Free Receptors MCQs with Answers
33 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.
33 questions · page 4 of 4
31. The hormone that raises the glucose concentration of the blood is
- 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. Insulin does the opposite, and the insulin glucagon pair together keeps glucose within narrow limits.
Correct answer: glucagon32. A reflex arc involves
- 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, effector33. Olfactory receptors are the type of:
- 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 to chemicals and are chemoreceptors, as are the taste buds. Photoreceptors detect light in the retina and mechanoreceptors detect pressure, touch and sound. Classifying a receptor means asking which form of energy or signal it transduces.
Correct answer: chemoreceptors