During organogenesis, which structure is not derived from the pharyngeal pouches?
A. Palatine tonsil
B. Thymus
C. Vertebra
D. Thyroid gland
E. Middle ear cavity
C. Vertebra
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A series of local potentials causes the membrane potential to move to -80 mV. Predict the result
A. threshold is reached B. depolarization occurs C. the neuron is hyperpolarized D. information of frequency is needed to predict the result E. the neuron releases neurotransmitter in response
An animal can increase its risk of contracting a pathogen as a result of
A) A cut in the skin. B) A decrease in secretion of mucus. C) Interactions with symbiotic organisms. D) A and B
Identify the adrenal gland in the following figure
A) A B) B C) C D) D
If a neurotransmitter binds to receptor molecules that open K+ ion channels, the result is
A) an excitatory postsynaptic potential (EPSP). B) an inhibitory postsynaptic potential (IPSP). C) no change. D) all of the above