When a section of the resting neuron is stimulated:
a. sodium ions rush into the cell
b. sodium ions rush out of the cell
c. the interior of the cell becomes slightly positive
d. both A and C above
d. both A and C above
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Neuron X makes inhibitory axon-axonal synaptic contact with neuron Y at the synapse of Y and neuron Z. Which will occur when action potentials are stimulated in neuron X?
A. The synapse between neurons Y and Z will be changed from an excitatory synapse to an inhibitory one. B. Neuron Y will be inhibited from reaching the threshold to fire an action potential. C. Neurons Y and Z will both be less likely to reach threshold and fire an action potential. D. The release of neurotransmitter by neuron Y will be inhibited. E. Neurons Y and Z will both be more likely to reach threshold and fire an action potential.
Antibodies bind to antigens to destroy them.
Answer the following statement true (T) or false (F)
Match the following cavities and organs:
A) Thoracic B) Abdominopelvic C) Cranial 1) Stomach 2) Heart 3) Uterus 4) Brain 5) Lungs
Which cells recognize and destroy tumors in a non-specific fashion, without requiring prior exposure to antigens?
A. Plasma cells B. Natural killer cells C. Macrophages D. Dendrocytes E. B cells