainly affects the
- A. medulla oblongata
- B. cerebellum
- C. hypothalamus
- D. pituitary gland
Explanation: The cerebellum fine tunes posture, balance and the timing of voluntary movement, so its depression by alcohol produces staggering and…
Correct answer: cerebellum- A. enzymes that speed up metabolism
- B. waste products of the endocrine glands
- C. chemical messengers carried in the blood to target organs
- D. electrical signals sent along nerves
Explanation: Endocrine glands secrete hormones directly into the blood, which delivers them everywhere, but only cells with the right receptors…
Correct answer: chemical messengers carried in the blood to target organs- A. is the largest endocrine gland
- B. sits outside the brain
- C. secretes digestive enzymes
- D. controls the secretion of several other endocrine glands
Explanation: Pituitary hormones such as TSH and ACTH direct the thyroid and adrenal cortex, and its link with the hypothalamus places it at the top of…
Correct answer: controls the secretion of several other endocrine glands- A. gigantism
- B. dwarfism
- C. cretinism
- D. diabetes
Explanation: Before the bones stop growing, too much growth hormone drives the long bones to extraordinary length, producing gigantism.
Correct answer: gigantism- A. concentration of glucose in the blood
- B. rate of metabolism and heat production of the body
- C. amount of calcium in the bones
- D. volume of urine produced
Explanation: Thyroxine sets the basal metabolic rate of nearly every cell, which is why an overactive thyroid causes weight loss and heat intolerance.
Correct answer: rate of metabolism and heat production of the body- A. sleep and digestion
- B. long term growth
- C. emergency action, the fight or flight response
- D. the production of eggs
Explanation: Adrenaline raises heart rate, blood glucose and blood flow to muscles while slowing digestion, equipping the body for sudden exertion.
Correct answer: emergency action, the fight or flight response- A. insulin
- B. ADH
- C. thyroxine
- D. glucagon
Explanation: Glucagon from the alpha cells of the pancreas converts glycogen back to glucose in the liver, lifting blood sugar between meals.
Correct answer: glucagon- A. +70 mV
- B. -70 mV
- C. 0 mV
- D. -90 mV
Explanation: The resting membrane potential is about -70 mV (inside negative relative to outside), maintained by Na+/K+ pump and K+ leak channels.
Correct answer: -70 mV- A. The axon is myelinated
- B. Of the refractory period
- C. Of the all-or-none law
- D. Sodium channels are everywhere
Explanation: The refractory period (when Na+ channels are inactivated) prevents backward conduction, ensuring unidirectional propagation.
Correct answer: Of the refractory period- A. Increasing axon diameter
- B. Saltatory conduction
- C. Increasing Na+ channels
- D. Decreasing resistance
Explanation: Myelin insulates the axon, allowing action potentials to jump between nodes of Ranvier (saltatory conduction), greatly increasing speed.
Correct answer: Saltatory conduction- A. Diffusion
- B. Exocytosis
- C. Endocytosis
- D. Osmosis
Explanation: Neurotransmitters are released by exocytosis of synaptic vesicles when Ca2+ enters the presynaptic terminal.
Correct answer: Exocytosis- A. Acetylcholinesterase
- B. Monoamine oxidase
- C. COMT
- D. Peptidase
Explanation: Acetylcholinesterase in the synaptic cleft rapidly breaks down acetylcholine to terminate the signal.
Correct answer: Acetylcholinesterase- A. Decreases heart rate
- B. Causes fight-or-flight response
- C. Stimulates digestion
- D. Constricts pupils
Explanation: The sympathetic division mediates fight-or-flight responses: increased heart rate, dilated pupils, inhibited digestion.
Correct answer: Causes fight-or-flight response- A. Glutamate
- B. GABA
- C. Dopamine
- D. Serotonin
Explanation: GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the CNS, causing Cl- influx and hyperpolarization.
Correct answer: GABA- A. Memory
- B. Balance and coordination
- C. Heart rate
- D. Vision
Explanation: The cerebellum coordinates voluntary movements, balance, posture, and motor learning.
Correct answer: Balance and coordination- A. Only the brain
- B. Only the spinal cord
- C. Spinal cord and brain
- D. Receptor, spinal cord, effector
Explanation: A simple reflex arc involves receptor → sensory neuron → spinal cord integration → motor neuron → effector, without brain involvement.
Correct answer: Receptor, spinal cord, effector- A. Serotonin
- B. Dopamine
- C. GABA
- D. Acetylcholine
Explanation: Parkinson's disease results from degeneration of dopaminergic neurons in the substantia nigra, causing tremors and rigidity.
Correct answer: Dopamine- A. Thyroid
- B. Adrenal
- C. Pituitary
- D. Pancreas
Explanation: The pituitary gland is called the master gland because its hormones regulate other endocrine glands.
Correct answer: Pituitary