The human immunodeficiency virus (HIV) that causes the disease known as aids selectively infects helper T cells (CD4+).
This retrovirus also infects macrophages and dendritic cells. When CD4+ T cell numbers decrease below a critical level (due to the killing of this cells with different mechanisms), cell-mediated immunity is lost. As a result, the body becomes progressively more susceptible to infections, leading to the development of AIDS.
<span> HIV can be transmitted only via body fluids like blood, semen, pre-seminal fluid, rectal fluids, vaginal fluids, and breast milk, which means that people usually get or transmit HIV through sexual behaviours and use of the needle. For HIV infection, these fluids must come in direct contact with a mucous membrane or damaged tissue. Another way is to be directly injected into the bloodstream (from a needle for example).</span>
The first one. Gametes are the reproductive cells: sperm and egg cells. These contain the info that is passed on to the offspring, so an inherited mutation must be present in the gametes.
Answer:
No, because the cougar can always find a food source in Florida.
Explanation:
Brainliest pls :)
Only the strongest live on to pass on their genes. the weak die
Answer:
The correct answer is: homeostasis.
Explanation:
Homeostasis is the state in which an organism maintains its internal conditions so it can function properly. If homeostasis fails, diseases appear.
In order to maintain homeostasis, there are many conditions that are regulated regularly, from <u>body temperature to pH, and fluid balance</u>. For homeostasis to be maintained, different systems participate in the regulation of these conditions.
The example provided in the question is a process performed by many structures in different organs that help regulate the concentration of fluids.
