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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
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.
Most metabolic and regulatory functions in a neuron happen where?
happens in the soma (aka the cell body)
Where are your nerves located?
the biggest nerve in the human body is located in the prostate, as a matter of fact if the nerve in your prostate is severed it may lead to complete paralysis
Why is your girlfriend so nervous?
There are many possible reasons. For example, perhaps she has had some bad experiences, perhaps she is worried about getting pregnant, or perhaps she is self-conscious about her body. Alternatively, perhaps she has strong religious convictions and feels that sex before marriage is a sin. Try gently talking to her about what might be making her nervous.
What is the nervous system that functions without conscious effort?
The autonomic nervous system functions independently and continuously without conscious effort.
Name of the first neurotransmitter to be discovered?
Otto Loewi discovered neurotransmissions in 1921. he was a Australian scientists.
Does the thymus stimulates metabolism growth and activity of the nervous system?
yes other than controlling electrolytes, the adrenal gland helps to regulate metabolism and interacting with sympathetic nervous system in response to stress.
Would the body survive if the nervous and the respiratory system working together?
they already are working together
that's how your heartbeat raises when you're scared shitless.
that's how your breathrate goes up and your face turns red when you see someone you love
the body would NOT survive if they were not working together. if that were to happen people could only be kept alive using a mechanical computercontrolled breathing apparatus controlled by a machine which measures the oxygenlevels in the bloodstream.
What is the space between two adjacent nerve cells?
its known as the synapse. Through the synapse is where impulses travel from brain cell to brain cell.
