Nervous System and Neurons

Gangliosides are glycosphingolipids predominantly found in nerve cell membranes, particularly in the brain and nervous tissue. They play crucial roles in cell signaling and neural function. Option C 'carolia' appears to be a typo, possibly meaning 'cardiac'.

Acetylcholine is a neurotransmitter that carries nerve signals across the synaptic gap between neurons. The synapse is the specialized junction where transmission occurs, not the dendrites, axons, or cytons which are structural parts of neurons.

The soma (cell body) contains the nucleus and organelles necessary for basic cellular functions including protein synthesis. Axons and dendrites are specialized for signal transmission, while synaptic knobs are involved in neurotransmitter release.

Neuromasts are the specialized sensory cells found in the pits and canals of the lateral line system in fishes. They detect water movement and vibrations, helping fish navigate, avoid obstacles, and detect prey.

Preganglionic sympathetic fibers release acetylcholine at their synapses with postganglionic neurons, making them cholinergic. This is true for all autonomic preganglionic fibers regardless of whether they are sympathetic or parasympathetic.

Meissner's Corpuscles are touch receptors located near the surface of the skin. 

The abducent nerve or abducent nerve (the sixth cranial nerve, also called the sixth nerve or simply CNVI) is a somatic efferent nerve that, in humans, controls the movement of a single muscle, the lateral rectus muscle of the eye.

The human brain contains roughly equal numbers of glial cells and neurons (approximately 1:1 ratio), contradicting older claims of 10:1 or 50:1. This ratio varies by brain region but balances overall.

Cells are the smallest living units that make up all living organisms, including humans. Tissues, nerves, and muscles are all composed of cells, making cells the fundamental building block. The human body contains trillions of cells working together.

 Madness is caused due to defect in the brain and paralysis is caused due to defect in the nerves.

Ans - 2

Neurons are indeed surrounded and supported by glial cells (glia). Glia provide structural support, nutrition, and insulation for neurons in the nervous system. This is a fundamental fact of neurobiology.

Nerve impulse conduction refers to the propagation of an action potential along a nerve fiber (axon). This is the process by which the electrical signal travels from the point of initiation down the length of the neuron, not the initiation itself or its transfer to target tissues.

Nerve signal transmission occurs in four distinct phases: resting (polarized), depolarization, repolarization, and hyperpolarization (refractory period). These phases represent the sequential changes in membrane potential during an action potential.