The pacemaker of the heart is the
a. Purkinje fibers.
b. the bundle branches.
c. Bundle of His.
d. AV node.
e. SA node.
Ans: e. SA node.
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Which of the following is not involved in the regulation of gastric activity?
A) submucosal neural plexus B) myenteric plexus C) vagus nerve D) CNS E) hypoglossal nerve
Your skin, after it is exposed to sunlight, will produce which vitamin?
A. Vitamin A B. Vitamin B C. Vitamin C D. Vitamin D
Birds derive seminal fluid from the
a. seminiferous tubules. b. vasa efferentia. c. vas deferens. d. seminiferous tubules and vasa efferentia. e. seminiferous tubules and vas deferens.
If all else remains equal, an increase in the difference between atmospheric and alveolar pressure results in an increase in airflow.
Answer the following statement true (T) or false (F)