The ultimate function of the circulatory system is accomplished by the heart
Indicate whether the statement is true or false
F
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Which of the following describes a function of cerebrospinal fluid?
1. Mechanical protection 2. pH homeostasis 3. Circulation a) 1 only b) 2 only c) 3 only d) Both 1 and 2 e) All of these choices
Nonessential amino acids:
a. are not used by the body b. can be made by the body from other substances c. are used only for catabolism d. are found only in plant proteins
The main location(s) for lymph nodes is _____. Select one:
a. axillary region b. cervical region c. inguinal region d. all choices
During the absolute refractory period which of the following is true?
A) The signal grows weaker with distance. B) It is possible to trigger a new action potential, but only with an unusually strong stimulus. C) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to threshold. D) If a neuron reaches threshold, the action potential goes to completion. E) No stimulus of any strength will trigger a new action potential.