Slide 1
PREPARED By-Tanavi D. Chati coordination of human
lifeCoordination is the adjustment of our bodys responses towards
any stimuli that involve several parts of body.
Importance of body coordinationEnables all body organs to
function as a unit to detect stimuli and respond towards
themHelping us to avoid injuries or dangersEnables us to adapt to
the changes around usCOORDINATION SYSTEM OF HUMAN LIFENeuroneA
neurone is a basic unit of the nervous system.Function: to carry
impulses from receptor(sensory organs) to effector (organ
responding to perticular stimuli)
Central Nervous SystemIt is the control centre of the
body.Brain: control all activities of the bodySpinal cord: control
the reflex actions
It receives impulses form the acceptor/receptor (sensory
organs), interpret it and sends new impulse to the acceptor (muscle
and gland).
Impulse: the electrical signals carrying messages
Human Brain
CEREBRUM-control voluntary actions: mental activity, senses and
muscle movement-Largest partMEDULLA OBLONGATA-connected to spinal
cord-control involuntary actionsCEREBELLUM-coordinate body
balance-coordinate muscle movement
Smell and tasteSpeech Thinking, memory, learningMotor
centre(movement)Touching (sense in skin and muscle)Hearing Vision
DIFFERENT CONTROLLING PARTS IN THE BRAINReflex action
(involuntary)Definition: automatic reaction by an external stimulus
without the involvement of thinking.
It takes place in the spinal cord.
The path of reflex action is called a reflex arc.
b) Peripheral nervous systemFunction: to transmit impulses from
the sensory organ or receptor through the central nervous system to
the muscle or the gland.
The peripheral nervous system is divided into:Somatic nervous
system: control all voluntary actionsSpinal nerve: walking,
scratching, writing (limbs, skin and abdomen)Cranial nerve:
talking, smiling, seeing (head and neck)
Autonomic nervous system: controls involuntary actions (internal
organs)
Chemical coordination in the body
Takes place by chemical messengers- HormonesHormones: chemical
substances secreted by endocrine glands directly into the
bloodstream.
Characteristics:ProteinReleased in small quantitiesSpecific to
target organs Slow to respond
Endocrine glands (ductless glands): coordinate body activities
in respond to stimuli by secreting hormones.DIFFERENCESNERVOUS
COORDINATIONHORMONAL COORDINATIONImpulses are sent throughConsists
ofSpeed of impulsesEffect Target areaResponse Nerve
fibresNeurones(electrical impulse)Fast Localised, temporary,
reversibleMuscles, glandsRapid, short-livedBlood circulatory
systemHormone (chemical substances)Slow Widespread, permanent,
irreversibleTarget organs onlySlow, diffuse, long
lastingCONCLUSIONThe Importance Of Nervous System And Hormonal
System Coordination:
To ensure body functions such as physical, chemical and
physiological responses occur at their optimum level.
It ensures that if one system is not able to respond, then the
other will compensate.THANK YOU
