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
A marine biologist measures the density of oyster larvae, in number of larvae per liter of seawater, at four different sites in
Ugo [173]

Answer: stationary

Explanation:

6 0
3 years ago
Which organisms have the most amount of energy in the food web
kicyunya [14]

Answer:

<h3>Max maximum in autotrophs and producer</h3>
4 0
2 years ago
Read 2 more answers
Plastics, synthetic fabrics, and synthetic rubber are composed of chemicals that are derived from
SVEN [57.7K]
Petroleum Products

Petroleum and its products are mainly composed of carbon polymers (chains), as the backbone, with different structural and functional groups. Plastic, for example, is made of polypropylene and polybutylene which is mainly made of carbon atoms, whose monomers are linked in a chain to form polymers that make up the products.
Synthetic rubber on the other hand is made of copolymers of carbon and other addictives such as styrene. Synthetic fiber is made of nylon that is composed of a copolymer between carboxylic acid and amides.
3 0
2 years ago
Through which of the following body parts do humans take in the energy they need to survive? . A - mouth . B - intestines. C - s
Eddi Din [679]
Nutrients and energy from the food (as well as water) we eat are absorbed in the intestines.
5 0
3 years ago
Read 2 more answers
Plucking is caused by_______. <br> Ice <br> Water <br> Wind <br> Sand
makvit [3.9K]
Plucking is caused by ice.
3 0
3 years ago
Read 2 more answers
Other questions:
  • What problem does distilled water in a patient’s bloodstream create?
    12·1 answer
  • What is the base slope degree and summit slope degree of a shield volcano?
    13·2 answers
  • Name three bacteria that commonly cause pneumonia. Which is the most common cause?
    10·1 answer
  • Where does the body absorb most nutrients?
    8·1 answer
  • A child has been born prematurely and is experiencing severe asthma like symptoms. Exposure to what most likely affected cell di
    11·1 answer
  • If this one person planted 40 millions trees, what can you do to make at least a minimum impact to reduce humankind's impact on
    8·1 answer
  • Which of the following describes a general community of deer?
    14·2 answers
  • 1 point
    6·1 answer
  • Energy from food must be transformed into the bonds of
    13·1 answer
  • ¿Que impacto tiene los diferentes tipos de centrales eléctricas en nuestro medio ambiente?​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!