In order to regulate the pH of extracellular fluid, the kidneys are able to adjust the excretion of:
A. hydrogen ions.
B. calcium.
C. sodium.
D. magnesium.
E. potassium.
A
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Why are there so many phagocytic cells (in lymph nodes and the liver, for example) associated with the digestive system?
A. They stimulate contractions of the tunica muscularis. B. They stimulate proliferation of stem cells. C. They remove bacteria and other foreign material ingested with food. D. They can transform into other cell types under the appropriate hormonal stimulation. E. They stimulate digestive enzyme production.
Collagen is best described as a(n)
A) Intracellular matrix protein. B) Extracellular matrix protein and one of the earliest innovations observed in animals. C) Matrix protein that all animals have, with the exception of sponges. D) Intracellular matrix that is a basis for communication between cells.
The smooth muscle of the digestive viscera is served largely by the ________.
A) lumbar splanchnic nerves B) cephalic plexus C) pelvic nerves D) tenth cranial nerve
Which bone is not paired?
A. Zygomatic B. Nasal C. Maxilla D. Lacrimal E. Mandible