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
patriot [66]
3 years ago
5

Which of the following is the correct sequence of events for muscle contractions?a) motor neuron action potential, meurotransmit

ter release, muscle cell action potential, release of calcium ions from SR, AtP-driven power stroke, sliding of myofilamentsb) neurotransmitter release, muscle cell action potential, motor reuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power strokec) muslce cell action potential, neurotransmitter release, atp-driven power stroke, calcium ion release from SR, sliding of myofilamentsd) neurotransmitter rlease, motor neuron cation potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
Biology
1 answer:
alexandr402 [8]3 years ago
7 0

The answer is; A

When an impulse from the motor neuron reached the neuromuscular junction,  the voltage-dependent calcium channels are activated and the neurotransmitter released from the presynaptic cleft. When the neurotransmitter binds to their receptors on the sarcolemma, the muscle fibers become depolarised; the calcium is released from their vesicles. The Ca2+ ions are important in the power stroke because they bind to troponin. Upon binding calcium, troponin moves tropomyosin away from the myosin-binding sites on actin. Powered by the energy from ATP molecule,  the myosin is able to bind on the actin and slides over the actin filament.

You might be interested in
PLEASE HELP ME !’
blsea [12.9K]

Answer:

C. Osmosis

Explanation:

Osmosis is the net movement of solvent molecules, usually water, from a region of lower solute concentration to a region of higher solute concentration through a partially permeable membrane. Osmosis is a very useful for moving materials in and out of the cell.

Solutions are mixtures of solutes and solvents. The main aim of osmosis is for all the mixture part to be uniform and the solvent equally dispersed to all the part of the solution.

Osmosis is controlled to a large extent by concentration gradient.

Diffusion on the otherhand is the movement of molecules of a substance from one position to another.

Facilitated diffusion and active transport are just mechanisms for transport within a cell or a body.

4 0
3 years ago
Read 2 more answers
16. The goals of biodiversity conservation include all of the following EXCEPT (1 point) protecting individual species. introduc
ludmilkaskok [199]
The best answer is: introducing exotic species into <span> new environments. This can be actually bad, as new species can actually reduce the biodiversity in the environments to which they're introduced</span> , such when cats hunt indigenous birds.

I was a bit thinking about the last option too: making sure local people benefit from conservation efforts. This is not one of the classical goals of the conservation efforts, but since the previous one is definitely correct, i don't this one is. (it's not that it's not a goal, but it isn't a main focus)
4 0
3 years ago
Read 2 more answers
Why do we need to break apart the food we eat?
shtirl [24]

Answer:We need to break apart the food we eat so that our bodies can . . . ... Would make it more difficult for your intestines to break down food. Villi. Their main function is to absorb nutrients into the bloodstream

Explanation:

3 0
3 years ago
Hereditary information for most traits is generally located in
Paha777 [63]

genes on chromosomes

3 0
2 years ago
Select the correct answer.
zhannawk [14.2K]

Answer:

A

Explanation:

Because gases dont have definite volume i learned it in chemistry at cookeville high school

4 0
3 years ago
Other questions:
  • It has been estimated that 99% of the intestinal bacteria are A. facultative anaerobes.B. obligate aerobes.C. facultative aerobe
    9·1 answer
  • A group of scientists in alaska notices that not only have atmospheric co2 levels increased at their sampling site but so too ha
    15·1 answer
  • The number of domains kingdoms and classification levels
    15·1 answer
  • A protective tissue that also secretes is ______________________ tissue.
    14·1 answer
  • Distinguish between internal and. external respiration
    11·1 answer
  • Your lab group is presented with an unknown mollusk. Your task is to assign it to one of the major taxonomic classes. Which char
    12·1 answer
  • When paleontologist refer to the "Big Five" to what are they referring?
    9·1 answer
  • Which scientific investigation has A question procedure and conclusion
    13·1 answer
  • Erythrocytes, leukocytes, and thrombocytes respectively refer to
    8·1 answer
  • Help I need helpppppppoo
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!