JAC Class 10 Science Notes Chapter 7 Control and Coordination

Students must go through these JAC Class 10 Science Notes Chapter 7 Control and Coordination to get a clear insight into all the important concepts.

JAC Board Class 10 Science Notes Chapter 7 Control and Coordination

→ The movement is shown as a response to a change in the environment by the organism.

→ Each kind of a change in the environment evokes an appropriate movement as a response.

→ Some movements are growth related while others are not.

→ Nervous system and hormones bring about control and coordination of the bodies.

→ Neuron is a structural and functional unit of nervous tissue.

→ Cell body (cyton), dendrites and axon are the structural parts of neuron.

→ The responses of the nervous system can be classified as reflex action, voluntary action and involuntary action.

JAC Class 10 Science Notes Chapter 7 Control and Coordination

→ Reflex action is an involuntary response to external stimuli without the knowledge of voluntary centres of brain.

→ Reflex arc is a connection between the input (sensory) nerve and the output (motor) nerve along with spinal cord.

→ Voluntary actions occur under the control of will of an animal.

→ The nervous system uses electrical impulses to transmit messages.

→ Human nervous system :

  • Central nervous system is made-up of brain and spinal cord.
  • Peripheral nervous system is made-up of cranial nerves and spinal nerves.

Brain has three major parts:

  • Fore-brain
  • mid-brain and
  • hind-brain.

→ Brain is protected in bony box and spinal cord is protected in a vertebral column.

→ The simplest form of movement at the cellular level is the movement of muscle cell.

→ Plants have neither a nervous system nor muscles.

→ Plants show two different types of movements – one dependent on growth and other independent of growth.

→ Touch-me-not is a plant of the Mimosa family whose leaves move very quickly in response to touch.

→ Tendrils of a pea plant are sensitive to touch.

JAC Class 10 Science Notes Chapter 7 Control and Coordination

→ Environmental factors such as light, gravity, water, etc. change the directions of growing part of a plant. These are called directional or tropic movements.

→ Chemical coordination is seen in both plants and animals.

→ Auxin, gibberellin and cytokinin are growth promoting hormones of plants. Abscisic acid is a plant hormone which inhibits growth.

→ In animals the chemical coordination is due to neurotransmitters and hormones.

→ An endocrine gland is the ductless gland that secretes hormones.

→ Hormones are directly poured into blood and are transported to their functional site.

→ Pituitary gland, pineal gland, thyroid gland, parathyroid gland, thymus gland, adrenal gland, pancreas and testis or ovary are endocrine glands in human body.

→ The timing and amount of hormone secretion are regulated by feedback mechanisms.

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