Which of the following events occurs first?
A. threshold
B. depolarization
C. early repolarization
D. final repolarization
E. pacemaker potential
E
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Which of the following statements is true regarding the yolk sac in human embryos?
A. It gives rise to the digestive tract. B. It is the source of the first blood cells. C. It allows for gas exchange. D. It allows for the passage of waste. E. It is the major source of nutrients for the embryo.
Which of the following is found in orbitals surrounding the nucleus of the atom?
a. proton b. neutron c. electron d. both proton and neutron
Which of the following is not a function associated with the spinal cord?
A. To conduct motor information down the cord B. To conduct sensory information up to the brain C. To coordinate the alternating contraction of several muscle groups associated with locomotion D. To protect neurons in both the ascending and descending tracts E. To mediate a reflex, such as the withdrawal of a hand from pain
In a metabolic pathway, the same enzyme ordinarily catalyzes several different reactions
Indicate whether the statement is true or false.