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2 years ago

In humans, the maintenance of a stable internal temperature is a direct result of___________.

Biology

1 answer:

vampirchik [111]2 years ago

8 0

The given question is incomplete. The complete question is:

In humans, the maintenance of a stable internal temperature is a direct result of___________.

a. detection of and reaction to stimuli in the environment

b. digestion of starches and absorption of protein from the internal environment

c. diffusion of water and excretion of glucose to the external environment

d. transport of ATP and locomotion through the environment

Answer:

a. detection of and reaction to stimuli in the environment

Explanation:

Thermoreceptors present in skin layers of the human body sense the deviation of the body temperature from the normal range. As the body temperature rises above normal, the thermoreceptors send signals to the brain which n turn signals dermal blood vessels to dilate and sweat glands to secrete sweat. The heat from the body surface is lost to the surroundings to drop the body temperature towards the normal range.

On the other hand, when the body temperature goes below the normal range, thermoreceptors send signals to the brain which in turn signals dermal blood vessels to constrict to conserve the body heat. If body temperature continues to drop, muscles are signaled to contract involuntarily to generate body heat to raise the body temperature towards the normal range.

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The diagram below shows some of the steps in protein synthesis.

Zinaida [17]

Answer:

According to the diagram shown, the section of DNA used to make the mRNA strand is known as a gene (option 2).

Explanation:

Gene consists of a DNA fragment that codes for the synthesis of a specific protein that defines the structural or functional trait of a living being.

When DNA is transcribed into mRNA, each section of transcribed DNA is part of a gene. The information travels to ribosomes in the cytoplasm where protein synthesis occurs.

A complete DNA molecule forms a chromosome, which contains the genes with information to define specific traits of a species.

The other options are not correct because:

1.Carbohydrate is a biomolecule that is not involved in the genetic process.

3. Ribosome is where protein synthesis occurs.

4. Chromosome is the complete DNA molecule.

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2 years ago

Scientists have conducted multiple experiments on cancer cells to determine how they reproduce. All studies have shown the same

Sonbull [250]

Cancer cells reproduce the same way the other cells reproduce. The difference between cancer cells and others is that their reproduction is uncontrollable. They constantly go through the cell cycle and they reproduce. Two ways cell reproductions are meiosis and mitosis. DNA duplicates itself. Cancer is incessantly receiving messages.

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3 years ago

Read 2 more answers

What is the definition of a dominant trait?

ki77a [65]

dominant trait is opposed to a recessive trait which is expressed only when two copies of the gene are present.

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2 years ago

The school district wanted to determine whether the more expensive floor wax (Brand A) was better than the cheaper (Brand X) flo

erik [133]

Answer:

please help me on my question

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2 years ago

Correctly identify each of these definitions or examples as either depolarization or hyperpolarization of the plasma membrane. 1

natulia [17]

Answer:

hyperpolarization
depolarization
hyperpolarization
depolarization
hyperpolarization
depolarization
depolarization

Explanation:

The resting membrane potential is balanced by ion leakage and ion pumping, to get an electrical signal started the membrane potential has to lose its balance. This starts with a membrane channel opening for Na+ since Na+ concentration is higher outside the cell, ions will rush into the cell. This will change the relative voltage inside the cell. The resting potential has a voltage of -70 mV, the sodium cation entering the cell cause it to become less negative. This is known as depolarization.

The concentration gradient for Na+ will continue to enter the cell making the voltage to become positive reaching +30 mV. At the same time, this happens, other voltage-gated channels are also opening, a concentration gradient acts on K+, as well, as it leaves the cell, it takes a positive charge with it making the membrane potential to move back to its resting voltage of -70 mV. This is called repolarization.

For potassium ions to reach equilibrium the membrane voltage needs to be below -70 mV, this leads to a period of hyperpolarization that occurs while the K+ channels are open.

I annexed an image that illustrates this action potential process.

Considering the information given during depolarization there's an increase in the number of sodium leak channels (7) making the inside of the cell more positive (2) increase in the membrane potential (4), this also implies a decrease in the extracellular concentration of potassium (6)

Meanwhile, during hyperpolarization an increase in the extracellular concentration of potassium (3) decreases the membrane potential (1) making the inside of the cell more negative (5).

I hope you find this information useful and interesting! Good luck!

4 0

2 years ago