An electrical impulse starting at the SA node passes through the conducting-system structures in the following order _______.
A. bundle of His>AV node>Purkinje fibers
B. AV node>Purkinje fibers>bundle of His
C. Purkinje fibers>AV node>bundle of His
D. AV node>bundle of His>Purkinje fibers
Ans: D. AV node>bundle of His>Purkinje fibers
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Answer the following statement true (T) or false (F)
Respiratory control centers are located in the ________.
A) midbrain and medulla B) medulla and pons C) pons and midbrain D) upper spinal cord and medulla
The ________ performs the work of the heart.
A. pericardial cavity B. endocardium C. epicardium D. myocardium E. fibrous skeleton
Sperm cells get energy to power their movement from ________, which is contributed by the ________.
A. sucrose; bulbourethral gland B. semen; seminiferous gland C. fructose; seminal vesicles D. seminogelin; prostate E. prostaglandins; prostate