Sci Questions! 5 stars and 10 points to best answer!!!?

Question

answer any of the fallin questions!

1.Explain how oxygen and carbon dioxide are exchanged in the lungs.

2. What is the difference between sexual and asexual reproduction? Describe how an egg is fertilized

3.How do vaccinations prevent certain diseases?

thanks a bunch!!!

hahaha noooooo im not doing my homework

lol no it reallly isnt my homework!

Answer 1

#3 You are injected with a dead virus. Your body thinks it's a live virus and builds up white corpuscles to attack the disease and defend itself. When the real disease does attack your body, your body has an Army of white corpuscles to attack and destroy the real disease. Hope that helps. It is what happens.

Answer 2

1. Carbon dioxide in your lungs, specifically in the alveolar spaces, is at a higher concentration in the red cell haemoglobin than in the air coming into the lungs. The CO2 then moves from high to low concentration, exchanging with oxygen. This means that oxygen moves fro the air to the haemoglobin. This is facilitated by an enzyme called carbonic anhydrase, which speeds up the exchange process about 1 million-fold.

2. Sexual reproduction requires both a male an female component, allowing for rearrangement of genes during fertilisation, mutations etc. Asexual requires only a single productive parent, generally classified as female, either as a budding process (plants), cell division (bacteria) or a form of cloning (insects such as aphids).

3. Vaccinations prevent disease by introducing the antigens without introducing the active disease. This is done by killing a virus, either my deactivation by heat, acid, alkaline etc, or by digesting parts of it with enzyme. While this destroys the ability of the virus to cause disease (it has to be intact for that) the proteins which make up the deactivated virus still are able to stimulate an immune response by specific lymphocytes (a type of white blood cell). These are so-called memory cells, which, when there is a subsequent exposure to the same virus, say, influenza, can generate an immediate response, because they already have the protein template available to create the specific antibodies toward the disease. This means that the severity is mild, with people considering that they are immune, whereas, they have actually caught the disease, but have recovered within hours or days, rather than weeks.

Answer 3

heres a basic overview i dont want to do ur homework for you lol

1.oxygen and co2 are exchanged via capillaries in you lungs
2,sexual reproduction requires a sperm and egg asexual doesnt. plants can reproduce asexually only some though and humans do sex.reproduction
3.vaccinations release the bacteria cells in your blood stream making you immune to a disease then when you are exposed to that disease your memory b cells will prevent you from actually getting that disease such as chicken pox which u usually get once

Answer 4

You don't happen to be in Keystone? Those are the same questions that I had to do for the Life Science course some lesson's exam. Of course that isn't homework. It's open ended exam questions.

Answer 5

haha r ppl doing ur hw?

smart kiddd