1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Maru [420]
3 years ago
13

Please describe the signal transmission across a myoneural junction that allows the nervous system to move the muscles of a foot

ball player during a game? please be detailed with your description. hint: review your video worksheets from your lesson for details on nerve impulse transmission
Biology
1 answer:
Tems11 [23]3 years ago
5 0

The contraction of the muscles (whether at the level of the arms or the legs) and more specifically the muscular fibers of the musculoskeletal system, that is to say organs, in the broad sense of the term, allowing the movement, is normally under the total dependence of the nerves which transmit a nervous command.

This command can be considered as a voluntary order (from the cerebral cortex). This nerve impulse then takes the direction of the spinal cord where it is directed by a series of nerves called relays to route the nerve impulse (order) to the muscles.

Then the nerve impulse propagates along the axon and when it reaches the motor plate it causes the release of a substance called neurotransmitter: acetylcholine. The neuroreceptor, in the motor plate, receives the nerve signal that the end of the axon transmits to it by a chemical mediator. Acetylcholine binds to the receptors, triggering a contraction of the muscle cell.

<em>More precisely, acetylcholine is enclosed in vesicles (a kind of tiny sphere-shaped grains) located within the nervous corpuscles located at the end of each neuron. When nerve impulses (stimulation) reach the presynaptic membrane, acetylcholine is released and diffuses into the synaptic cleft (about 50 nanometers wide) filling it. Acetylcholine will at this time bind very briefly to receptors located after the synapse (postsynaptic) and trigger the opening of sodium channels (followed by their closure and an opening of potassium channels). These channels are tiny tubules allowing the passage of ions (atom having lost or gained an electron). </em>

<em>This results in the propagation of an "electric charge" action potential at the origin of the passage of the nerve impulse, in other words of the order given by the brain or by the autonomic nervous system. </em>

<em> </em>

After this first step acetylcholine is then released and degraded by an enzyme called acetylcholinesterase (AChE) located in the synaptic cleft but also on the postsynaptic membrane. The choline thus released is then recaptured by the presynaptic bodies and reused for the synthesis of new acetylcholine molecules.

Acetylcholine is involved in the control of muscles via neuromuscular terminations and viscera or glands and sometimes both. This is how it intervenes to make also work for certain organs like the heart, the salivary glands, the sweat glands, the bladder, the bronchi, the eyes, intestine etc.

<em>A variety of enzymes called cholinesterases allow the rapid inactivation of acetylcholine. The chemical reaction that causes the contraction of the muscle fiber is a brief phenomenon. Indeed, acetylcholine is very rapidly degraded by cholinesterases. As a result, acetylcholine itself cannot be used in drug form. Nevertheless to circumvent these difficulties other drugs reproduce or prevent the effects of this neuromodulator. These are agonists or antagonists respectively. </em>

The muscular fiber is an elongated cell used in the composition of the muscle, which is a fleshy organ with the property of contracting and relaxing. Each muscle cell is surrounded by a membrane containing a cytoplasm called sarcoplasm with myofibrils which are elongate filaments parallel to the major axis of the cell.

You might be interested in
As a conservationist, what are your top three concerns regarding the hydroelectric dam and the biodiversity of the region?
storchak [24]

Answer:

I’m concerned about how the dam will affect the water flow in the river, which can affect the behaviors of fish. I’m also concerned that some fish and aquatic animals might get sucked into the dam. Finally, I worry that the dam could malfunction and cause flooding, which could damage the ecosystem.

Explanation:

4 0
3 years ago
Read 2 more answers
The variability in marine salinity between habitats does not impact the fish living there
Arada [10]
The answer is false.
The variability in marine salinity between habitats does impact the fish living there.
I hope this helps.
5 0
3 years ago
Read 2 more answers
9. On some small islands in the Pacific Ocean, the average sea level is rising on the beaches little by little each year. Reside
Lelu [443]

Answer:

the answer is always c trustttt

4 0
2 years ago
Sort the descriptions of open clusters and globular clusters into the correct categories
weeeeeb [17]

Answer:

Open Clusters: A, B, F

Global Clusters:  C, D, E

Explanation:

I just got them all correct

8 0
2 years ago
the autonomic (involuntary) nervous system controls the rate at which the heartbeats. sympathetic (fight or flight) signals spee
Vanyuwa [196]

the autonomic (involuntary) nervous system controls the rate at which the heartbeats. sympathetic (fight or flight) signals speed up the heart’s rate while parasympathetic (rest and digest) signals slow it down. The part or parts of the heart that forms sympathetic and parasympathetic neurons form synapses is called cardiac plexus.

Cardiac plexus is a plexus of the nerves that are present at the base of the heart and is divided into superficial and deep part. The sympathetic and the parasympathetic nerves form synapses with heart in the form of cardiac plexus.

The sympathetic nerves are responsible for activating flight or fight mode while parasympathetic nerves are responsible for restoring the normal body state.

To learn more about sympathetic nerves here

brainly.com/question/7495218

#SPJ4

5 0
1 year ago
Other questions:
  • Why can algae and cyanobacteria be considered indicators of productivity as well as of pollution
    11·2 answers
  • What was Lamarck's Theory?
    9·1 answer
  • Which statement describes what happens to the carbon dioxide produced in cellular respiration? It is excreted from the body as l
    10·1 answer
  • Why are the seminal vesicles important for human reproduction
    8·1 answer
  • Growing food in urban areas could improve full security worldwide
    7·1 answer
  • The goal of transcription is to produce a __________________________ from a ___________________
    15·1 answer
  • Biomes in Nigeria and their characteristics (five each)
    14·1 answer
  • The nucleus is filled with a jellylike called the
    13·2 answers
  • How does single called <br> organisms move?
    8·2 answers
  • Which of the following traits are derived in primates, not ancestral? Mark all that apply.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!