If two similar molecules can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other
Indicate whether the statement is true or false
T
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Which of the following events in the male sex act occurs last and results in ejaculation?
A. peristaltic contractions of the ductus deferens B. contractions of skeletal muscle at the base of the penis C. constriction of the internal sphincter of the urinary bladder D. release of secretions from the seminal vesicles and the prostate gland E. semen accumulates in the prostatic urethra
Which lymphatic organs are smaller in an adult compared to a child?
A. Spleen and red bone marrow B. Thymus and spleen C. Peyer patches and spleen D. Red bone marrow and thymus E. Tonsils and spleen
Intercalated discs are made up of gap junctions and ________.
Fill in the blank(s) with the appropriate word(s).
The figure illustrates the autonomic reflexes and the heart. What does "A" represent?
A. sympathetic nerve B. increase in blood pressure detected by carotid baroreceptors C. glossopharyngeal nerve D. decrease in blood pressure detected by carotid baroreceptors E. vagus nerve