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Nutka1998 [239]
3 years ago
15

The main point of paragraph 5 is that-

Biology
2 answers:
kiruha [24]3 years ago
4 0

Answer:

I don't know sorry need to include more details for me to help u , sorry again

Maru [420]3 years ago
3 0
What have you learned about BLM that would get you involved with making your neighborhood safe/getting into politics? I need help
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Name one reason life was impossible on early earth
erastovalidia [21]
Mainly because it was extremely hot at the beginning of Earth's time.
4 0
3 years ago
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What do you think that David would have predicted
makkiz [27]

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Hey there!

I believe that David's prediction would be: If the amount of pollutants in the atmosphere reached an amount unhealthy for the salamanders, then the salamander population would decrease.

Let me know if this helps :)

7 0
3 years ago
Which pattern best describes most evolutionary paths?
Volgvan
Answer is B convergent
8 0
3 years ago
- this occurs when cells use oxygen to<br>produce energy from food​
amid [387]

Answer:

Cellular Respiration occurs when cells use oxygen to produce energy from food you eat.

7 0
3 years ago
You measure levels of Ca2+ in various locations within a motor neuron and a skeletal muscle fiber when the motor neuron is NOT d
gogolik [260]

Answer:

The correct answer is 3: "<em>High levels of Ca2+ are expected to be found </em><em>within the sarcoplasmic reticulum</em>".

Explanation:

Muscular contraction is a highly regulated process that depends on free calcium concentration in the cytoplasm. Amounts of cytoplasmic calcium are regulated by <u>sarcoplasmic reticulum</u> that functions as a storage of the ion.

When a nerve impulse reaches the membrane of a muscle fiber, through acetylcholine release,  the membrane depolarizes producing the entrance of calcium from <u>extracellular space</u>. The impulse is transmitted along the membrane to the sarcoplasmic reticulum, from where calcium is released.  At this point, <em>tropomyosin is obstructing binding sites for myosin on the thin filament</em>. The calcium channel in the sarcoplasmic reticulum controls the ion release, that activates and regulates muscle contraction, by increasing its cytoplasmic levels. When <em>calcium binds to the troponin C</em>, <em>the troponin T alters the tropomyosin by moving it and then unblocks the binding sites,</em> making possible the formation of <em>cross-bridges between actin and myosin filaments.</em> When myosin binds to the uncovered actin-binding sites, ATP is transformed into ADP and inorganic phosphate.

Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band, and producing muscle fiber contraction.

4 0
3 years ago
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