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Ksenya-84 [330]
3 years ago
6

Which cells of the nervous system protect the cns by phagocytosing viruses, microorganisms, and tumor cells?

Biology
1 answer:
alexandr402 [8]3 years ago
3 0
The correct answer is microglia.
<span>Microglia is glial cells found in the central nervous system with the protective role. Because they are the resident macrophage cells, they act as the first and main form of active immune defense. Microglia is constantly cleaning the CNS for plaques, damaged or unnecessary neurons, and infectious agents, like viruses or other microorganisms.</span>
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An injection is administered through the skin using a hypodermic needle. Identify the first integumentary structure through whic
Phantasy [73]

Answer:

correct Answer: E   Which of the following lists the layers of the epidermis in thick skin in the correct order from deep to superficial? correct Answer: Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum   Match the following epidermal cell type with its function: Melanocytes.

Explanation:

5 0
3 years ago
Which contraceptive method is 100 percent effective at preventing pregnancy?
emmainna [20.7K]

The correct answer is D. Abstinence

Explanation:

A contraceptive method or birth control method refers to a method used to avoid pregnancy or reduce the probability of getting pregnant. From antiquity, there have been different contraceptive methods but only in the last decades, methods have been designed based on science and its effectiveness has been studied.

Because of this, nowadays there are many contraceptive methods such as pills, condom, and implants that are about 80% to 95% effective, sterilization that is a around 98% effective and natural methods that have a lower percentage of effectiveness. But the only method that has been proven as completely effective or 100% effective is abstinence because by avoiding any type of sexual intercourse it is virtually impossible an egg can be fertilized by a spermatozoid.

7 0
3 years ago
Cystic fibrosis is genetic, meaning it can be
vaieri [72.5K]

Answer:

Deletion.

Explanation:

Cystic Fibrosis is caused by a Deletion Mutation in Chromosome 7. It is a recessive disorder that is hereditary.

6 0
3 years ago
A positive feedback loop, where the product signals for the production of more reactant, is maintained homeostasis.
OleMash [197]

False

Homeostasis is defined as the process of resisting change in order to maintain a stable environment. It typically involves negative feedback loops as these loops prohibits the change to occur in the human body system and maintain a constant internal environment. While positive feedback is the process of amplifying the stimulus produced within the body.

Homeostasis is thus regulated by negative feedback loops and rearely regulated by the positive feedback loops.


6 0
3 years ago
In eastern gray squirrels, Sciurus carolinensis, the allele for black fur (B) is dominant to the allele for gray fur (b) . In a
DedPeter [7]

Answer:

The answer to the given question is C.

Explanation:

Natural selection:

The population contains both superior as well as inferior organisms where natural resources are limiting so it will cause competition between organisms. As a result of competition, it will select superiors, and inferiors are deleted and they are given reproductive advantages. Due to this reproductive advantage new population emerges. It is more suitable for the environment.  

Natural selection divides into three parts that are directional, disruptive, and stabilizing selection.  

This is an example of natural selection. Environmental conditions create pressure on the individuals and if they can survive and become fittest, their number increases in the population. This is according to Darwin's theory in the struggle for existence. These organisms survived as the fittest organisms to match climatic conditions.

Stabilizing selection: This operates when features coincide with the optimal environmental conditions and the organisms survive in a population. Stabilizing selection pressures do not promote evolutionary change but tend to maintain stability within the population from generation to generation.  

In the beginning, directional selection - the organism develops characters to survive in response to gradual changes in the environmental conditions. It works on a range of phenotypes existing within a population and exerts selection pressure which moves the mean phenotype to one phenotypic extreme. When the mean phenotype overlaps with the new optimum environmental conditions, stabilizing selection will take over.  

7 0
3 years ago
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