The heartbeat is initiated by the cardiac muscle fibers of the ________ node.
Fill in the blank(s) with the appropriate word(s).
sinoatrial
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What is the function of Peyer's patches?
A. Guard against pathogens entering the body through the nose or mouth. B. Fight any bacteria moving into the small intestine from the colon. C. Remove anything that may be potentially harmful in lymph. D. Stand guard against and fight any pathogens trying to enter the body.
Which of the following are cells of the alveoli that produce surfactant?
a) Type I alveolar cells b) Type II alveolar cells c) Type III alveolar cells d) Surface cells e) Macrophages
Skin wrinkle and sagging is caused by
A) UV radiation. B) hormonal changes. C) aging. D) all of the choices. E) none of the choices.
When viewing a centrifuged blood sample, the erythrocytes will be on the top.
Answer the following statement true (T) or false (F)