Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Nervous system:- It is consist of neurons, bundles of nerve fibres, neuroglia cells and have neurosecretory cells. Human nervous system is consist of two main parts:- CNS (central nervous system)- lies along the main axis of the body, consists of upper large brain in head or narrow spinal cord in neck or trunk.
PNS (peripheral nervous system)- It is associated with the CNS defined by afferent nerve fibre that transmit impulses from receptors present in organs to CNS) and efferent nerve fibre which transmit regulatory impulses from CNS to peripheral organs.
It is divided into two parts:
1. Somatic nervous system relays voluntary impulses from CNS to skeletal muscles.
2. Autonomic nervous system relays impulses from CNS to involuntary parts of the body.
On the other hand, hormonal mechanism is slower than nervous mechanism. Hormones are the chemical messengers which brings control, secreted by endocrine glands and released into the blood stream from axon ending. Various hormonal secretion is done by hypothalamus and are under control of secretion of neurosecretory cells.
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