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
SCORPION-xisa [38]
3 years ago
13

The following are required steps in the sliding filament theory of muscle contraction:

Biology
2 answers:
drek231 [11]3 years ago
7 0

Answer: The correct order of the sliding filament theory of muscle contraction is third ( that is 3,1,2,4) -

1) Calcium pumps of the sarcoplasmic reticulum opens.

2) Calcium binds to troponin.

3) Troponin moves.

4)  Myosin heads bend to attach to actin filaments.

During muscle contraction, the thin filaments ( actin filaments) slide pass over the thick filaments ( myosin) and the sarcomere ( unit of muscle contraction ) becomes short. This is explained through sliding filament theory.

When action potential arrives at sarcoplasmic reticulum, calcium ions are released and arrive at sarcomere. They bind to troponin that changes its shape, removing tropomyosin from active sites on actin. Myosin binds to actin and pulls it towards the center of sarcomere ( crossbridge formation that is the contraction phase). Finally, when action potential ends, calcium ions are sequestered back into the sarcoplasmic reticulum and tropomyosin restores the blocking of active site on actin.

lions [1.4K]3 years ago
4 0
I would agree with your answer of C. As there would need to be calcium to start with and they seem to come from the sarcoplasmic reticulum
You might be interested in
2. Which of the following is an inference?
svetlana [45]

Answer:

D. You believe it rained when you see a mud puddle.

Explanation:

A. is incorrect because an inference is an educated guess, and counting 43 tree rings is a conclusion.

C. is also incorrect because you found the temperature with a thermometer, there was no inference made before checking it.

B. is incorrect; inferences are based on past experiences/knowledge, which looking through a telescope at craters on the moon is not doing. It does not disclose other means of reaching the conclusion.

D. is correct. Using skills of observation, you infer that the mud puddle could have been caused by rain.

6 0
2 years ago
Dalton proposed the first atomic model. He's thinking that __________.
velikii [3]
When Dalton proposed the first atomic model, he was thinking that all atoms are alike. The correct answer is A. 
5 0
3 years ago
Read 2 more answers
The Everglades in Florida is an estuary that is very important to the environment. Discuss the important and predict the outcome
Jobisdone [24]

Answer:

Everglades is also called river of grass and is located in Florida. It is the habitat of thousands of species including plants, animals, and microorganisms. It also has approximately 70 different member of species which are in endangered list and it consist of approximately 11% of total wetland.

So everglade is important to protect the ecosystem and the species that live there. So if it would suffer a great drought than most of the species that were dependent on the wetland will go extinct due to habitat loss and it will also affect the economy and natural heritage of Florida adversely because of the environment loss.

5 0
3 years ago
at which location does gravity play a role in moving tectonic plates? at the edge of the plates. in the core. in the mantle. in
yulyashka [42]

Answer:

B. At the edge of the plates

Explanation:

<u>Gravity </u>is the principal <u>driving force </u>of <u>plate tectonics </u>(second one is convection<u>)</u>. It causes different density plates to move on the Earth's surface. However, when a <u>denser plate coincides the less denser plate, the high density plate subducts</u> below the <u>lesser density plate</u>. The process, therefore, is called <u>subduction</u>. During this collision of plates, <u>shearing resistance increases</u> and all <u>pressures come at the edge of the plate</u>. The process continues and the lithosphere drags the rest of the plate. The portion of plate below the less denser plate then reaches the mantle. Here, the edge of plate is destroyed due to high temperature of mantle as well as pressure.

7 0
3 years ago
The nurse is caring for a client before, during, and immediately after surgery. which type of care is provided to the client?
GalinKa [24]
Pre operative operative and post operative care.
5 0
3 years ago
Other questions:
  • How does the sun produce heat and light for the earth?
    14·1 answer
  • If a DNA polymerase recognizes a guanine nitrogenous base on the template strand, which nitrogenous base will it polymerize to t
    5·2 answers
  • Unlike New World monkeys, hominines 
    15·1 answer
  • One company states that it makes the best staplers. To prove it, they use the stapler to staple a thousand papers and compare it
    5·2 answers
  • Several medicines that treat human diseases have been sourced from plants in tropical rainforests. For example, quinine, which i
    15·2 answers
  • The sequence of ________ in mRNA complements the sequence in the DNA template. Pls answer
    7·1 answer
  • Thirty patients with acne volunteer to be treated with either a medicinal lotion
    10·1 answer
  • In some cattle, the genes for red hair and for white hair are codominant. Cattle with alleles for both red and white hair have b
    6·2 answers
  • Why were the prokaryotes split into
    5·1 answer
  • A
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!