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Stella [2.4K]
3 years ago
9

What chemical ion is responsible for initiating the contraction of a muscle fiber?

Biology
1 answer:
Semenov [28]3 years ago
4 0
Calcium ion is responsible for Muscle Contractions.
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QUESTION 10
ehidna [41]

Answer:

B. VESSELS, HEART, CIRCULATING FLUID.

Explanation:

Blood is the circulating fluid. It is the connective tissue of liquid plasma and cells.

Heart is a muscular pump to move the blood and have it circulate throughout the body of living animals.

Blood vessels are arteries, capillaries and veins that deliver blood to all tissues.

The Circulatory System has two types. They are the open circulatory system and the close circulatory system.

An open circulatory system is one where the blood does not circulate inside blood vessels  but also flows into cavities that irrigate tissues.

A close circulatory system is one where the blood circulate only inside the blood vessels.

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Mark me brainliest

8 0
3 years ago
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A student conducts an experiment with a dog and a statue of a dog. The student provides a slice of bread to both the subjects ev
Sergeu [11.5K]

Answer:

ability to obtain nutrients

ability to grow

ability to respond to the environment

ability to reproduceExplanation:

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3 years ago
What caused natural selection among peppered moths of Manchester England?
Alexus [3.1K]
The natural selection among peppered moths of Manchester, England can be mainly attributed to to the abruptly increasing levels of Air Pollution in England as a result of thriving Industrial Revolution In the U.K.

Soot from power producing factories, etc resulted in complete eradication of lichens in the flora of the surrounding region.

The frequency of the newly evolved peppered moth increased as the dark colour was beneficial in a polluted environment like in Manchester.
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3 years ago
Because of their small size, birds are very light eaters.<br><br> True<br> False
podryga [215]
THE answer is " true "
3 0
3 years ago
How do mutations increase genetic diversity in populations?
umka2103 [35]
Flow of individuals in and out of a population introduces new alleles and increase genetic variation within that population. Mutations: changes to an organisms DNA that create diversity within a population by introducing new alleles.
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