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Kitty [74]
3 years ago
8

During the contraction of a vertebrate skeletal muscle fiber, calcium ions _____.

Biology
1 answer:
vodomira [7]3 years ago
6 0
During the contraction of a vertebrate skeletal muscle fiber, calcium ions "<span>bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed."

Hope this helps!</span>
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While walking down the street, a cat jumps out of an alley into the pathway of an adult. They note that the man's heart is "raci
Sedaia [141]

Answer: The palpating heart race response is due to the sympathetic nervous system controlling the body's fight-or-flight reactions. 

Explanation:

The sympathetic nervous system is in charged of controlling the body's fight-or-flight reactions. When facing a threat, these responses defaultly prepare our body to flee from danger or face the threat head-on.

Many of the physiological responses you experience during times of emotional streaming, such as sweaty palms or a racing heartbeat, are regulated by the sympathetic nervous system, a branching of the autonomic nervous system.

5 0
3 years ago
Which best explains why muscle cells are different from blood cells
Rus_ich [418]

Answer:

A mutation occurs during the development of muscle cells but not in blood cells. Different genes are activated in muscle cells than in blood cells. Muscle cells experience different environmental influences than blood cells.

Explanation:

3 0
3 years ago
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 The formation of hurricanes, storms, and other weather events require energy. The original energy source for all of these event
DENIUS [597]
What are your answer choices? i would say wave energy
7 0
3 years ago
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What is the probability that a cross between a true-breeding pea plant with spherical seeds and a true-breeding pea plant with w
notsponge [240]

Answer:

1 or 100%

Explanation:

Let the allele for seed shape be represented by S.

True breeding spherical shape seeded pea plant will have SS as genotype

True breeding pea plant with wrinkled seeds will have ss as genotype

Crossing the two:     SS  x   ss

Progeny: Ss, Ss, Ss, Ss

Based on the assumption that spherical shape allele is dominant over wrinkle shape allele, all the F1 offspring will have spherical seeds.

<em>Hence, the probability is 1 or 100%</em>

5 0
3 years ago
Environmental factors can influence natural selection because they can increase or decrease
olchik [2.2K]

Answer:

Environmental factors can influence natural selection because they can increase or decrease the amount of genetic variation in a population.

Explanation:

Natural selection is a process that involves the survival of species through changes in the expression of their genes, making possible the process of adaptation to environmental changes. It is one of the explanations for the biological evolution of species.

The second premise, necessary for natural selection to be possible, implies the existence of a variability (genetics) of traits among individuals in a population.

The other premises of natural selection are the faculty of traits to be inheritable and that genetic variability should lead to reproductive success and survival.

  • <em>The other options are not related to the process of natural selection, since it is not possible for natural selection to increase or decrease the number of chromosomes, in addition to the fact that genetic variability must be observed in a population, not in a single individual, to be considered natural selection </em>
4 0
3 years ago
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