Where are germinal centers located?
A. Thymus
B. Spleen
C. Lymphatics
D. Lymph nodes
E. Tonsils
D. Lymph nodes
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Basophils of the blood help to get defensive leukocytes to the site quickly by releasing an anticoagulant called ________ and a vasodilator called ________.
A. heparin; histamine B. bradykinin; histamine C. selectin; prostaglandin D. prostaglandins; selectin E. histamine; heparin
Which of the following is TRUE of veins?
A) Veins have smaller lumens than arteries. B) Veins have more elastic fibers than arteries. C) Veins have more smooth muscle than arteries. D) Veins have thinner walls than arteries.
Blood is pumped to the body during this part of the cardiac cycle
A) Atrial diastole B) Ventricular systole C) Ventricular diastole D) Atrial systole
Injury to the neurons of a collateral ganglion would affect the function of the
A) heart. B) pupils. C) sweat glands. D) digestive tract. E) arrector pili muscles.