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Nervous System
This category is for questions about the mechanical and chemical process of reactions to internal and external stimuli, ranging from the brain down to the spinal cord, and all nerves, cells and tissues in between.
3,047 Questions
Which cranial nerve will help you blink your eyes?
The third cranial nerve, the oculomotor is responsible for blinking and most other eyelid movement.
Does impulse travel faster along myelinated neuron?
Yes, impulses travel faster in myelinated axon rather than in unmyelinated. It is mostly due to nodes of Ranvier. Instead of travel along the axon, in myelinated axon impulses "jump" from node to node.
Also there are two types of myelinated axons: type A and type B. (Type C in unmyelinated axon.) Type A is the fastest among all of them.
Which pathways comprise the autonomic nervous system?
two-neuron chain from CNS to effector organs. Parasympathetic and Sympathetic.
What is the major function of the circulatory nervous system?
In circulatory is the u a e i o
In the nervous is the brain for magimbu
what two critical symptoms may occur when a patients takes an overdose of central nervous system depressants
What is suprascapular nerve entrapment?
a rare type of entrapment syndrome that most often occurs in athletes. The major symptom is a dull pain near the shoulder blade, which can progress to weakness and muscle atrophy.
Which body system controls thirst?
The nervous system, in particular a part of the brain called the hypothalamus, controls thirst.
What is the special cell in our skin that allows us to sense pressureheatcold and pain?
The special cells in our skin responsible for sensing various stimuli such as pressure, heat, cold, and pain are called sensory receptors. These receptors include mechanoreceptors for pressure, thermoreceptors for temperature changes, and nociceptors for pain. They convert external stimuli into electrical signals that are transmitted to the brain, allowing us to perceive and respond to different sensations.
What is true about the normal microbiota of the nervous system?
normal microbiota are present in central nervous system only
What is a knot-like swelling in a nerve where the cell bodies of neurons are concentrated?
Paravertbral ganglia (aka sympathetic trunk ganglia)
Peripheral nervous system
What portion of the motor neuron is in the nerve?
A motor neuron is a nerve, specifically it is a nerve that originates in the central nervous system (brain and spinal cord) and ends in its target organ (muscle, gland etc).
Spinal nerves are considered mixed which means that?
spinal nerves are considered mixed, which means they?
What does the contraction of the gastrocnemius muscle usually result in?
type of contraction of gastrocnemius muscle?
The blind spot
What are the general functions of the somatic nervous systems?
The somatic nervous system processes sensory information and controls all voluntary muscular systems within the body, with the exception of reflex arcs.
The basic route of nerve signals within the efferent somatic nervous system involves a sequence that begins in the upper cell bodies of motor neurons (upper motor neurons) within the precentral gyrus (which approximates the primary motor cortex). Stimuli from the precentral gyrus are transmitted from upper motor neurons and down the corticospinal tract, via axons to control skeletal (voluntary) muscles. These stimuli are conveyed from upper motor neurons through the ventral horn of the spinal cord, and across synapses to be received by the sensory receptors of alpha motor neuron (large lower motor neurons) of the brainstem and spinal cord.
Upper motor neurons release a neurotransmitter, acetylcholine, from their axon terminal knobs, which are received by nicotinic receptors of the alpha motor neurons. In turn, alpha motor neurons relay the stimuli received down their axons via the ventral root of the spinal cord. These signals then proceed to the neuromuscular junctions of skeletal muscles.
From there, acetylcholine is released from the axon terminal knobs of alpha motor neurons and received by postsynaptic receptors (Nicotinic acetylcholine receptors) of muscles, thereby relaying the stimulus to contract muscle fibers.
