An action potential on a neuron develops when
a. threshold voltage is reached on an axon
b. voltage-gated Na+ channels open
c. spatial or temporal summation of graded potentials occurs to a great enough degree
d. the axon hillock reaches threshold voltage
e. any of the above events occur
E
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A combining form for "muscle" is:
A) ten/o B) fasci/o C) my/o D) ven/o
The ________________________________________ work to regulate the amounts of sodium, chloride, and potassium
Fill in the blank(s) with correct word
Which of the following is true?
A. Optimal actin and myosin overlap will produce maximal contraction. B. The greater the overlap of actin and myosin, the stronger the contraction. C. Overstretching a muscle will increase its tension. D. Tension is great when actin and myosin overlap as much as they can. E. The greatest amount of tension is achieved when actin and myosin do not overlap.
The lining of the intestine provides a physical barrier against microorganisms and their toxins.
Answer the following statement true (T) or false (F)