The effect of oxygen deficiency is primarily observed in which organ?

  • A
    Brain
  • B
    Skin
  • C
    Kidney
  • D
    Intestine

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The sympathetic and parasympathetic neural system combines from

What does the $ANS$ (Autonomic Neural System) affect?

What is included in the $PNS$?

Select the correct option:
$(1)$ The cell body contains typical cell organelles and Nissl's granules / neurotransmitters.
$(2)$ The nervous system of Hydra is composed of a nerve net / ganglia.

The major parts of the human neural system are depicted below. Fill in the empty boxes with appropriate words.

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