The two lines, one vertical and one horizontal, that divide the abdominopelvic area into quadrants cross at the
A) umbilicus/navel.
B) urinary bladder.
C) junction of the small and large intestines.
D) diaphragm.
E) sternum.
A) umbilicus/navel.
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________ open or close in response to binding specific molecules
A) Leak channels B) Activated channels C) Chemically gated channels D) Voltage-gated channels E) Voltage-gated and chemically gated channels
Which of the following would NOT be classified as a lymphoid organ?
A) Peyer's patches of the intestine B) pancreas C) spleen D) tonsils
________ are short-chain fatty acids in which five of the carbon atoms are joined in a ring
A) Cholesterol B) Estrogen C) Testosterone D) Prostaglandins E) Glycolipids
The structural explanation of how a muscle fiber contracts is called the
A) myosin spiral theory. B) thin filament theory. C) sliding filament theory. D) cross-bridge connection. E) active site rule.