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timama [110]
4 years ago
10

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

Biology
1 answer:
zaharov [31]4 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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6. Multiple genes interact to determine the phenotype.
Galina-37 [17]

Answer:

6.polygenic traits

7.codominance

8.multiple alleles

9.incomplete dominance

Explanation:

because i did it in savvas and i got it right.

3 0
2 years ago
In the 1950s, when Watson and Crick were working on their model of DNA, which concepts were well accepted by the scientific comm
bogdanovich [222]

Answer:

The correct answer will be-

1. Chromosomes are made up of protein and nucleic acid.

2. Genes are located on chromosomes.

3. Chromosomes are found in the nucleus.

Explanation:

Watson and Crick are known for their findings on the structure of DNA in 1953. Their findings were motivated by the book called "What is Life?".

The book stated the concepts which were well accepted by the scientific communities that is the gene determines the trait which is located on the chromosomes proved by the experiments of Morgan.  

The chromosomes are the condensed structure present in the nucleus was suggested by the Nageli in 1884. The chromosomes are composed of nucleic acid and protein was also proved and was well-accepted fact.

But the genes are made up of DNA was not well accepted which was suggested by the experiments of Avery in 1940s.

Thus, the selected options are the correct answer.

5 0
4 years ago
Mixtures of solids can be<br> separated based on what?
ivann1987 [24]

Answer: Observable properties

Explanation:

7 0
2 years ago
3)The Moon rises approximately one hour later every day from sunrise to sunset, as the phases of the moon progress. Why is this?
ladessa [460]

Answer:

The answer is B

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The earth rotates 360 degrees on its axis every 24 hours which is why we have day and night.

6 0
2 years ago
In co-dominant traits, what is the phenotypic ratio when two heterozygotes cross?
vodomira [7]
25% display the just one trait : 50% display the co-dominant trait : 25% display the just the other trait



For example: a cross of a pink flower and and another pink flower where white and red are co-dominant

25% white : 50% pink : 25% red
4 0
3 years ago
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