Which region of the digestive tract moves material by peristalsis, haustral churning, and mass movement?
A. Pharynx
B. Stomach
C. Esophagus
D. Large intestine
E. Small intestine
Answer: D
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Why is there variation in skin color among modern humans?
A. People have different numbers of melanocytes. B. People have a different distribution of carotene in their skin. C. People have a different distribution of melanin in their epidermis. D. People are exposed to different chemicals over their lifetime. E. People have different hemoglobin in vessels close to their skin.
countercurrent exchange system
Fill in the blank(s) with the appropriate word(s).
Approximately how much blood is pumped from each ventricle during the ventricular ejection phase?
What will be an ideal response?
If demyelination occurs, why don't action potentials occur at regions of the axon that were previously myelinated?
What will be an ideal response?