answer.
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
IgorLugansk [536]
1 year ago
8

Place the following events of excitation in the correct order. 1) ion channels on the sarcolemma open and sodium ions enter the

muscle fiber 2) the entry of sodium ions into the muscle fiber depolarizes the sarcolemma locally 3) acetylcholine is released from vesicles in the motor neuron into the synaptic cleft 4) an action potential arrives at the axon terminal of a motor neuron 5) acetylcholine binds to ligand-gated sodium ion channels in the motor end plate
Biology
1 answer:
Gre4nikov [31]1 year ago
6 0

Answer:

4, 3 5, 1, 2.

Explanation:

The events of muscle contraction begins from the presynaptic neuron, which cause the influx of Ca+, and the release of acetycholine neurotransmitter  into the synaptic cleft.

The Ach, binds with the receptors in the sarcolemma, leading to opening of Ligand gated Na+ channels. Therefore Na+diffuses in, causing depolarization, and propagation of action potential along the sarcolemma  spreading to the  T-tubules.

This is followed by opening of Calcium channels leading  exist of Ca+ from the sarcoplasmic reticulum.

The Calcium binds with the troponin, and  Tropomysoin exposed the myosin binding sites  on the actin filament.Thus cross-bridge is formed by the myosin head  with thin filaments which   shortened the sarcomere, leading to contraction of muscle fibres.

You might be interested in
The light reactions require the cooperation of 2 photosystems to power linear electron flow from h2o to NADP+.?
Iteru [2.4K]

Answer:

Only Photosystem I  - 1, 5, 6

Only photosystem II - 3, 2

Both Photosystem I and II   - 4

Explanation:

Only Photosystem I  

a) Reduction of NADP+ -  uses light energy to convert NADP+ to NADPH2

b)  Reduction of electron transport chain between the two photosystems

c) Oxidation of electron transport chain between the two photosystems.

Only photosystem II

a)  Oxidation of water - here the absorbed light energy is used to dissociate of water molecules to produces protons (H+) and O2 along with free ions

b)Reduction of primary electron acceptor - An electron is taken by pheophytin which is a primary electron acceptor molecule that is  located within photosystem II and hence it get reduced.

Both Photosystem I and II  

a) Light is absorbed in both photosystem I and II. While in photosystem I, light waves of large wavelength i.e 700 nm are absorbed, in photosystem II light waves of short wavelength of i.e 680 nm are absorbed.

7 0
1 year ago
The NET reproduction per individual per unit time (r) is _____ per mouse per month in a population of 1,000 mice where 500 mice
Phantasy [73]

Answer:

0.1

Explanation:

The Net Reproduction per individual per unit time (r) can be calculated as (births-deaths)/population size

Given that:

Population size of mice = 1,000; Birth = 500; Death = 400,

Net reproduction rate (r) = (births-deaths)/population size

r = (500 – 400)/1000

r = 100/1000

r = 0.1

The Net reproduction per individual per unit time (r) is 0.1

3 0
2 years ago
In your own words, describe what heredity is and how it works in mice!
maksim [4K]
Heredity is the passing of physical characteristics unto the next generation a mouse for example might have brown fur the mouse he "gets busy with" also has brown fur likely hood of the baby having brown fur is a high likley hood  hence you can say that the baby mouse has brown fur because of the heredity of his parents<span />
8 0
1 year ago
Read 2 more answers
Indicate the stages of life on the timeline including the definite articles. do not repeat any labels. note that items 2-6 refer
Leni [432]

Answer:

The stages of human life can be written as:

  • Infancy: It is the time period between birth and the age of one year.
  • Toddlers: It represents the child between 1 to 3 years of age.
  • Childhood: Children between the age group of 4 to 8 years old are referred to being in childhood.
  • Puberty: It is the time period in which children mature sexually. It represents the children which are 9 to 13 years old.
  • Adolescents: These are also termed as teens as the age bracket is thirteen to eighteen years old.
  • Adulthood: The age range from 19 to  50 years.  
  • Old age: It represents the people which are 51 plus in age.
7 0
1 year ago
Read 2 more answers
In the late 1960s, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone, comparing the species dive
devlian [24]

Answer:

C: competitive exclusion

Explanation:

<em>The competitive exclusion principle states that organisms living in the same community while competing for the same resources cannot coexist at a constant population rate. </em>

Once some of the species within the community get a slight competitive edge over other species, they become dominant and this might lead to the extinction of the weaker species in the long run.

<u>In the experimental plot, the removal of sea stars provided mussel and barnacle with a competitive advantage over other species within the community (sea stars are predators of mussels and barnacles). This led to the dominance of mussel and barnacle and the eventual extinction of other species within the experimental plot as compared to the control plot.</u>

The correct answer is C.

4 0
2 years ago
Other questions:
  • Woolly mammoths were grass-eating mammals that resembled elephants but with heavy coats, large tusks, and small ears that made t
    15·1 answer
  • You approach the scene of a terrorist incident that occurred 2 minutes prior in an enclosed room. it is reported that the smell
    7·2 answers
  • When will a cell have a high degree of potency?
    13·2 answers
  • Which of the following is often provided by anthropologists and biologists as a possible explanation for the development of bipe
    11·2 answers
  • Explain how the Chromosomal Theory of Inheritance helped to advance our understanding of genetics.
    14·1 answer
  • Which of the four levels of protein structure is maintained after denaturing? Explain your answer.
    6·1 answer
  • Sudden, unilateral CP after trauma to the chest: {___________} Cough, SOB, and fever: {___________} SOB with a 30-year history o
    12·1 answer
  • Unionid mussels are native to the Hudson River in New York State. In the early 1990s, zebra mussels were introduced into the Hud
    11·2 answers
  • Type several paragraphs describing the full carbon cycle in detail. i. Discuss all components of your poster, as outlined in ste
    7·1 answer
  • In which two Earth regions is oxygen the second most abundant element by volume?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!