Which of the following transport processes requires the energy of ATP to move substances across the plasma membrane?
A. Osmosis
B. Active transport
C. Diffusion
D. Filtration
E. Facilitated diffusion
Answer: B
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Describe a motor unit. How many fibers does a motor unit contain?
When blood starts to become too acidic, the kidneys respond by
A. synthesizing and secreting bicarbonate ions while reabsorbing H+. B. synthesizing and reabsorbing H+ while filtering bicarbonate ions. C. synthesizing and reabsorbing bicarbonate ions while secreting H+. D. decreasing filtration rate and increasing reabsorption of both bicarbonate ions and H+. E. increasing filtration rate and increasing reabsorption of H+.
Answer the following statements true (T) or false (F)
1. Digestion occurs in the organs in the digestive tract. 2. Metabolism occurs only in the organs of the digestive tract. 3. The alimentary canal and the gastrointestinal tract refer to the same thing. 4. The esophagus is a main organ of the digestive system. 5. The duodenum is an accessory structure of the digestive system.
Which of the following antagonistic hormones keep the blood calcium level balanced?
A. Parathyroid hormone and calcitonin B. FSH and LH C. Epinephrine and norepinephrine D. Aldosterone and cortisol E. ADH and OT