Correct Answers! (Graded A+)
D - Which of the following is an example of a polypetide hormone?
A. epinephrine
B. cortisol
C. thyroid hormone
D. insulin
E. all of the above
D - Which of the following hormone categories has the longest half life?
A. uranium
B. catecolamine
C. peptide
D. steroid
E. none of the above
C - The hormone oxytocin is produced by cells in the hypothalamus and released by THIS PART of the
pituitary gland in response to the brain recording nervous stimulation of an infant suckling a nipple.
A. anterior pituitary
B. adenohyposis
C. posterior pituitary
D. pineal
C - By now, if you have not been to class in a while, you are experiencing the mammalian stress
response. Which of the following is NOT excited by the presence of epinephrine during the
mammalian stress response ?
A. ventilation rate
B. heart rate
C. action of insulin
D. vasoconstriction of skin capillaries
D - In resting skeletal muscle, contraction does not occur because
, A. there is very little ATP in the cytoplasm
B. most of the ATP is bound to other molecules for storage
C. there is very little myosin in the cell.
D. there is very little calcium in the cytoplasm
E. myosin is inactivated by a kinase
B - When the cell membrane of a vertebrate skeletal muscle is depolarized, ryanodine receptors
(RYR) change configuration and permit passage of calcium
A. passively from the extracellular fluid to the cytoplasm
B. passively from the sarcoplasmic reticulum to the cytoplasm
C. actively from the extracellular fluid to the cytoplasm.
D. actively from the sarcoplasmic reticulum to the cytoplasm.
E. actively from the cytoplasm to the sarcoplasmic reticulum.
B - The diffusion rate of which factor best explains why vertebrates evolved to have slow oxidative
muscle fibers that are smaller in diameter than fast glycolytic fibers?
A. lipid
B. oxygen
C. calcuim
D. lactic acid
E. glucose
C - A vertebrate motor unit consists of
A. all of the muscles that contract to complete a particular body movement
B. a particular muscle and all of its synergistic and antagonistic muscles
C. a single motor neuron and all of the muscle fibers that it innervates
D. all of the fibers of a particular fiber type in a given muscle
E - Endurance exercise involves
A. few repetitions of movements involving high force and anaerobic metabolism
B. few repetitions of movements involving low force and aerobic metabolism
C. few repetitions of movements involving high force and aerobic metabolism