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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
What is an autonomic response to the environment?
An example of an autonomic response would the response of the body to cold. The blood vessels to the skin constrict to prevent transdermal heat loss and the in addition the adrenal system activate thermogenesis.
there are a tone of reasons why....
1. stress
2. hitting your head
3. sickness
4. anger
there are alot of other reaosns!!!!
How does insulation of a nerve benefits the functionality of the nervous system?
Insulation of a nerve helps conduct the electric signal through it faster as the signal jumps from node to node along an axon and bypasses the insulation part (Schwann cells). So nerve insulation makes our nervous system more efficient.
True
What cranial nerve is used for pupillary constriction?
The Third Oculomotor Nerve.
Pupil constriction is also known as the pupillary reflex or miosis. It naturally occurs as the result of signals sent from the brain down the oculomotor nerve.
There are two main nervous systems in the body, the Central Nervous System and the Peripheral Nervous System. The Central Nervous System consists of the brain and the spinal cord. All other nerves, including the oculomotor nerve,which is made up of twelve paired cranial nerves, are part of the peripheral nervous system.
These twelve paired nerves are made of what are called efferent nerve fibers, the kind that move information away from the brain instead of towards it (afferent nerve fibers move signals toward the brain). All nerves in the peripheral system have a designation of either afferent (moving toward the brain with information) or efferent (taking signals from the brain to cause responses elsewhere in the body).
There are three different cranial nerves that affect eye movements: the third cranial nerve, the fourth and the sixth. It is the third oculomotor nervethat carries the signal from the brain to the muscle that contracts to constrict the pupil, hold the eyelid open, and also to signal most, but not all, of the movements of the eye.
There are two main triggers for the brain to send information down the oculomotor III nerve with a command to constrict the pupil:
* Bright light shining in the eye An eye is an organ that detects light. When bright light is shone on the eye, it will send a signal up to the brain by way of an afferent nerve. The brain will in turn send a signal down the third oculomotor nerve, an efferent nerve that carries signals from the brain, to the circular iris sphincter muscle (the ciliary muscle) to make it tighten. When the ciliary muscle tightens it closes the iris opening tight, like a purse string, automatically constricting the pupil to let less light in.
* Accommodation Reflex action
Those same ciliary muscles in each eye can be signaled to constrict the pupil when the brain is triggered by a specific reflex action. This reflex is called Accommodation. It occurs when the eye focuses on a near object, after a distant object and vise versa. The near object (for example, a computer screen) looks big in the field of vision, and the eye receives light from wide angles. When you focus on that near object, the pupil constricts in order to prevent bending light rays from hitting the edges of the retina which would result in a blurry image. As the pupil constricts, the lens becomes more round to allow for the diverging light rays.
Other triggers of pupil constriction are the direct action of miotic drugs and indirect action of opiates
* Actions of drugs
Certain drugs cause constriction of the pupils, such as heroin and other opiates (indirect drug action). Other drugs that also cause pupils to be "pinpoint" are called miotics (direct drug action).
the short branched nerve fibers on the nerve cell are called dendrites
The portion of the brain, consisting of the medulla oblongata, pons Varolii, and midbrain, that connects the spinal cord to the forebrain and cerebrum.
Read more: brain-stem
Does the synapse occur between nerve cells?
I wouldn't use the word "occur" since a synapse is a structure, not an event, but yes, it is located between nerve cells, or more specifically, it is where the dendrites of two nerve cells meet.
What is a pudendal nerve motor latency test?
The pudendal nerve motor latency test is a diagnostic procedure used to assess the function of the pudendal nerve, which innervates the pelvic floor muscles and is crucial for bladder and sexual function. During the test, electrical stimulation is applied to the pudendal nerve, and the resulting muscle response is measured to determine the latency period. Prolonged latency can indicate nerve dysfunction or damage, helping to diagnose conditions like pelvic floor disorders or neuropathies. This test is often used in patients with urinary incontinence or pelvic pain.
What nervous system receives information from sense organs and analyzes the information?
the peripheral nevous system
What is the specialized group of peripheral nerves that mainly functions automatically?
The specialized group of peripheral nerves that mainly functions automatically is known as the autonomic nervous system (ANS). It regulates involuntary bodily functions, such as heart rate, digestion, and respiratory rate, without conscious control. The ANS is divided into two main branches: the sympathetic and parasympathetic nervous systems, which work together to maintain homeostasis in the body.
myelin sheath
What consists the peripheral nervous system?
-cranial nerves: which are located on the brain and carry impulses to the head and neck
-spinal nerves: which extend from the spine and provide information to areas of the body below the neck
-autonomile nerves: which responsible for involuntary body functions such as breathing and digestion
What carries signals throughout the nervous system?
Nerves transmit messages by using chemical messengers called neurotransmitter. Some you may have heard of are acetylcholine, norepinephrine, and dopamine. Basically, an electrical impulse travels down a nerve starting at the dendrite, moving through the cell body, and finally to the axon. At the axon special receptors sense the electrical impulse and use voltage gated Calcium channels to release neurotransmitters across the synapse. In the synapse, the neurotransmitters travels to the next adjacent neuron where special receptors on its surface "pick up" the neurotransmitter, this caused a second electrical impulse, called an action potential, to be generated starting up the whole process again.. Dr. Dan
Which lobe do the glossopharyngeal nerve and the vagus nerve send information to?
The glossopharyngeal nerve and the vagus nerve primarily send information to the medulla oblongata, which is part of the brainstem. This area is involved in autonomic functions and processes sensory information related to taste, cardiovascular regulation, and respiratory control. Additionally, the vagus nerve has extensive connections throughout the brain, influencing various regions, including the limbic system and the hypothalamus.
Which nervous system is resonsible for keeping your heart beating?
The autonomic nervous system (ANS) is responsible for regulating involuntary functions, including heart rate. Within the ANS, the sympathetic division increases heart rate during stress or activity, while the parasympathetic division slows it down during rest. Together, they maintain the balance needed for the heart to function properly.
No, a mouth is not a nervous system. The mouth is a part of the digestive system and plays a role in eating, speaking, and breathing. The nervous system, on the other hand, is a complex network of neurons and cells that transmit signals throughout the body, coordinating various functions. While the mouth does have sensory nerves that contribute to taste and touch, it is not itself a nervous system.
How many pairs of carnial nerves are present in man?
Humans have 12 pairs of cranial nerves. These nerves emerge directly from the brain and brainstem, and they are responsible for various sensory and motor functions, including vision, hearing, taste, and movement of facial muscles. Each pair is designated by a Roman numeral I through XII, based on their position from the front of the brain to the back.
