Neural Control and Coordination Test - 2

The pneumotaxic centre is situated in pons. This centre regulates the change from inhalation to exhalation.

Transducin activates the enzyme phosphodiesterase which catalyses the conversion of cGMP into 5'GMP.

12 pairs, i.e. maximum number of spinal nerves, originate from thoracic region.

The internal cavities of ventricles are lined by specialised ciliated epithelial cells known as ependymal cells.

Efferent vagus nerve fibres innervating the pharynx and back of the throat are responsible for the gag reflex.

In the nervous system of roundworms Caenorhabditis elegans, sexual dimorphism can be seen. The nervous systems of the two sexes, males and hermaphrodites, have different numbers of neurons and groups of neurons that perform sex-specific functions. In C. elegans, males have exactly 383 neurons, while hermaphrodites have exactly 302 neurons.

In humans, 5-5 pairs of spinal nerves arise from lumbar and sacral regions of the spinal cord.

Pineal body is known as the master clock because it modulate sleep patterns in humans. It secretes a hormone called melatonin whose production is stimulated by darkness and inhibited by light.

Glossopharyngeal nerve is a mixed nerve; it carries afferent sensory and efferent motor information. It originates from posterior side of medulla.

Sympathetic nervous system stimulates the adrenal glands to secrete adrenalin. Thus, sympathetic nerves function with adrenal glands as a well integrated sympathetico-adrenal system having widespread effects.