If oxygen is not available to a muscle cell, pyruvic acid is changed to ____ and builds up in the muscle cell
a. fatty acid
b. phosphocreatine
c. lactic acid
d. glucose
c
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Inborn or intrinsic reflexes are ________
A) involuntary, yet may be modified by learned behavior B) always mediated by the brain C) autonomic only D) rapid, predictable, and can be learned responses
Which of the following is NOT considered a lymphatic structure?
A) tonsils B) spleen C) pancreas D) Peyer's patches of the intestine
Which of the following is correct regarding enzymes?
A) They are made of lipids. B) They slow down cellular reactions. C) They are organic catalysts and are made of proteins. D) They bind to the active site of substrates. E) They are released during cellular injury.
The completion of a functioning placenta marks the beginning of the ________ period of development.
A. embryonic B. fetal C. pre-embryonic D. postnatal