What was the first antibiotic, discovered as a result of a laboratory accident?
What will be an ideal response?
penicillin
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In lactation, milk production is stimulated by _____, while milk release is stimulated by _________.
A. oxytocin, prolactin B. progesterone, oxytocin C. prolactin, oxytocin D. prostaglandin, oxytocin E. progesterone, prolactin
The hormone that controls the concentration of urine is:
a. insulin b. glucagon c. antidiuretic hormone d. thyroxine e. epinephrine
Secretory IgA antibodies are unique because they
A. have unique light chains. B. are Y-shaped molecules. C. are present in the plasma. D. are connected with J chains and short polypeptides to form dimers. E. are present in lymph nodes.
Which of the following organ systems is responsible for eliminating metabolic wastes from the body?
a. excretory system b. respiratory system c. nervous system d. excretory and respiratory system e. excretory, respiratory, and circulatory system