A neurotransmitter binds chemically gated ion channels on the postsynaptic cell, causing a depolarization. Functionally, this neurotransmitter can be classified as excitatory.
Answer the following statement true (T) or false (F)
True
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One function of helper T-lymphocytes is to enhance the activity of cells of the innate immune system
Indicate whether this statement is true or false.
Which statement is not true?
A. During ventricular systole, the pulmonary semilunar valve is open. B. During ventricular systole, the atria are filling with blood. C. During ventricular systole, the bicuspid valve is open. D. During ventricular systole, the aortic semilunar valve is open. E. During ventricular systole, the tricuspid valve is closed.
Moving the arm in a circle around the shoulder joint is:
a. flexion b. rotation c. abduction d. extension e. adduction f. circumduction
To pick up something heavier than your pencil, your nervous system could
a. stimulate larger motor units b. decrease the frequency of stimulation to allow a more prolonged contraction to occur c. decrease the refractory periods d. block acetylcholinesterase at the neuromuscular junction to allow acetylcholine to function longer e. do all of the above