Both are B-cells but plasma cells are the B-cells which acted on the pathogen the first time they invade the body while the memory cells are the B-lymphocytes that act on the antigen(pathogen) the second time it invades and when ever it invades the body again.
Memory cells are much faster than plasma cells though plasma cells act very quickly on the pathogen once detected. but until it gets detected it needs time.
Memory cells will work as soon as the pathogen enters the body before the person could even feel the symptoms.
Answer: Due to accumulation of fat particles in the cytoplasm, the nucleus of the adipose cell moves towards the cell membrane giving a look alike ring. Thus adipose cells are also called signet ring cells.
Answer: Because cone cells are activated by light, that is why our pupils get smaller and larger, to let more or less light in, where as rod cells have no need for light, and are better for seeing in the dark, wich is a valueble abilaty when you are a pretator.
No. A sperm cell and an egg cell released from an ovary contain half the chromosomes as other cells until the sperm enters the egg cell and its chromosomes join that of the egg. At that point the egg cell becomes a new individual with a full complement of chromosomes. In humans a person gets 23 chromosomes from the mother and 23 from the father for a total of 46.
This answer is so wrong that it is funny....the ignorance of the person who answered it is really in question. BTW, Downs Syndrome is caused by a genetic defect of the subject having one extra chromosome.
The lower sperm counts or lower production of the Ova sometimes will effect the ability to have children
I believe that this is a repeat of a question,,,,it has been posted several times with nearly identical wording.
Answer: The lungs take in air. then lung capillaries, or small blood vessels, carry the blood to exchange carbon dioxide and oxygen. Then the heart pumps the oxygenated blood to the cells that need oxygen to break down sugar molecules.