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natka813 [3]
3 years ago
6

Wht is the orbital radius in kilometers

Biology
1 answer:
Svetradugi [14.3K]3 years ago
7 0
1,500,000 kilometers.

The Hill sphere (gravitational sphere of influence) of the Earth is about 1,500,000 kilometers (0.01 AU) in radius, or approximately four times the average distance to the Moon. This is the maximal distance at which the Earth's gravitational influence is stronger than the more distant Sun and planets.
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What does the immune system protect the body against?
Rudik [331]
The immune system protects your child's body from outside invaders, such as bacteria, viruses, fungi, and toxins (chemicals produced by microbes). It is made up of different organs, cells, and proteins that work together.

Anatomy of the immune system

There are two main parts of the immune system:

The innate immune system, which you are born with.

The adaptive immune system, which you develop when your body is exposed to microbes or chemicals released by microbes.

These two immune systems work together.

The innate immune system

This is your child's rapid response system. It patrols your child’s body and is the first to respond when it finds an invader. The innate immune system is inherited and is active from the moment your child is born. When this system recognizes an invader, it goes into action immediately. The cells of this immune system surround and engulf the invader. The invader is killed inside the immune system cells. These cells are called phagocytes.

The acquired immune system

The acquired immune system, with help from the innate system, produces cells (antibodies) to protect your body from a specific invader. These antibodies are developed by cells called B lymphocytes after the body has been exposed to the invader. The antibodies stay in your child's body. It can take several days for antibodies to develop. But after the first exposure, the immune system will recognize the invader and defend against it. The acquired immune system changes throughout your child's life. Immunizations train your child's immune system to make antibodies to protect him or her from harmful diseases.

The cells of both parts of the immune system are made in various organs of the body, including:

Adenoids. Two glands located at the back of the nasal passage.

Bone marrow. The soft, spongy tissue found in bone cavities.

Lymph nodes. Small organs shaped like beans, which are located throughout the body and connect via the lymphatic vessels.

Lymphatic vessels. A network of channels throughout the body that carries lymphocytes to the lymphoid organs and bloodstream.

Peyer's patches. Lymphoid tissue in the small intestine.

Spleen. A fist-sized organ located in the abdominal cavity.

Thymus. Two lobes that join in front of the trachea behind the breastbone.

Tonsils. Two oval masses in the back of the throat.

How do antibiotics help fight infections?

Antibiotics can be used to help your child's immune system fight infections by bacteria. However, antibiotics don’t work for infections caused by viruses. Antibiotics were developed to kill or disable specific bacteria. That means that an antibiotic that works for a skin infection may not work to cure diarrhea caused by bacteria. Using antibiotics for viral infections or using the wrong antibiotic to treat a bacterial infection can help bacteria become resistant to the antibiotic so it won't work as well in the future. It is important that antibiotics are taken as prescribed and for the right amount of time. If antibiotics are stopped early, the bacteria may develop a resistance to the antibiotics and the infection may come back again.

Note: Most colds and acute bronchitis infections will not respond to antibiotics. You can help decrease the spread of more aggressive bacteria by not asking your child’s healthcare provider for antibiotics in these
4 0
2 years ago
How many bases are there on each rung of the DNA ladder?
RSB [31]
Their are four bases
6 0
3 years ago
Read 2 more answers
Jerome puts two magnetic vehicles very close to each other. what will happen next, and why?
vekshin1
The magnetic vehicles will move closer to each other because the magnetic force will pull the vehicles together.
8 0
3 years ago
An engineer wants to build a house on a beach. Buildings on the shore must be built high enough to avoid flooding from oceans du
grin007 [14]

Answer:

Answer B

Explanation:

Because i got it correct

5 0
3 years ago
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According to the phylogeny tree, which two phyla are most closely related? Chordata and Mollusca Cnidaria and Nematoda Annelida
devlian [24]
<h2>Answer:</h2>

Option C is correct.

C. Annelida and Arthropoda

<h2>Explanation:</h2>

Annelida and Arthropoda are the phyla belong to the kingdom Animalia. In these both phylum animals are consist of segmented bodies. But the animals in Annelida consists of a hydrostatic skeleton whereas the animals in Arthropoda consist of exoskeleton made up of chitin.


6 0
3 years ago
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