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3 years ago

Extracellular calcium ions are important for the contraction of what type(s) of muscle tissue?

1 answer:

8 0

Extracellular calcium is important for the contraction of smooth muscle tissue as well as the cardiac muscle tissue. Both smooth muscles and cardiac muscles do not have the sarcoplasmic reticulum and t-tubule system found in skeletal muscles where calcium ions are stored for the initiation of excitation contraction coupling. In smooth muscles and cardiac muscles, calcium comes from the extracellular space which triggers the excitation contraction coupling.

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3 years ago

Plasma membrane of a skeletal muscle fiber - _________Extension of the sarcolemma that dives into the muscle fiber and surrounds

Tpy6a [65]

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1. Sarcolemma

2. T-Tubule

3. Sarcoplasmic reticulum

4. Terminal Cisternae

5. Myofibrils

6. Myofilament

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8. Thin filament

Explanation:

These are all parts of the skeletal muscle and they are all involved in the contraction of your muslces.

The sacrolemma is also known as the myolemma. It is a specialized plasma membrane of the skeletal muscle cell. It is an excitable membrane that shares similarities to the cell membrane of a neuron cell.

The T-tubule extends from the sarcolemma to the sarcoplasmic reticulum (SR). This is the smooth endoplasmic reticulum of the muscle cell. When the sarcolemma gets excited, it triggers the SR to release the calcium ions stored in it. The release of Calcium ions triggers the contraction of myofilaments.

There are two types of myofilaments, the thick myofilament and the thin myofilament. These myofilaments contain contractile proteins, actin and myosin. Thick myofilaments contain myosin where one thick myofilament contains 300 myosin molecules. Thin myofilaments contain contractile and regulatory proteins. These myofilamens make up myofibrils.

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Lactose, or milk sugar, is composed of one glucose unit and one galactose unit. It can be classified as a.

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Lactose, or milk sugar, is composed of one glucose unit and one galactose unit. It can be classified as a disaccharide.

<h3>What is disaccharide?</h3>

Any material made up of two simple sugar molecules (monosaccharides), coupled to one another, is referred to as a disaccharide, often known as double sugar.

A disaccharide (also known as a double sugar) is the sugar that results from the glycosidic connection of two monosaccharides (simple sugars). Disaccharides are water soluble, just as monosaccharides. The sugars sucrose, lactose, and maltose are three typical examples.

Disaccharides. Two monosaccharide units are joined by glycosidic linkages in either the or orientation to form disaccharides. Sucrose, lactose, and maltose are the three most significant ones.

To learn more about disaccharide visit:

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