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
Monica [59]
3 years ago
9

Sequence the events that take place when a motor neuron's action potential triggers a muscle contraction.

Biology
2 answers:
iogann1982 [59]3 years ago
5 0

Answer:

The correct sequence is: A) The motor neuron's action potential arrives at the neuromuscular junction, C) The muscle fiber's plasma membrane depolarizes in response to the arrival of acetylcholine, F) The action potential moves throughout the muscle fiber along transverse (T) tubules, E) The sarcoplasmic reticulum becomes more permeable in response to the action potential, causing a release of calcium ions, D) Calcium ions bind to troponin, which changes the conformation of the tropomyosin so the actin-binding sites are exposed, B) Myosin cross‑bridges attach to actin fibers.

Explanation:

The question is referring to the process of muscle contraction thanks to the action potential transmission in the neuromuscular junction.

This process begins when the motor neuron's action potential arrives at the neuromuscular junction and excites the muscle fiber with the presence of acetylcholine, which depolarizes the membrane. This information is transmitted through every myocyte thanks to the T tubes, this is important because myocytes must coordinate in order to produce an effective contraction of the muscle. The action potential makes the sarcoplasmic reticulum release calcium ions that will arrive at the sarcomeres and bind to troponin molecules in order to uncover the hidden actin-binding sites. With the actin-binding sites now uncovered, the myosin heads can form cross bridges with it, which will lead to the shortening of the sarcomere and finally produce the contraction of the muscle.

Serhud [2]3 years ago
3 0

Answer:

A,C,F,E,D,B

Explanation:

The is the sequence of  action potential transmission at  at the neuromuscular junction. Generally the arrival of action potential from the presynptic neuron caused influx of ca+ which causes migration and  the  release of the the acetycholine to the synaptic cleft.

The acetycholine binds with the receptors  on the saccolemma to causes opening of Na+ , its influx to causes depolarizarion  of the sacolemma. The depolarization of the latter spreads along the transverse tubules, This depolarization causes increases in the permeability of the sacorplasmic reticulum, with opening of ca+ channels and diffusion of Ca+ out of the  S. reticulum.

The Ca+ binds to troponin,and tropomyosin  exposed the myosin-binding sites on actin filament . The myosin head forms the cross bridges with the filament, and therefore the sacomere shortens leading causing muscle contraction.

You might be interested in
Describe the three types of predation and give an example of each.
uranmaximum [27]
<span>True predation is when a predator kills and eats its prey. Some predators of this type, such as jaguars, kill large prey. They tear it apart and chew it before eating it. Others, like bottlenose dolphins or snakes, may eat their prey whole. In some cases, the prey dies in the mouth or the digestive system of the predator. Baleen whales, for example, eat millions of plankton at once. The prey is digested afterward. True predators may hunt actively for prey, or they may sit and wait for prey to get within striking distance. In grazing , the predator eats part of the prey but does not usually kill it. You may have seen cows grazing on grass. The grass they eat grows back, so there is no real effect on the population. In the ocean, kelp (a type of seaweed) can regrow after being eaten by fish.</span>
3 0
3 years ago
Differences in traits are called
Tcecarenko [31]

Answer:

The observable traits expressed by an organism are referred to

EXPLANATION:

An organism's underlying genetic makeup, consisting of both physically visible and non-expressed alleles, is called its genotype. Mendel's hybridization experiments demonstrate the difference between phenotype and genotype.

3 0
3 years ago
Identify the specialized structures in the cell membrane that are involved in communication
Fed [463]

I believe it is Plasmodesmata

6 0
3 years ago
write an essay about the best meal you’ve ever eaten using all five senses (smell, taste, hearing, touch, sight)
san4es73 [151]

I was sitting in my room, my eyes glued to the flashing screen, the palm of my hands slick with sweat as I struggled to hold onto the controller, the smooth surface slipping every second or so. I could barely hear anything, but the blaring of the sound effects that blasted through my room, shutting out any sound, including the knock on my door from my mother. I started, dropping the controller, my eyes wide. I snapped "What!" at my mother, her face contorting into pinched irritation. "Dinner is ready." She said, turning away to head back down the stairs. My eyes shifted to the open doorway, the nostrils of my nose flaring as I took in the scent of food. I could smell spices, and the humid stench of steam. My stomach growled and I quickly shot up from the floor and thundered down the stairs, leaping into the kitchen to find the source of the heavenly smells that wafted in my direction. I spotted turkey, garnished with lemon and green herbs, and sitting beside it, a large bowl of something off-white. It looked like mashed potatoes. I hastily took a seat and set my elbows upon the wooden surface of the table, my mother scolding me over her shoulder as she divided place settings. "Elbows off, please." She piped, pulling out her own chair with an ear splintering squeal that grated my nerves, causing my teeth to grind together. My mother passed a plate of green beans towards me, and I quickly scooped them onto my own plate, then going for the turkey, the mashed potatoes added last. With no time for prayer, I dug in, the tinges of my fork scraping against the plates clay surface as I scooped a fork full of beans up, and shoved it into my mouth. It tasted bland, with the barest hint of salt. I swallowed, cringing as it went down and took a bite of the mashed potatoes. Of course it was delicious. They were light, buttered perfectly. I gave a small sound of appreciation and went for the turkey last. I stabbed a piece of meat and popped it into my mouth, the texture odd. Hard to describe really. It was tough, but also soft enough to bite into, and with lemon added into it, it was tangy, making my mouth salivate. My mom smiled at the expression my face, nearly laughing. I made a face at her and swallowed, going in for another bite.

6 0
3 years ago
How many times would Earth rotate on its axis during one revolution of the sun?
Xelga [282]

The Earth will perform 366.25 rotations per revolution about the Sun.

<h3>What is Revolution?</h3>

This is defined as the motion around the Sun along its orbit which is common with planets such as the Earth.

The Earth rotates 366.25 times around the Sun and which is equivalent to a calendar year which is used for time keeping.

Read more about Revolution here brainly.com/question/16533738

8 0
2 years ago
Other questions:
  • About what percentage of the cell cycle is shown for dna replication
    7·1 answer
  • The atmosphere is 80% nitrogen: why do you think plants and animals can't use nitrogen as it is found in the atmosphere?
    10·2 answers
  • What is a good way to show gravitational force to you classmates?
    7·1 answer
  • Name three desirable traits that are being transferred into genetically egineered food crops. How might these traits help to inc
    7·2 answers
  • After years of civil war, what took place in nicarague after a cease-fire was agreed-to in 1990?
    10·2 answers
  • The genes for alpha-goblin and beta- goblin are found _______.
    7·2 answers
  • A stomach is made up of multiple tissues. What level of organization is a stomach?
    13·2 answers
  • The primary function of DNA polymerase is to:
    9·1 answer
  • Many mutations in receptor kinases that lead to cancer allow the dimerization and activation of the receptor, even in the absenc
    6·1 answer
  • N a dihybrid cross for round and yellow seeds (RrYy x RrYy), what is the probability of having green and wrinkled seeds?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!