The hormone called _________ plays an important role in synchronizing physiological function with the cycle of daylight and darkness.
A. calcitonin
B. melanin
C. melatonin
D. hepcidin
E. inhibin
C. melatonin
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Which of the following extrinsic eye muscles is responsible for the eye looking down?
A) lateral rectus B) inferior oblique C) inferior rectus D) medial rectus E) superior rectus
This figure shows a frontal section of the kidney. Which number indicates the renal pelvis?
A. 1 B. 2 C. 4 D. 8 E. 9
An atom has an atomic number of 19 and a mass number of 39. This atom will have ________ neutrons.
A. 20 B. 58 C. 39 D. 19
Neostigmine, used to treat myasthenia gravis, blocks the enzyme that degrades ________. This helps treat the disease because ________.
A. nicotine; it destroys the antibodies that block nicotinic ACh receptors on the motor end plate B. acetylcholine; it destroys the antibodies that block nicotinic ACh receptors on the motor end plate C. acetylcholine; it increases the amount of acetylcholine available to bind to receptors on the motor end plate D. norepinephrine; it increases the amount of acetylcholine available to bind to receptors on the motor end plate