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3 years ago

What would happen if someone stabbed your leg with a syringe full of calcium and injected the calcium directly into your muscle?

Biology

1 answer:

Studentka2010 [4]3 years ago

5 0

Answer:

Cross-bridges would form in the absence of an action potential from a motor neuron.

Explanation:

The injected calcium ions would bind to troponin. Troponin would make tropomyosin move away from the myosin-binding sites on actin. The presence of free binding sites on the actin would be followed by the contraction cycle. This would include hydrolysis of ATP to energize myosin heads and binding of these heads to actin to form cross-bridges. Therefore, cross-bridge formation would occur without any action potential if calcium ions are injected directly into the muscle.

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Where does the second, major part of cellular respiration take place

noname [10]

Answer:

The answer is mitochondira of heterotoph cells

Explanation:

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2 years ago

If meiosis failed to occur in both male and female worms the zygote nucleons would resemble diagram

den301095 [7]

Tetraploidy will occur.

<h3><u>Explanation</u>:</h3>

The process of sexual reproduction is very necessary to maintain the genetic setup of the species over the races.

The normal chromosome content of a cell is called diploid state of cell. Its represented by the expression 2n. The cell division that takes place before the gamete formation is called meiosis. This cell division makes the chromosome number of the cells halved. So haploid cells are produced. Its represented by n.

Now as the gametes fuse, both the n becomes 2n and diploid state is regained.

But if the meiosis don't occur in the gametes, the gametes will remain 2n. So after fertilization, it becomes 4n. This state is called tetraploidy.

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3 years ago

When did Cyanobacteria start producing pure oxygen

Travka [436]

<u>Answer:</u>

Cyanobacteria start producing pure oxygen around 200 million years ago.

<u>Explanation:</u>

Many scientists believed that Earth did not have any oxygen. Cyanobacteria or the blue green algae are the microbes which produced oxygen for the first time with the help of photosynthesis. This was around 4.5 billion years ago: after Hadean eon.

They were very simple, but they produced oxygen in the early earth’s atmosphere. So, they brought evolution on earth. This “blue-green algae” exists in salt water, rocks and soils and play a major role in maintaining the ecosystem.

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4 years ago

Read 2 more answers

kipiarov [429]

Answer:

Nitrogen

Explanation:

It can change in the Atmosphere or on land:)!

3 0

3 years ago

Name 3 critical areas of the body that are accurately maintained by homeostasis.

tester [92]

Answer: Respiratory system, Excretory system, and Endocrine system.

Explanation:

Homeostasis is the process through which several organ systems work to maintain a stable internal environment in the body. There are three organs of the body which ar eaccurately maintained by homeostasis:

Respiratory system: High carbon dioxide content in the blood triggers faster breathing. Most frequently, the lungs exhale, which quicker extracts carbon dioxide from the body.

Endocrine system: High blood sugar content causes insulin release by an endocrine gland called pancreas. Insulin is a hormone which helps the cells absorb blood sugar.

Excretory system: A low blood level of water causes kidney accumulation of water. The kidneys contain more concentrated urine, so less water from the body is lost.

Hence, three critical areas are respiratory system, excretory system, and endocrine system that are accurately maintained by homeostasis.

6 0

3 years ago