CLASS 10 SCIENCE CH 7

 

                                                 SCORE CBSE

Chapter 7: Control and Coordination

1. Introduction to Control and Coordination:

• Control: The process of regulating and managing body functions.
• Coordination: The ability of different parts of the body to work together.
• Both control and coordination are essential for the proper functioning of the body.

2. Nervous System:

• The nervous system helps in the coordination of all activities of the body.
• It consists of neurons, which are the functional units of the system.
• The nervous system is divided into:
  • Central Nervous System (CNS): Brain and spinal cord.
  • Peripheral Nervous System (PNS): Nerves that connect the CNS to the body.

3. Neuron Structure:

• A neuron consists of:
  • Cell body: Contains the nucleus.
  • Dendrites: Receive impulses.
  • Axon: Transmits impulses away from the cell body.

4. Nerve Impulse Transmission:

• Nerve impulses are transmitted through a process called electrical impulses.
• The junction between two neurons is called a synapse, where neurotransmitters help in the transmission of the impulse.

5. Reflex Action:

• Reflex action is a quick, involuntary response to a stimulus, such as touching a hot object.
• It involves the spinal cord and is faster than voluntary actions as it bypasses the brain.

6. Endocrine System:

• The endocrine system consists of glands that secrete hormones, which regulate various bodily functions.
• Major glands include:
  • Pituitary gland: Controls other endocrine glands.
  • Thyroid gland: Regulates metabolism.
  • Pancreas: Produces insulin to control blood sugar.
  • Adrenal glands: Release adrenaline during stress.
  • Gonads: Secrete sex hormones (testes in males, ovaries in females).

7. Hormonal Coordination:

• Hormones are chemical messengers that regulate body processes like growth, metabolism, and reproduction.
• The hormones act on specific target organs and tissues to bring about a desired response.

8. Human Brain and Its Functions:

• The human brain is divided into three major parts:
  • Cerebrum: Controls voluntary actions, emotions, and thinking.
  • Cerebellum: Coordinates voluntary movements and balance.
  • Medulla: Controls involuntary actions like breathing and heartbeat.
• The brain processes sensory information and integrates motor responses.

9. Coordination in Plants:

• Plants also exhibit control and coordination through plant hormones:
  • Auxins: Control plant growth.
  • Gibberellins: Promote seed germination and growth.
  • Cytokinins: Stimulate cell division.
  • Ethylene: Regulates fruit ripening.

10. Tropism:

• Tropism is the movement of plants in response to environmental stimuli:
  • Phototropism: Growth of plants towards light.
  • Gravitropism: Growth in response to gravity.

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