What painkilling and mood enhancing compounds are released during prolonged exercise, such as jogging?
a. endorphins
b. enkephalins
c. dynorphins
d. substance P
e. alcohols
a
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Vision is one of the special senses, because its receptors are found within complex sensory organs in the head.
Answer the following statement true (T) or false (F)
With damage to nerve fibers, larger distances between the site of damage and the target structure innervated result in _________ chances of successful regeneration
A. increased B. decreased
Excitation-contraction coupling is the
A) sliding of thin filaments past thick filaments during muscle fiber contraction. B) refractory period of an action potential. C) threshold period of an action potential. D) sequence of processes that links the action potential to contraction. E) transfer of ACh into the synaptic cleft.
Hemophilia, color blindness, and Duchenne muscular dystrophy occur more often in males than females. Why?
A) These diseases develop due to the lack of estrogen and progesterone. B) Since there is no matching gene on the Y chromosome, the traits are expressed more readily in males. C) Testis-determining factor (TDF) causes these diseases. D) These traits are carried only on the X chromosome and since there is no matching gene on the Y chromosome, the traits are expressed more readily in males. E) These traits are carried only on the X chromosome.