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Control and Coordination

Introduction

     As the complexity of the individuals, plants or animals increases the different cells and organs become separated from each other by greater distance.

Nervous System Coordination

     It stores the previous experiences as memory that helps us to think and analyse our reactions.It conducts messages between different parts of the body.

Transmission of Messages

     The messages are transmitted in the form of electrical impulses along the fibres of the neurons.

Receptors and Effectors

     Receptors are structures at the ends of the nerve fibres that collect the information to be conducted by the nerves.

Parts of the Nervous System - Central Nervous System

     The human nervous system can be divided into three main parts:Central nervous system, Peripheral nervous system, Autonomic nervous system.

Parts of the Nervous System - Peripheral Nervous System

     The peripheral nervous system is made up of nerves that connect the different parts of the body (peripheral tissues) to the central nervous system.

Pituitary Gland

     It is made up of three lobes - anterior, middle and posterior. They secrete hormones in response to the secretion of neurohormones by the hypothalamus.

Thymus and Pancreas

     It is a gland that is prominent behind the breastbone in children.It gradually decreases in size in adults.

Adrenal and Gonads

     The adrenal glands are present on top of the kidneys and appear cap-like on top of each kidney. Each adrenal gland has two layers - outer cortex and inner medulla.

Summary

     With increasing complexity, the organisms have had to develop means of control and coordination between the different parts of the body.


Question and Answers

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Multiple Choice Questions

     



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