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Action Caused by the Nervous Tissue

The function of the nervous tissue is the communication between parts of the body. It is composed of neurons which transmit impulses. Nerve cells are functionally connected to each other at a junction known as a synapse, where the terminal branches of an axon and the dendrites of another neuron lie in close proximity to each other but normally without direct contact. Information is transmitted across the gap by chemical secretions called neurotransmitters. It causes activation in the post-synaptic cell.

Protection of Tissues
As the CNS is so important and cannot repair itself easily, it is very well-protected. The brain and spinal cord are more protected than any other organs in the body. The main protecting part is the bone of the skull and vertebra which makes a hard, tough physical barrier to protect the brain and spinal cord from injury.

Just below the bone is a fluid filled space to provide shock absorbance. When an injury to the CNS does occur, the bone of the skull and vertebra become a barrier to the soft tissues of the brain and spinal cord, which swell after an injury.
  • The neuron is made of dendron, cyton and axon
  • Reflex action links stimulus to response and is mediated by a reflex arc
  • The human brain can be divided into forebrain, midbrain and hind brain
  • The movement of the plant shoot towards light is phototropism
  • The movement of the plant root towards gravity is geotropism
  • The major glands in human are the pituitary, thyroid, parathyroid, adrenal, pineal gland, ovaries and the testes.

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