lymphocytes originate from hemocytoblasts in red bone marrow, like all blodd cells....true or false?

Answer 1

true

Answer 2

Lymphocytes "are small cells, 7-9 µm in diameter in blood smears ...

second most common white blood cell type, comprising about 30 % of the leukocyte population in peripheral blood....

Lymphocytes travel in the blood, but they routinely leave capillaries and wander through connective tissue. Therefore, lymphocytes may be normally encountered at any time in any location. They even enter epithelial tissue, crawling between the epithelial cells. They reenter circulation via lymphatic system channels (hence their name)."

Source: Blood Cells - http://www.siumed.edu

Life cycle of lymphocytes:
Develop in the thymus gland or bone marrow.


B-cells grow (differentiate) and mature in the bone marrow.


T-cells also start out in the bone marrow. They differentiate and mature in the thymus gland (beneath breastbone).


B-cell and T-cell lymphocytes are distributed through the blood stream, which eventually branches into tiny blood vessels called capillaries.


Some lymphocytes migrate to capillaries into surrounding tissues. Some enter lymphatic vessels-tiny, blind-ended tubes-and lead to larger lymphatic ducts and branches.


Along the way, the fluid passes through lymph nodes, oval structures composed of lymph vessels, connective tissue, and white blood cells. Here, the lymphocytes either are filtered out or are added to the contents of the node.

Answer 3

Unfortunately, I was not gaseous when I performed my scientific experiment; however, I did find that the body can react in two different ways when sucking hard: 1) The abdominals are pulled in when sucking and therefore resulting in the anal sphincter actually pulling inward which does not lend itself to the expulsion of gaseous fumes (unfortunate that this is prolly the maneuver used by those pesky bean-eating vegan types); 2) The hard sucking action causes extension of the abdominals resulting in the protrusion of the anal sphincter and the resulting gaseous explosion. My conclusion: With practice and abdominal control one can choose to hold it in and take the pain or let it out and bear the shame. The loudness of the fart largely depends on the commitment of the fartee.

Answer 4

this is true