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4 years ago

Smooth ER of a muscle cell:

Medicine

1 answer:

Maksim231197 [3]4 years ago

5 0

Answer: B. Sarcoplasmic reticulum

Explanation: The sarcoplasmic reticulum is the name given to the organelle in the muscle cell, in charge of the storage and regulation of the intracellular calcium levels. It is the smooth endoplasmic reticulum in muscle cells, it means that it does not have ribosomes in its surface.

Option A. Incorrect. A SARCOMERE is the functional and anatomic unit of the striated muscle (skeletal muscle and heart muscle). This word comes from the greek: sarkos (meat), meros (part). That is reason you could find other structures of the muscle cell with this root (SARCO...).

Option C. Incorrect. "Arcolemma" this word does not exist. But if it refers to SARCOLEMMA, this word means: sarko (meat), lema (cortex) in greek. It is the plasma membrane of the muscle cells.

Option D. Incorrect. The SARCOPLASM, comes from the greek: sarko (meat), plasm (matter). This structure is the citoplasm of the muscle cells.

In conclusion, the word SARCOPLASMIC RETICULUM, refers to a structure of the muscle cell, that in this case, is the RETICULUM or the SMOOTH ER.

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Answer:

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Explanation:

Based on the redox reaction of H2O2/MnO4- is:

2MnO4- + 5H2O2 + 6H+ ⇄ 2Mn2+ + 5O2 + 8H2O

2 moles of KMnO4 react with 5 moles of H2O2

To solve this question we need to find the moles of KMnO4 until reach the endpoint. Using the balanced reaction, we can find the moles of H2O2 that must be converted to grams using its molar mass -Molar mass H2O2: 34.015g/mol-:

Moles KMnO4:

0.0297L * (1.4686eq/L) = 0.04362eq MnO4- * (1mol / 5eq) = 0.008723 moles MnO4-

Moles H2O2:

0.008723 moles MnO4- * (5mol H2O2 / 2mol MnO4-) = 0.02181 moles H2O2

Mass H2O2:

0.02181 moles H2O2 * (34.015g/mol) = 0.7418g H2O2

%:

0.7418g H2O2 / 5.0mL * 100

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