Which neurotransmitter is released from a motor neuron at the neuromuscular junction?
A. acetylcholine
B. GABA
C. ephinephrine
D. dopamine
E. serotonin
A. acetylcholine
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Which of the following statements about action potentials is false?
A) Electrical signals are propagated along a dendrite. B) They require rapid changes in membrane potential. C) Due to leaking, membranes are subject to subthreshold depolarization, which is insufficient to produce the action potential. D) At the end of the action potential, most neurons show a transient hyperpolarization. E) A refractory period is always necessary following an action potential.
Fever
A) is a type of specific immunity. B) is caused only by endogenous pyrogens. C) increases the rapidity of the host immune responses. D) increases the viability of many microbial invaders.
The "hardwired" or inherited set response patterns that are described for a male cheetah spraying a pheromone to mark its territory, a bee performing a waggle dance, or a cricket singing to sort out mates, are
A. altruistic adaptations to improve the general environment. B. symbol systems. C. inherited systems that are evolutionarily adaptive. D. languages similar to human languages in variability and learning requirements. E. the sociobiological roots of our language system.
Electrons from ___ replace those lost in photosystem II
What will be an ideal response?