What is the direct source of the heart sounds in a heart beat?
A) Contraction of ventricles
B) Rush of blood through the chambers
C) Blood turbulence resulting from valve closure
D) Electrical impulse between the SA and AV nodes
Answer: C
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Which is TRUE about the axon hillock of an axon?
A. Synapses far from the axon hillock are more effective in influencing whether an action potential will be generated in the axon than are synapses close to the axon hillock. B. It can only conduct graded potentials because it lacks voltage-gated Na+ channels. C. It is the region where neurotransmitter vesicles are docked and ready to be released by exocytosis. D. Its membrane potential at threshold is more negative than that of the cell body and dendrites. E. Its membrane potential at threshold is more positive than that of the cell body and dendrites.
Which of the labeled structures in the diagram is the coracoid process?
a) A b) B c) C d) D e) E
Which of the following brain waves has the highest frequency?
A. Theta B. Delta C. Beta D. Gamma E. Alpha
Vitamins and minerals are digested in the small intestine.
Answer the following statement true (T) or false (F)