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Kerala DHSE Plus One Neural Control and Chemical Coordination — practice questions

Explore 50 free Neural Control and Chemical Coordination questions in Kerala DHSE Plus One Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Neural Control and Chemical Coordination questions and exercises with answers

Showing questions 1–30 of 50.

The resting membrane potential of a typical neuron is approximatelyRead the answer and worked solution →The rapid depolarisation phase of an action potential is caused byRead the answer and worked solution →Signals between two neurons across a chemical synapse are transmitted byRead the answer and worked solution →The neurotransmitter released at the NEUROMUSCULAR JUNCTION is:Read the answer and worked solution →The cerebral lobe primarily responsible for VISION is the:Read the answer and worked solution →The 'fight-or-flight' response is primarily mediated by the:Read the answer and worked solution →In the retina of the human eye, the COLOUR + sharp daylight vision is mediated by:Read the answer and worked solution →PARKINSON'S DISEASE is caused primarily by:Read the answer and worked solution →Match each hormone to its source gland.Read the answer and worked solution →Flip pairs — match cranial nerve to function.Read the answer and worked solution →NEET · Biology · Hormone ↔ GlandRead the answer and worked solution →NEET · Biology · Endocrine or Exocrine GlandRead the answer and worked solution →Endocrine glands lack ducts and are therefore called:Read the answer and worked solution →Which two systems jointly coordinate and regulate the physiological functions of the body?Read the answer and worked solution →Which cells of the pancreas secrete insulin?Read the answer and worked solution →Which cells of the pancreas secrete glucagon?Read the answer and worked solution →Deficiency of iodine in the diet leads to hypothyroidism and which condition?Read the answer and worked solution →Melatonin plays an important role in regulating a rhythm of what length?Read the answer and worked solution →Hormones from the hypothalamus fall into releasing hormones and which other type?Read the answer and worked solution →Oxytocin and vasopressin are stored and released by which part of the pituitary?Read the answer and worked solution →Over-secretion of growth hormone leads to which condition?Read the answer and worked solution →Excess growth hormone in middle-aged adults results in which condition?Read the answer and worked solution →Glucagon acts mainly on which cells of the body?Read the answer and worked solution →Which thyroid hormone regulates blood calcium by decreasing it?Read the answer and worked solution →Parathyroid hormone is described as which kind of hormone?Read the answer and worked solution →Adrenaline and noradrenaline are known by which name because of when they are released?Read the answer and worked solution →Underproduction of adrenal cortex hormones leads to which named disease?Read the answer and worked solution →Which corticoids regulate the balance of water and electrolytes in the body?Read the answer and worked solution →Which hormone secreted by the atrial wall of the heart decreases blood pressure?Read the answer and worked solution →Which hormone produced by the kidney stimulates the formation of red blood cells?Read the answer and worked solution →

Worked practice questions

The resting membrane potential of a typical neuron is approximately

  1. +70 mV
  2. +30 mV
  3. 0 mV
  4. −70 mV
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Correct answer: D. −70 mV

About −70 mV (inside negative relative to outside). Maintained by the Na⁺/K⁺ pump and the membrane's selective K⁺ permeability.

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The rapid depolarisation phase of an action potential is caused by

  1. K⁺ flowing out of the cell
  2. Na⁺ rushing into the cell through voltage-gated channels
  3. Cl⁻ flowing into the cell
  4. active pumping of Na⁺ out
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Correct answer: B. Na⁺ rushing into the cell through voltage-gated channels

Voltage-gated Na⁺ channels open when the membrane is depolarised to threshold. Na⁺ floods in, driving the membrane potential to about +30 mV — the upstroke of the action potential.

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Signals between two neurons across a chemical synapse are transmitted by

  1. direct electrical contact
  2. neurotransmitters released into the synaptic cleft
  3. diffusion of Na⁺ ions
  4. passive heat exchange
Show answer and solution

Correct answer: B. neurotransmitters released into the synaptic cleft

The action potential triggers vesicles in the axon terminal to release neurotransmitter into the cleft. The neurotransmitter diffuses to receptors on the next neuron, generating a postsynaptic potential.

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