The fundamental units of all plant and animal tissues are ________.
Fill in the blank(s) with the appropriate word(s).
cells
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Which of the following is the leading cause of death in the world, causing 16.4 million deaths in 2001?
All exchanges between mother and embryo occur ________
A) as maternal and fetal blood mix in the placenta B) across the chorionic membranes C) through the amniotic fluid D) through the allantois
Blood in the heart chambers provides most of the myocardium's oxygen and nutrient needs.
Answer the following statement true (T) or false (F)
Which statement correctly describes what happens during expiration?
A. The external intercostal, pectoralis minor, and sternocleidomastoid muscles contract to expand the rib cage and the diaphragm contracts to flatten its dome shape. B. The external intercostal and sternocleidomastoid muscles relax to expand the rib cage and the diaphragm relaxes to return to its dome shape. C. The external intercostal, pectoralis minor, and sternocleidomastoid muscles relax allowing the rib cage to return to its unexpanded size and the diaphragm relaxes to return to its dome shape. D. The external intercostal, pectoralis minor, and sternocleidomastoid muscles contract to expand the rib cage and the diaphragm relaxes to return to its dome shape.