Question: Answer the following question given this paragraph: 18.4 Leukocytes and Platelets Leukocytes function in body defenses. They squeeze out of the walls of blood vessels through emigration or diapedesis, then may move through tissue fluid or become attached to various organs where they fight against pathogenic organisms, diseased cells, or other threats to health. Granular leukocytes, which include neutrophils, eosinophils, and basophils, originate with myeloid stem cells, as do the agranular monocytes. The other agranular leukocytes, NK cells, B cells, and T cells, arise from the lymphoid stem cell line. The most abundant leukocytes are the neutrophils, which are first responders to infections, especially with bacteria. About 2030 percent of all leukocytes are lymphocytes, which are critical to the body's defense against specific threats. Leukemia and lymphoma are malignancies involving leukocytes. Platelets are fragments of cells known as megakaryocytes that dwell within the bone marrow. While many platelets are stored in the spleen, others enter the circulation and are essential for hemostasis; they also produce several growth factors important for repair and healing. Q: Which leukocytes are first to respond to bacterial infections? Choices: - chemocytes - erythrocytes - microcytes - neutrophils A:
Answer: neutrophils

Question: Answer the following question given this paragraph: Neurons are the structural and functional units of the nervous system. They consist of a cell body, dendrites, and axon. Q: What unit of the nervous system consists of a cell body, dendrites, and axon? Choices: - Transmitter - mitochondria - ganglion - neuron A:
Answer: neuron

Question: Answer the following question given this paragraph: With an occluded front , a warm air mass becomes trapped between two cold air masses. The warm air is lifted up above the cold air as in Figure below . Cloudy weather and precipitation along the front are typical. Q: When a warm air mass becomes trapped between two cold air masses, what type of front occurs? Choices: - storm front - obscured front - stationary front - occluded front A:
Answer:
occluded front