CBSE Class 10 Biology Control and Coordination
Central Nervous System in Humans
Higher invertebrates' posses a brain, a nerve cord and ganglia for nervous co-ordination.
In vertebrates nervous system comprises the central nervous system, peripheral nervous system and autonomic nervous system.
Central nervous system consists of brain and spinal cord.Nervous and Muscular Coordination
A neuron is a specialised cell which on being stimulated transmits nerve impulses from dendrites to the cyton and then along the axon to the axon endings.
Neurotransmitters are released at synapse.
A reflex arc involves a receptor, spinal cord, motor neuron and the effector.Chemical Coordination in Plants
A rapid and temporary plant movement in response to the touch stimulus is known as seismonastic movement.
The growth movement of plant towards gravity is known as geotropism whereas the growth movement of plant shoot towards light is known a phototropism.
Auxin, gibberellins, cytokinins and abscisic acid are some examples of plant hormones.Chemical Coordination in Animals
Hormone is a specific messenger molecule synthesized and secreted in an endocrine gland.
Pituitary gland, pineal gland, hypothalamus, thyroid gland, parathyroid, pancreas, adrenal glands, and gonads are the endocrine glands in human.
Pituitary gland is under the control of hypothalamus while, adrenaline is the fight or flight hormone.
