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timama [110]
3 years ago
10

In skeletal muscle Catt is essential for the contraction process. For skeletal

Biology
1 answer:
zaharov [31]3 years ago
4 0

Answer:

The source of Calcium (Ca⁺⁺) for the skeletal muscle cells is the sarcoplasmic reticulum, the main store of intracellular Ca⁺⁺.

Explanation:

Calcium (Ca⁺⁺) is an ion that plays an important role in muscle contraction, a process that requires high cytoplasmic concentrations of this ion to promote myofibrillary activity.

The sarcoplasmic reticulum (SR) -equivalent to the endoplasmic smooth reticulum- is an organelle that regulates the contractile activity of skeletal muscle. The two terminal cisterns of the SR attach to the T-tube, forming a triad, which surrounds the myofibrilla.

Once the muscle cell receives the signal to contract, the Ca⁺⁺ channels are opened and allow Ca⁺⁺ to enter the cell, promoting the exit of this cation from the SR and increased its cytoplasmic levels. This stimulates muscle contraction.

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gayaneshka [121]

Answer:

multidimensional

Explanation:

Development is multidimensional

By multidimensionality, we mean a complex and dynamic interaction of factors that control development all through the lifespan, it as to do it biological, cognitive, and socioemotional changes.

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Puberty deals with a wide range of domains that exemplifies the multidimensionality component of development.

6 0
3 years ago
When are scientific ideas modified?
azamat
The logical answer is c provided that the "new, better idea" stand up to scrutiny under the scientific method.

Politics (b.) should never be a reason for changing scientific ideas.
Likewise, the fame of a particular scientist should have nothing to do with the modification of a scientific idea.
Science uses the scientific method and whether people are tired of old ideas or not is not a reason to change them.
5 0
3 years ago
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What contributes to cell membrane fluidity? Proteins and lipids exist as separate but loosely attached molecules that can move a
Charra [1.4K]

Answer:

Proteins and lipids exist as separate but loosely attached molecules that can move around

Explanation:

Cell membranes are mainly composed of lipids, proteins, and also carbohydrates. Phospholipids are the most abundant type of lipid and the main constituent of the cell membranes. Membrane proteins are divided into two types according to their interactions with the cell membrane: 1-integral (intrinsic) and peripheral (extrinsic) proteins. These peripheral proteins are loosely attached by ionic bonds or calcium bridges with the phosphate heads of the phospholipids; whereas integral membrane proteins contain side chains that interact with fatty acyl groups of the phospholipids. Cell membrane fluidity indicates how easily lipids (e.g., phospholipids and cholesterol) and proteins (e.g., intrinsic proteins) diffuse laterally in the cell membrane. This fluidity is affected by the amount of cholesterol, temperature, and the ratio of unsaturated to saturated fatty acids. Saturated fatty acids have no double bonds in the hydrocarbon chain, whereas unsaturated fatty acids have at least one double bond (these double bonds increase fluidity). Moreover, higher temperatures increase membrane fluidity, whereas cholesterol molecules function to regulate membrane fluidity: at high temperatures cholesterol molecules stabilize the membrane, whereas at low temperatures intercalate between phospholipids, thereby preventing them from clustering together.

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3 years ago
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Both plants and animals have these. It is a eukaryotic cell.
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marishachu [46]
If glycolysis stopped happening in the cell, the cell would not likely produce ATP molecules and in the same time, the Kreb's cycle will not function without it.

Hopefully this helped hun!Have a great day!
7 0
3 years ago
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