In order for local potentials to trigger an action potential, the membrane must reach a level called the ______
A. maximum potential
B. spike potential
C. threshold
D. resting membrane potential
C
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Through the process of cell differentiation,
A) cells in nearby locations become unable to work together. B) each cell develops a characteristic set of structural features. C) each cell becomes able to change its function throughout its life cycle. D) each cell becomes capable of performing all vital functions. E) None of the answers are correct.
What are the two major methods by which cells communicate to coordinate their functions?
A) positive feedback loops and negative feedback loops B) chemical messengers and/or electrical signals C) effectors and responses D) temperature gradients and pressure gradients
The azygos and hemizygos veins are a continuation of the right and left ascending lumbar veins.
Answer the following statement true (T) or false (F)
The erectile tissue that surrounds the urethra is the
A) membranous urethra. B) penile urethra. C) glans penis. D) corpus spongiosum. E) corpus cavernosum.