Some adults with attention deficit hyperactivity disorder (ADHD) have abnormally low activity of the neurotransmitter involved in pleasure, attention, memory, sleep, movement, and learning, which increases their risk of drug abuse
Which drug are they most likely to abuse? A) cocaine
B) morphine
C) codeine
D) alcohol
A
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Describe the major roles of fungi that affect humans and their environment
What will be an ideal response?
A twitch is contraction and relaxation of
A. one neuron. B. one muscle cell. C. an entire muscle. D. one sarcomere. E. several muscles.
Each of the following statements about action potentials is true except
A) action potentials are propagated along a dendrite. B) action potentials require rapid changes in membrane potential. C) due to ion leaking, membranes may undergo subthreshold depolarization, which is insufficient to produce an action potential. D) action potentials end with a transient hyperpolarization. E) the action potential cycle has a refractory period.
Which of the following is the correct path sperm travel on their way out of the male?
A) Epididymis ? urethra ? vas deferens ? seminiferous tubules B) Seminiferous tubules ? epididymis ? vas deferens ? urethra C) Urethra ? vas deferens ? seminiferous tubules ? epididymis D) Epididymis ? seminiferous tubules ? vas deferens ? urethra E) Seminiferous tubules ? vas deferens ? urethra ? epididymis