Neutrophils and the Immune System SAQ

Neutrophils play a role in acute bacterial infections and their numbers increase in response to such infections.

Eosinophils circulate in the bloodstream for 6-8 hours and their lifespan in connective tissues is 8-10 days.

Clinical conditions such as hay fever, urticaria (hives), chronic sinusitis, and some leukemias can cause an increase in basophil count.

<p>Monocytes are immediate precursors to cells of the monocyte-macrophage system and perform their functions outside the circulation by entering connective tissues to become macrophages or phagocytes.</p> Signup and view all the answers

<p>proerythroblast (Pr), basophilic erythroblast (BE), early polychromatophilic erythroblast (PE)</p> Signup and view all the answers

<p>arrows</p> Signup and view all the answers

<p>transporting O2 from lungs to tissues and returning CO2 from tissues to lungs for elimination</p> Signup and view all the answers

<p>120 days</p> Signup and view all the answers

<p>The cellular components of blood include red blood cells, white blood cells, and platelets. Red blood cells carry oxygen to the tissues, white blood cells help to fight off infections, and platelets are involved in blood clot formation and tissue repair.</p> Signup and view all the answers

<p>The function of blood is to transport oxygen and nutrients to the lungs and tissues, form blood clots to prevent blood loss, carry immune cells, and deliver waste products to the kidneys and liver for filtration and cleaning.</p> Signup and view all the answers

<p>Blood formation occurs in the bone marrow. During the first few weeks of gestation, it occurs in the yolk sac. Around 6 weeks of development, it shifts to the liver and spleen. Finally, from 6-7 months of fetal life onwards, it primarily occurs in the bone marrow.</p> Signup and view all the answers

<p>B cells produce and secrete antibodies, while T cells recognize invaders, activate the immune response, kill infected or abnormal cells, coordinate immune functions, and establish immunological memory.</p> Signup and view all the answers

<p>Heterochromatin is tightly packed form of DNA, while euchromatin is loosely packed form of DNA.</p> Signup and view all the answers

<p>Lymph nodes filter lymph and detect infections from peripheral tissues, returning interstitial fluid to circulation.</p> Signup and view all the answers

<p>HEVs allow for interactions between lymphocytes and endothelial cells, facilitating lymphocyte extravasation.</p> Signup and view all the answers