Coordination, form 3 biology, topic 3, Dr. Mlelwa

Coordination is the working together of the various organs of an organism in a systematic manner so as to produce a proper response to the stimuli. Without coordination the body becomes disorderly and it may fail to function properly.

Advanced 0(0 Ratings) 4 Students enrolled English-and-swahili
Created by Dr. Mlelwa
Last updated Mon, 27-Nov-2023
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Course overview
The coordination in simple multicellular animals takes place through nervous system only. The control and coordination in higher animals called vertebrates (including human beings) takes place through nervous system as well as hormonal system called endocrinesystem. Coordination in plants is under the control of hormones.
All the living organisms (plants and animals) respond and react to changes in the environment around them. The changes in the environment to which the organisms respond and react are called stimuli (singular: stimulus). The living organisms show response to stimuli such as light, heat, cold, sound, smell, taste, touch, pressure, pain,water, and force of gravity, etc. The ability to perceive, interpret and respond to stimuli is called irritability or sensitivity.
There are two types of stimuli: external and internal. External stimuli are associated with the surrounding environment such as wind temperature, light, pressure, touch, water and gravity. Internal stimuli occur within the organism, for example, a decrease or an increase in the amount of water and glucose in the blood.
When an organism detects a stimulus, it initiates a response. A response is a behavioural,physiological or muscular activity initiated by a stimulus. For example, if a man touches a very hot utensil accidentally, he quickly pulls his hand away from the hot utensil. Here,heat is the stimulus and the man reacts (responds) by moving his hand away from the hot utensil. Similarly, when the sun is bright, we close our eyes. In this case, light is the stimulus and we react by closing our eyes. Likewise, when the amount of water in the blood drops, the pituitary gland secretes an anti-diuretic hormone (ADH) which stimulates the reabsorption of water in the kidneys.

What will i learn?

  • In this topic you will learn about concept of coordination, nervous coordination in humans, sense organs, drugs and drug abuse in relation to nervous coordination, and coordination in plants.
Requirements
  • silent room for studying, biology book or good notes, pen, pencil, exercise book
Curriculum for this course
24 Lessons 06:29:35 Hours
Neural coordination in animals
18 Lessons 04:42:11 Hours
  • Concept of coordination
    Preview 00:15:40
  • Components of coordination system
    00:21:47
  • What is neuron?
    00:19:34
  • Structure of a neurone and synapse
    00:17:45
  • Types of neurons
    00:21:26
  • The central nervous system
    00:18:44
  • Division of the brain
    00:13:02
  • The spinal cord
    00:10:40
  • Peripheral nervous system
    00:14:28
  • Conduction of nerve impulse
    00:15:01
  • Reflex action and reflex arc
    00:18:23
  • Sense organs
    00:12:09
  • The ear
    00:18:09
  • The eye
    00:14:21
  • Accomodation of the eye
    00:20:47
  • Disorders of the eye
    00:08:37
  • Skin as the sense organ
    00:11:34
  • The tongue and nose
    00:10:04
Drugs and drug abuse
2 Lessons 00:34:40 Hours
  • Concept of drug
    00:16:06
  • Drug abuse
    00:18:34
Hormonal coordination
2 Lessons 00:37:26 Hours
  • Hormonal coordination
    00:17:37
  • Disorders of endocrine system
    00:19:49
Coordination in plants
2 Lessons 00:35:18 Hours
  • Phototropisms
    00:21:35
  • Phytohormones
    00:13:43
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About instructor

Dr. Mlelwa

Dr. Mlelwa is an experienced online tutor in biology and chemistry from ordinary level to advanced level. His highest level of education is two years of doctor of medicine (MD) at Muhimbili university of Health and allied science in from Nov 2018 to Sept 2020. There after he failed to continue with Doctor of Medicine Studies due to several reasons which are out of scope of this description. He started online teaching since January 2020 in his YouTube channel (Dr.Mlelwa Lectures) by that time he was still a medical student dreaming to become one among the best tutor in medical studies, that's why he called the channel Dr. Mlelwa Lectures, comparing to Dr. Najeeb Lectures who was one of his role mode. His good performance, being the second best boy in advanced biology examinations national wise in 2018, made him one among most interesting online tutor, having influence to different students inside Tanzania as well as abroad.

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Naitwa Helbeth Issack Mlelwa. Siku ya ijumaa, March 13, 1998, historia na kumbukizi za wazazi wangu zinasema kwamba ndio siku ambayo nilizaliwa na nafsi yangu ikaonja pumzi ya duni...
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