Question

*Biology Help Please*
(3 Questions)

What happens to the immune system of a person with HIV, and how may that infection develop into AIDS?
What are some ways in which plants defend themselves from herbivores? Describe two physical defenses and two chemical defenses.
Describe how the nervous system helps different parts of your body communicate with one another the moment you begin to pet a dog.

Answer 1

The HIV virus destroys white blood cells, grows enormous, and then attacks red blood cells as it spreads through the victim's immune system, damaging the body and eventually leading to AIDS.
Plants have evolved a variety of herbivore defenses, ranging from complex to basic. Coconut palms and many oak nut trees protect their roots by enclosing them in woody or tough tissue that is difficult to penetrate. Thorns and ridges are examples of physical defenses. They evolved as a defense against herbivores in many classes. Chemical defenses may be constitutive or convinced, which means they develop or strengthen when the plant detects a herbivore. Many components, such as the lubricants that produce heat or the sour-tasting tannin found in several plant families, have a strong flavor.
Your hand movement sends messages to your brain, telling you what you want to do and directing you in doing that.

Answer 2

did you jus answer your own question?

Answer 3

lmaoooo

Answer 4

lol yeah fax

Answer 5

lol ight

Answer 6

so good job answering your own question lol

Answer 7

1A) HIV kills immune system cells that help the body fight infections and diseases. The immune system becomes weak when it cannot make enough CD4 cells to fight HIV.

1B) HIV finds the white blood cells, called CD4 cells. HIV gets inside the CD4 cell and makes copies of itself. Then, HIV kills the CD4 cell and the new HIV copies find other CD4 cells to get inside and start the cycle again. HIV kills immune system cells that help the body fight infections and diseases.

2) The first line of defense in plants is an intact and impenetrable barrier composed of bark and a waxy cuticle. Both protect plants against herbivores. Other adaptations against herbivores include hard shells, thorns (modified branches), and spines (modified leaves).

3) When you pet a dog, mechanoreceptors in the skin of your hand are activated, sending a signal down a sensory neuron that connects to your spinal cord, through to your brain. ... The brain then sends a signal back to the muscles in your hand, making you continue petting the dog and receive more pleasure from the process.

Answer 8

Do you still need help with this post?

Answer 9

this is the most chill and productive chat ive seen

Answer 10

Do you need help still lol?