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AP Biology Unit 4B: Neural Control & Signal Coordination — practice questions — page 2

Explore 60 free Unit 4B: Neural Control & Signal Coordination questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 4B: Neural Control & Signal Coordination questions and exercises with answers

Showing questions 31–60 of 60.

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 →The gaps between two adjacent myelin sheaths along an axon are calledRead the answer and worked solution →Myelin sheath around an axon is formed byRead the answer and worked solution →Myelinated nerve fibres are typically found inRead the answer and worked solution →A neuron with one axon and one dendrite, found in the retina of the eye, isRead the answer and worked solution →A neuron with one axon and two or more dendrites is calledRead the answer and worked solution →A unipolar neuron, with a cell body and one axon only, is usually foundRead the answer and worked solution →Chemicals released to carry a signal across a synapse are calledRead the answer and worked solution →The unmyelinated nerve fibre is commonly found inRead the answer and worked solution →Insulin is secreted by which cells of the Islets of Langerhans?Read the answer and worked solution →Glucagon acts mainly on which cells?Read the answer and worked solution →Glucagon is described as a hormone that isRead the answer and worked solution →Parathyroid hormone acts on blood calcium byRead the answer and worked solution →Thyrocalcitonin, which regulates blood calcium, is secreted by theRead the answer and worked solution →How many parathyroid glands are present in humans?Read the answer and worked solution →Melatonin, which helps regulate the daily rhythm of the body, is secreted by theRead the answer and worked solution →Thymosins, which act on the immune system, are secreted by theRead the answer and worked solution →Which gland makes it?Read the answer and worked solution →Judge the nerve fibre claimsRead the answer and worked solution →True or false: the hormonesRead the answer and worked solution →Judge the hormone claimsRead the answer and worked solution →Sort the neuron by its shapeRead the answer and worked solution →Complete the blood sugar loopRead the answer and worked solution →Tap the one that does not fitRead the answer and worked solution →

Worked practice questions

The 'fight-or-flight' response is primarily mediated by the:

  1. Sympathetic nervous system + norepinephrine
  2. Parasympathetic nervous system + acetylcholine
  3. Enteric nervous system + serotonin
  4. Somatic nervous system + dopamine
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Correct answer: A. Sympathetic nervous system + norepinephrine

**SYMPATHETIC ANS releases norepinephrine:** ↑ heart rate, dilates pupils, breaks down glycogen, dilates bronchi, inhibits digestion. Prepares body for 'fight or flight'. **PARASYMPATHETIC:** opposite, 'rest + digest'.

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In the retina of the human eye, the COLOUR + sharp daylight vision is mediated by:

  1. Rods (for low-light black-and-white vision)
  2. Cornea (the outer transparent layer)
  3. Cones (for daylight + colour vision)
  4. Iris (controls pupil aperture only)
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Correct answer: C. Cones (for daylight + colour vision)

**CONES:** photoreceptors for colour + sharp vision concentrated in the fovea. **RODS:** more sensitive, low-light + black-white. **Humans have 3 cone types:** red, green, blue sensitive. Colour blindness = defective cone.

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PARKINSON'S DISEASE is caused primarily by:

  1. Excess serotonin in the brain
  2. Deficiency of dopamine in substantia nigra
  3. Autoimmune attack on myelin sheaths
  4. β-amyloid plaque buildup in cortex
Show answer and solution

Correct answer: B. Deficiency of dopamine in substantia nigra

**PARKINSON'S:** degeneration of dopaminergic neurons in the SUBSTANTIA NIGRA → dopamine deficiency → tremors, rigidity, slow movement. **Treatment:** L-DOPA (precursor of dopamine). Alzheimer's: β-amyloid. **MS:** autoimmune attack on myelin.

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