Free Receptors MCQs with Answers
61 Receptors MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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- 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- 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 lobe24. 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: meninges25. 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. 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. photoreceptors
- B. mechanoreceptors
- C. thermoreceptors
- D. chemoreceptors
Explanation: Smell depends on molecules dissolving in the mucus and binding receptor proteins in the nasal epithelium, so olfactory receptors respond…
Correct answer: chemoreceptors34. _________ is a condition characterized by an abnormal inability to see in dim light or at night.
- A. Nyctalopia
- B. Myopia
- C. Hyperopia
- D. All of the above
Explanation: Nyctalopia, or night blindness, is difficulty seeing in dim light and is commonly associated with inadequate vitamin A or impaired…
Correct answer: Nyctalopia- A. Iris
- B. Pupil
- C. Horoid coat
- D. Ciliary body
Explanation: The iris is a circular muscular diaphragm containing a central opening called the pupil, and it regulates the amount of light entering the…
Correct answer: Iris- A. Chemotropic movement
- B. Chemotactic movement
- C. Chemosastic movement
- D. Haptonastic movement
Explanation: Chemotaxis is the directed movement of a cell in response to a chemical substance, as sperm move toward chemicals released by the ovum.
Correct answer: Chemotactic movement- A. Chemical
- B. Mechanical
- C. Photo
- D. Nociceptors
Explanation: Hearing receptors respond to mechanical vibrations produced by sound waves, so they are mechanoreceptors.
Correct answer: Mechanical- A. Stimulus
- B. Variation
- C. Response
- D. Reaction
Explanation: A stimulus is any detectable change in the internal or external environment, such as light, temperature, pressure, or a chemical change.
Correct answer: Stimulus- A. Receptors
- B. Neurons
- C. Effectors
- D. All of these
Explanation: Receptors detect changes in the environment and convert them into nerve impulses or other signals.
Correct answer: Receptors- A. Kinesis
- B. Taxes
- C. Instinct
- D. Learning
Explanation: Pillbugs respond to humidity by changing the speed of their movement, moving more rapidly in dry conditions and slowing in moist…
Correct answer: Kinesis