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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 are the factors which affect the nerve conduction velocity?
The factors affecting nerve conduction velocity are as follows:
(i) Axon diameter:
An axon with a larger diameter conducts faster. In an unmyelinated fiber, the speed of propagation is directly proportional to the square root of the fiber diameter (D), i.e.,
Conduction velocity a D
(ii) Myelination and saltatory conduction:
Myelination speeds up conduction. Thus, the action potential travels electrotonically along the long myelinated segments, and fresh action potentials are generated only at the nodes. This is called saltatory conduction. In a myelinated neuron, the conduction velocity is directly proportional to the fiber diameter (D).
(iii) Temperature:
A decrease in temperature slows down conduction velocity, (iv) Resting membrane potential. Effect of RMP changes on conduction velocity is quite variable. Usually, any change in the RMP in either direction (hyper polarization or depolarization) slows down the conduction velocity.
What are the 3 major structures of the nervous system?
The most important part of the nervous system is the central nervous system because this system is made up of the brain and the spinal cord.
What is the most abundant tissue in the human body?
Opinions from WikiAnswers contributors: Connective tissue is most abundant and widely distributed tissues in the body. Depending on the country, fat.... collagen, a protein, is the most abundant. collagen is a tough but flexible material that is found in places such as joints.
What part of the nervous system is the sympathetic and parasympathetic?
No. While they are both composed of neurons and support cells, they are classified under different branches of the nervous system. The brain is a part of the central nervous system, while the autonomic nervous system is part of the peripheral nervous system.
What other system is in place to protect the nervous system?
The nervous system is divided into two major parts called the central nervous system (CNS), which is made up of the brain and spinal cord, and the peripheral nervous system (PNS).
The peripheral nervous system is broken down into the somatic nervous system and the autonomic nervous system.
Scientists further divide the autonomic nervous system into the sympathetic and the parasympathetic nervous system.
What is the largest and most complex part of the nervous system?
The nervous system needed a big boss to manage all the neurological parts of the organism. The brain organizes everything and it transmits directives to all organs.
The neurological big boss has a hard task to guarantee that all organs are able to work precisely.
-Cutieful :)
How would you define peripheral nervous system?
The peripheral sytem is the outer layering of the nervous system.It is attached to all sorts of nerves and also the spinal cord The peripheral nervous system is the part of the nervous system that controls the limbs. The peripheral nervous system contains nerves and ganglia outside of the brain and spinal cord.
How does nervous system make us stay alive?
well quite simply it supplys the heart and lungs with a signale to work without your nervuos system you could not move muscles including involintary muscles such as heart &lungs this is y when you get parlyzed from spinal cord injury you may or may not need a breathing machine
Because it transfers neuro-signals to your brain signaling what bodily function it must perform.
The nervous system is divided into which two subsystems?
The Central Nervous System and Peripheral Nervous system
What part of the nervous system is essential for it work properly?
My guess would be CNS (Central Nervous System)
But heres a site, just incase this isn't the correct answer:
http://www.Biology-online.org/8/1_nervous_system.htm
How many molecules are there in a neurotransmitter?
It depends on the calcium voltage at the presynaptic membrane also you have to take the reuptake process into consideration. I believe theres not a right answer just depends.
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What happens when an impulse reaches the synapse?
When the action potential reaches the end of an axon, it causes special chemical messages called neurotransmitters to be released across the space between the neurons (the synapse).
What is the function of the oculomotor nerve?
oculomotor nerve control the muscle that move the eyeball.
close vision
Movement of the eyes.
Focusing the eyes on close objects.
What cranial nerve controls neck and shoulder movements?
Cranial Nerve XI (eleven) is know as the spinal accessory nerve and is responsible for the action of shoulder shrugging by way of its innervation of the trapezius muscle.
The function of this cranial nerve may also be tested by asking the patient to turn their head to the left and right and by resisting this motion by placing your hand on their chin (the muscle tested in this second scenario is the Sternocleidomastoid, SCM).
Which body system detects and interprets information inside and outside the body?
The nervous system detects information inside and outside your body.
How does the nerve impulse cause contraction of the muscle?
The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell. Depolarization triggers the release of calcium ions from the sarcoplasmic reticulum inside the muscle cell. In the presence of ATP, the high calcium level causes the myosin heads to bend, dragging actin filaments towards the middle of the unit of contraction.
What portion of the brain controls muscular coordination?
The frontal lobe controls motor functions and permits voluntary muscle control. The brain stem
Does the nervous system control all of the other systems?
Yes, your senses are your brain's interpretation of the input received through the nervous system.
What cranial nerve is responsible for muscles of facial expression?
Facial nerve, the seventh cranial nerve. It leaves the brain along with eighths cranial nerve through internal acoustic meatus and comes out through stylomastoid foramen to supply the muscles of facial expression.
What are the Nerves that only carry impulses away from the central nervous system called?
efferent nerve
What is a substance found in cigarettes that speed up the nervous system?
Nicotine found in cigarettes speeds up the nervous system.
Why nervous system coordination so fast?
the Nervous system's coordination is so fast mainly because the human body has thousands or even million of nerves cells that are connected to one another. every action that happen in our body is transmitted to the brain. what runs in our nerve cells are called electric impulses the speed of electric impulses is just a split seconds.
example:
when you accidentally touched a hot object the reflex of our body is to let go of it. because the nerves cells already send electric impulses to our brain that the thing we touched is hot. then the brain will send another electric impulses to our hands that says let go of it its hot. this process happens within split seconds only.
