Answer:
It is thin tissue that lines the alveoli
Hope this helps.
Answer:
The correct answer is D) short-lived plasma cells that secrete antibodies for the antigen
Explanation:
Each B lymphocyte has an antigen receptor (BCR: B cell receptor), a surface immunoglobulin (IgM or IgD), that binds to specific domains of the antigen called antigenic determinants or epitopes. Only B lymphocytes with a high antibody affinity for the antigen, and which are capable of processing and presenting it, will be positively selected. In this contact between the two cells, an exchange of chemical signals takes place that leads to the activation, clonal proliferation and differentiation of B cells into two sister subclones: one of antibody-secreting plasma cells, and the other of memory primed B cells. Therefore, only these last positively selected B lymphocytes will survive, proliferate and differentiate into plasma cells, synthesizing and secreting antibodies of a single isotypic class, with a unique specificity and high affinity, improving the ability to adhere to the antigen and, thus , neutralize and destroy pathogens.
Explanation:
food chain shows only one possible feeding pathway while food web shows numerous feeding pathway
The answer is 250 miles per hour.
To communicate, neurons send impulses to other neurons or muscle cells. Depending on the nature of information needed to be sent, some impulses are faster than the other. For example, if a person burns its hand, the information must be quickly sent to the central nervous system for quick reaction. Some impulses can achieve 250 miles per hour. But, for this, axon must be well insulated and very thick.
