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vazorg [7]
4 years ago
15

If the na+ voltage-gated channels in a muscle cell open, what will be the result?

Biology
2 answers:
sammy [17]4 years ago
4 0
If the Na+ voltage-gated channels in a muscle cell open, the Na (sodium) ions rush inside the muscle cell and makes the cell more positive as Na ions carry positive charge on it. Due to the entry of positively charged ions inside the cell, the cell becomes less negative and more positive. This is called depolarization of cell.
jeka57 [31]4 years ago
4 0
<span>If Na+ voltage-gated channels open, Na ions will enter the cell and make it less negative or more positive. The neuromuscular junction is a chemical synapse. ... This action potential is propagated along the sarcolemma of the muscle fiber, which triggers sliding of the myofilaments for muscle contraction.</span>
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One method for separating polypeptides makes use of their different solubilities. The solubility of large polypeptides in water
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(a) (Glu)zo or(Phe-Met)3 at pH 7.0

O (Glu)zo ✔

O (Phe-Met)s ❌

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O (Gly12) ❌

O (Lys-Ala)✔

(c) (Ala-Asp-Gly)s or (Asn-Ser-His)s at pH 3.0:

O (Asn-Ser-His)s ✔

O (Ala-Asp-Gly)s ❌

(d) (Ala-Ser-Gly)s or (Asn-Ser-His)s at pH 6.0:

O(Ala-Ser-Gly)s ❌

O (Asn-Ser-Hish)s ✔

Explanation:

Polypeptides that has polar or charged side chains are more soluble than polypeptides with nonpolar side chains.

(a) At ph 7.0

(Glu)20 is negatively charged at pH 7 and more soluble

(Phe-Met)3 is observed to be less polar and less soluble

(b)At ph 7.0

(Lys-Ala)3 is positively charged (polar) and more soluble

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(c) At pH 6.0

(Asn-Ser-His)5 has polar Asn side chains and partially protonated His side chains and it's more soluble unlike the (Ala-Asp-Gly)s at that pH.

(d) At pH 3.0

(Asn-Ser-His)s as partially protonated carboxylate groups of Asp residues and it is also neutral but the imidazole groups of His residues are fully protonated and positively charged. Hence it's more soluble than the (Ala-Ser-Gly)s at that particular pH.

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